Turn to java

HMCL/src/main/kotlin/org/jackhuang/hmcl/Main.kt

@@ -22,11 +22,13 @@ import javafx.application.Platform
 import javafx.stage.Stage
 import org.jackhuang.hmcl.setting.Settings
 import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.Schedulers
 import org.jackhuang.hmcl.ui.Controllers
 import org.jackhuang.hmcl.ui.runOnUiThread
-import org.jackhuang.hmcl.util.DEFAULT_USER_AGENT
+import org.jackhuang.hmcl.util.Constants
-import org.jackhuang.hmcl.util.LOG
+import org.jackhuang.hmcl.util.Logging.LOG
-import org.jackhuang.hmcl.util.OS
+import org.jackhuang.hmcl.util.NetworkUtils
+import org.jackhuang.hmcl.util.OperatingSystem
 import java.io.File
 import java.util.logging.Level
 
@@ -34,7 +36,7 @@ fun i18n(key: String): String {
     try {
         return Main.RESOURCE_BUNDLE.getString(key)
     } catch (e: Exception) {
-        LOG.log(Level.WARNING, "Cannot find key $key in resource bundle", e)
+        LOG.log(Level.SEVERE, "Cannot find key $key in resource bundle", e)
         return key
     }
 }
@@ -62,20 +64,21 @@ class Main : Application() {
 
         @JvmStatic
         fun main(args: Array<String>) {
-            DEFAULT_USER_AGENT = { "Hello Minecraft! Launcher" }
+            NetworkUtils.setUserAgentSupplier { "Hello Minecraft! Launcher" }
+            Constants.UI_THREAD_SCHEDULER = Constants.JAVAFX_UI_THREAD_SCHEDULER;
 
             launch(Main::class.java, *args)
         }
 
         fun getWorkingDirectory(folder: String): File {
             val userhome = System.getProperty("user.home", ".")
-            return when (OS.CURRENT_OS) {
+            return when (OperatingSystem.CURRENT_OS) {
-                OS.LINUX -> File(userhome, ".$folder/")
+                OperatingSystem.LINUX -> File(userhome, ".$folder/")
-                OS.WINDOWS -> {
+                OperatingSystem.WINDOWS -> {
                     val appdata: String? = System.getenv("APPDATA")
                     File(appdata ?: userhome, ".$folder/")
                 }
-                OS.OSX -> File(userhome, "Library/Application Support/" + folder)
+                OperatingSystem.OSX -> File(userhome, "Library/Application Support/" + folder)
                 else -> File(userhome, "$folder/")
             }
         }
@@ -89,7 +92,7 @@ class Main : Application() {
 
         fun stopWithoutJavaFXPlatform() = runOnUiThread {
             Controllers.stage.close()
-            Scheduler.shutdown()
+            Schedulers.shutdown()
         }
 
         val RESOURCE_BUNDLE = Settings.locale.resourceBundle

HMCL/src/main/kotlin/org/jackhuang/hmcl/game/AccountHelper.kt

@@ -24,6 +24,7 @@ import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccount
 import org.jackhuang.hmcl.setting.Settings
 import org.jackhuang.hmcl.task.FileDownloadTask
 import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.Schedulers
 import org.jackhuang.hmcl.task.Task
 import org.jackhuang.hmcl.ui.DEFAULT_ICON
 import org.jackhuang.hmcl.ui.DialogController
@@ -48,11 +49,13 @@ object AccountHelper {
             SkinLoadTask(account, proxy, true)
 
     private class SkinLoadTask(val account: YggdrasilAccount, val proxy: Proxy, val refresh: Boolean = false): Task() {
-        override val scheduler = Scheduler.IO
+
-        override val dependencies = mutableListOf<Task>()
+        override fun getScheduler() = Schedulers.io()
+        private val dependencies = mutableListOf<Task>()
+        override fun getDependencies() = dependencies
 
         override fun execute() {
-            if (account.canLogIn && (account.selectedProfile == null || refresh))
+            if (account.canLogIn() && (account.selectedProfile == null || refresh))
                 DialogController.logIn(account)
             val profile = account.selectedProfile ?: return
             val name = profile.name ?: return
@@ -60,7 +63,7 @@ object AccountHelper {
             val file = getSkinFile(name)
             if (!refresh && file.exists())
                 return
-            dependencies += FileDownloadTask(url.toURL(), file, proxy = proxy)
+            dependencies += FileDownloadTask(url.toURL(), file, proxy)
         }
     }
 

HMCL/src/main/kotlin/org/jackhuang/hmcl/game/HMCLGameRepository.kt

@@ -23,8 +23,8 @@ import org.jackhuang.hmcl.setting.EnumGameDirectory
 import org.jackhuang.hmcl.setting.Profile
 import org.jackhuang.hmcl.setting.Settings
 import org.jackhuang.hmcl.setting.VersionSetting
-import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.Schedulers
-import org.jackhuang.hmcl.util.LOG
+import org.jackhuang.hmcl.util.Logging.LOG
 import org.jackhuang.hmcl.util.fromJson
 import java.io.File
 import java.io.IOException
@@ -72,7 +72,7 @@ class HMCLGameRepository(val profile: Profile, baseDirectory: File)
 
     @Synchronized
     override fun refreshVersionsImpl() {
-        Scheduler.NEW_THREAD.schedule {
+        Schedulers.newThread().schedule {
             versionSettings.clear()
 
             super.refreshVersionsImpl()

HMCL/src/main/kotlin/org/jackhuang/hmcl/game/HMCLModpack.kt

@@ -18,7 +18,8 @@
 package org.jackhuang.hmcl.game
 
 import com.google.gson.JsonParseException
-import org.jackhuang.hmcl.download.game.VersionJSONSaveTask
+import org.jackhuang.hmcl.download.game.VersionJsonSaveTask
+import org.jackhuang.hmcl.game.GameVersion.minecraftVersion
 import org.jackhuang.hmcl.mod.Modpack
 import org.jackhuang.hmcl.setting.Profile
 import org.jackhuang.hmcl.task.Task
@@ -26,6 +27,8 @@ import java.io.File
 import java.io.IOException
 import org.jackhuang.hmcl.task.TaskResult
 import org.jackhuang.hmcl.util.*
+import org.jackhuang.hmcl.util.Constants.GSON
+import org.jackhuang.hmcl.util.Logging.LOG
 import java.util.ArrayList
 
 /**
@@ -38,39 +41,42 @@ import java.util.ArrayList
  */
 @Throws(IOException::class, JsonParseException::class)
 fun readHMCLModpackManifest(f: File): Modpack {
-    val manifestJson = f.readTextZipEntry("modpack.json")
+    val manifestJson = CompressingUtils.readTextZipEntry(f, "modpack.json")
     val manifest = GSON.fromJson<Modpack>(manifestJson) ?: throw JsonParseException("`modpack.json` not found. $f is not a valid HMCL modpack.")
-    val gameJson = f.readTextZipEntry("minecraft/pack.json")
+    val gameJson = CompressingUtils.readTextZipEntry(f, "minecraft/pack.json")
     val game = GSON.fromJson<Version>(gameJson) ?: throw JsonParseException("`minecraft/pack.json` not found. $f iot a valid HMCL modpack.")
     return if (game.jar == null)
         if (manifest.gameVersion.isNullOrBlank()) throw JsonParseException("Cannot recognize the game version of modpack $f.")
-        else manifest.copy(manifest = HMCLModpackManifest)
+        else manifest.setManifest(HMCLModpackManifest)
-    else manifest.copy(manifest = HMCLModpackManifest, gameVersion = game.jar!!)
+    else manifest.setManifest(HMCLModpackManifest).setGameVersion(game.jar)
 }
 
 object HMCLModpackManifest
 
-class HMCLModpackInstallTask(profile: Profile, private val zipFile: File, modpack: Modpack, private val name: String): Task() {
+class HMCLModpackInstallTask(profile: Profile, private val zipFile: File, modpack: Modpack, private val version: String): Task() {
     private val dependency = profile.dependency
     private val repository = profile.repository
-    override val dependencies = mutableListOf<Task>()
+    private val dependencies = mutableListOf<Task>()
-    override val dependents = mutableListOf<Task>()
+    private val dependents = mutableListOf<Task>()
+
+    override fun getDependencies() = dependencies
+    override fun getDependents() = dependents
 
     init {
-        check(!repository.hasVersion(name), { "Version $name already exists." })
+        check(!repository.hasVersion(version), { "Version $version already exists." })
-        val json = zipFile.readTextZipEntry("minecraft/pack.json")
+        val json = CompressingUtils.readTextZipEntry(zipFile, "minecraft/pack.json")
         var version = GSON.fromJson<Version>(json)!!
-        version = version.copy(jar = null)
+        version = version.setJar(null)
-        dependents += dependency.gameBuilder().name(name).gameVersion(modpack.gameVersion!!).buildAsync()
+        dependents += dependency.gameBuilder().name(this.version).gameVersion(modpack.gameVersion!!).buildAsync()
-        dependencies += VersionJSONSaveTask(repository, version) // override the json created by buildAsync()
+        dependencies += VersionJsonSaveTask(repository, version) // override the json created by buildAsync()
 
-        onDone += { event -> if (event.failed) repository.removeVersionFromDisk(name) }
+        onDone() += { event -> if (event.isFailed) repository.removeVersionFromDisk(this.version) }
     }
 
-    private val run = repository.getRunDirectory(name)
+    private val run = repository.getRunDirectory(version)
 
     override fun execute() {
-        zipFile.uncompressTo(run, "minecraft/", callback = { it != "minecraft/pack.json" }, ignoreExistentFile = false)
+        CompressingUtils.unzip(zipFile, run, "minecraft/", { it != "minecraft/pack.json" }, false)
     }
 }
 
@@ -120,10 +126,12 @@ class HMCLModpackExportTask @JvmOverloads constructor(
         private val whitelist: List<String>,
         private val modpack: Modpack,
         private val output: File,
-        override val id: String = ID): TaskResult<ZipEngine>() {
+        private val id: String = ID): TaskResult<ZipEngine>() {
+
+    override fun getId() = id
 
     init {
-        onDone += { event -> if (event.failed) output.delete() }
+        onDone() += { event -> if (event.isFailed) output.delete() }
     }
 
     override fun execute() {
@@ -148,8 +156,8 @@ class HMCLModpackExportTask @JvmOverloads constructor(
 
             val mv = repository.getVersion(version).resolve(repository)
             val gameVersion = minecraftVersion(repository.getVersionJar(version)) ?: throw IllegalStateException("Cannot parse the version of $version")
-            zip.putTextFile(GSON.toJson(mv.copy(jar = gameVersion)), "minecraft/pack.json") // Making "jar" to gameVersion is to be compatible with old HMCL.
+            zip.putTextFile(GSON.toJson(mv.setJar(gameVersion)), "minecraft/pack.json") // Making "jar" to gameVersion is to be compatible with old HMCL.
-            zip.putTextFile(GSON.toJson(modpack.copy(gameVersion = gameVersion)), "modpack.json") // Newer HMCL only reads 'gameVersion' field.
+            zip.putTextFile(GSON.toJson(modpack.setGameVersion(gameVersion)), "modpack.json") // Newer HMCL only reads 'gameVersion' field.
         }
     }
 

HMCL/src/main/kotlin/org/jackhuang/hmcl/game/LauncherHelper.kt

@@ -23,7 +23,7 @@ import org.jackhuang.hmcl.auth.AuthInfo
 import org.jackhuang.hmcl.auth.AuthenticationException
 import org.jackhuang.hmcl.launch.DefaultLauncher
 import org.jackhuang.hmcl.launch.ProcessListener
-import org.jackhuang.hmcl.mod.CurseForgeModpackCompletionTask
+import org.jackhuang.hmcl.mod.CurseCompletionTask
 import org.jackhuang.hmcl.setting.LauncherVisibility
 import org.jackhuang.hmcl.setting.Settings
 import org.jackhuang.hmcl.setting.VersionSetting
@@ -31,10 +31,10 @@ import org.jackhuang.hmcl.task.*
 import org.jackhuang.hmcl.ui.*
 import org.jackhuang.hmcl.util.Log4jLevel
 import org.jackhuang.hmcl.util.ManagedProcess
+import org.jackhuang.hmcl.util.task
 import java.util.*
 import java.util.concurrent.ConcurrentLinkedQueue
 
-
 object LauncherHelper {
     private val launchingStepsPane = LaunchingStepsPane()
     val PROCESS = ConcurrentLinkedQueue<ManagedProcess>()
@@ -49,13 +49,13 @@ object LauncherHelper {
         val setting = profile.getVersionSetting(selectedVersion)
 
         Controllers.dialog(launchingStepsPane)
-        task(Scheduler.JAVAFX) { emitStatus(LoadingState.DEPENDENCIES) }
+        task(Schedulers.javafx()) { emitStatus(LoadingState.DEPENDENCIES) }
                 .then(dependency.checkGameCompletionAsync(version))
 
-                .then(task(Scheduler.JAVAFX) { emitStatus(LoadingState.MODS) })
+                .then(task(Schedulers.javafx()) { emitStatus(LoadingState.MODS) })
-                .then(CurseForgeModpackCompletionTask(dependency, selectedVersion))
+                .then(CurseCompletionTask(dependency, selectedVersion))
 
-                .then(task(Scheduler.JAVAFX) { emitStatus(LoadingState.LOGIN) })
+                .then(task(Schedulers.javafx()) { emitStatus(LoadingState.LOGIN) })
                 .then(task {
                     try {
                         it["account"] = account.logIn(Settings.proxy)
@@ -65,7 +65,7 @@ object LauncherHelper {
                     }
                 })
 
-                .then(task(Scheduler.JAVAFX) { emitStatus(LoadingState.LAUNCHING) })
+                .then(task(Schedulers.javafx()) { emitStatus(LoadingState.LAUNCHING) })
                 .then(task {
                     it["launcher"] = HMCLGameLauncher(
                             repository = repository,
@@ -84,12 +84,12 @@ object LauncherHelper {
 
                 .executor()
                 .apply {
-                    taskListener = object : TaskListener {
+                    taskListener = object : TaskListener() {
                         var finished = 0
 
                         override fun onFinished(task: Task) {
                             ++finished
-                            runOnUiThread { launchingStepsPane.pgsTasks.progress = 1.0 * finished / totTask.get() }
+                            runOnUiThread { launchingStepsPane.pgsTasks.progress = 1.0 * finished / runningTasks }
                         }
 
                         override fun onTerminate() {
@@ -179,9 +179,14 @@ object LauncherHelper {
             if (exitType != ProcessListener.ExitType.NORMAL && logWindow == null){
                 runOnUiThread {
                     LogWindow().apply {
-                        for ((line, level) in logs)
-                            logLine(line, level)
                         show()
+                        Schedulers.newThread().schedule {
+                            waitForShown()
+                            runOnUiThread {
+                                for ((line, level) in logs)
+                                    logLine(line, level)
+                            }
+                        }
                     }
                 }
             }

HMCL/src/main/kotlin/org/jackhuang/hmcl/game/ModpackHelper.kt

@@ -17,21 +17,18 @@
  */
 package org.jackhuang.hmcl.game
 
-import org.jackhuang.hmcl.mod.InstanceConfiguration
+import org.jackhuang.hmcl.mod.*
-import org.jackhuang.hmcl.mod.Modpack
-import org.jackhuang.hmcl.mod.readCurseForgeModpackManifest
-import org.jackhuang.hmcl.mod.readMMCModpackManifest
 import org.jackhuang.hmcl.setting.EnumGameDirectory
 import org.jackhuang.hmcl.setting.Profile
 import org.jackhuang.hmcl.setting.VersionSetting
-import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.Schedulers
 import org.jackhuang.hmcl.task.Task
 import org.jackhuang.hmcl.util.toStringOrEmpty
 import java.io.File
 
 fun readModpackManifest(f: File): Modpack {
     try {
-        return readCurseForgeModpackManifest(f)
+        return CurseManifest.readCurseForgeModpackManifest(f);
     } catch (e: Exception) {
         // ignore it, not a valid CurseForge modpack.
     }
@@ -44,7 +41,7 @@ fun readModpackManifest(f: File): Modpack {
     }
 
     try {
-        val manifest = readMMCModpackManifest(f)
+        val manifest = MultiMCInstanceConfiguration.readMultiMCModpackManifest(f)
         return manifest
     } catch (e: Exception) {
         // ignore it, not a valid MMC modpack.
@@ -53,36 +50,36 @@ fun readModpackManifest(f: File): Modpack {
     throw IllegalArgumentException("Modpack file $f is not supported.")
 }
 
-fun InstanceConfiguration.toVersionSetting(vs: VersionSetting) {
+fun MultiMCInstanceConfiguration.toVersionSetting(vs: VersionSetting) {
     vs.usesGlobal = false
     vs.gameDirType = EnumGameDirectory.VERSION_FOLDER
 
-    if (overrideJavaLocation) {
+    if (isOverrideJavaLocation) {
         vs.javaDir = javaPath.toStringOrEmpty()
     }
 
-    if (overrideMemory) {
+    if (isOverrideMemory) {
         vs.permSize = permGen.toStringOrEmpty()
         if (maxMemory != null)
             vs.maxMemory = maxMemory!!
         vs.minMemory = minMemory
     }
 
-    if (overrideCommands) {
+    if (isOverrideCommands) {
         vs.wrapper = wrapperCommand.orEmpty()
         vs.precalledCommand = preLaunchCommand.orEmpty()
     }
 
-    if (overrideJavaArgs) {
+    if (isOverrideJavaArgs) {
         vs.javaArgs = jvmArgs.orEmpty()
     }
 
-    if (overrideConsole) {
+    if (isOverrideConsole) {
-        vs.showLogs = showConsole
+        vs.showLogs = isShowConsole
     }
 
-    if (overrideWindow) {
+    if (isOverrideWindow) {
-        vs.fullscreen = fullscreen
+        vs.fullscreen = isFullscreen
         if (width != null)
             vs.width = width!!
         if (height != null)
@@ -90,10 +87,10 @@ fun InstanceConfiguration.toVersionSetting(vs: VersionSetting) {
     }
 }
 
-class MMCInstallVersionSettingTask(private val profile: Profile, val manifest: InstanceConfiguration, val name: String): Task() {
+class MMCInstallVersionSettingTask(private val profile: Profile, val manifest: MultiMCInstanceConfiguration, private val version: String): Task() {
-    override val scheduler = Scheduler.JAVAFX
+    override fun getScheduler() = Schedulers.javafx()
     override fun execute() {
-        val vs = profile.specializeVersionSetting(name)!!
+        val vs = profile.specializeVersionSetting(version)!!
         manifest.toVersionSetting(vs)
     }
 }

HMCL/src/main/kotlin/org/jackhuang/hmcl/setting/Profile.kt

@@ -20,7 +20,7 @@ package org.jackhuang.hmcl.setting
 import com.google.gson.*
 import javafx.beans.InvalidationListener
 import org.jackhuang.hmcl.download.DefaultDependencyManager
-import org.jackhuang.hmcl.event.EVENT_BUS
+import org.jackhuang.hmcl.event.EventBus
 import org.jackhuang.hmcl.event.RefreshedVersionsEvent
 import org.jackhuang.hmcl.game.HMCLGameRepository
 import org.jackhuang.hmcl.mod.ModManager
@@ -49,7 +49,7 @@ class Profile(name: String = "Default", initialGameDir: File = File(".minecraft"
     init {
         gameDirProperty.onChange { repository.changeDirectory(it!!) }
         selectedVersionProperty.onInvalidated(this::verifySelectedVersion)
-        EVENT_BUS.channel<RefreshedVersionsEvent>() += { event -> if (event.source == repository) verifySelectedVersion() }
+        EventBus.EVENT_BUS.channel<RefreshedVersionsEvent>().register { event -> if (event.source == repository) verifySelectedVersion() }
     }
 
     private fun verifySelectedVersion() = runOnUiThread {

HMCL/src/main/kotlin/org/jackhuang/hmcl/setting/Settings.kt

@@ -27,9 +27,10 @@ import org.jackhuang.hmcl.auth.Account
 import org.jackhuang.hmcl.download.BMCLAPIDownloadProvider
 import org.jackhuang.hmcl.download.DownloadProvider
 import org.jackhuang.hmcl.download.MojangDownloadProvider
-import org.jackhuang.hmcl.event.EVENT_BUS
+import org.jackhuang.hmcl.event.EventBus
-import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.Schedulers
 import org.jackhuang.hmcl.util.*
+import org.jackhuang.hmcl.util.Logging.LOG
 import java.io.File
 import java.io.IOException
 import java.net.Authenticator
@@ -43,7 +44,7 @@ object Settings {
     val GSON = GsonBuilder()
             .registerTypeAdapter(VersionSetting::class.java, VersionSetting)
             .registerTypeAdapter(Profile::class.java, Profile)
-            .registerTypeAdapter(File::class.java, FileTypeAdapter)
+            .registerTypeAdapter(File::class.java, FileTypeAdapter.INSTANCE)
             .setPrettyPrinting().create()
 
     const val DEFAULT_PROFILE = "Default"
@@ -209,14 +210,14 @@ object Settings {
 
     var downloadProvider: DownloadProvider
         get() = when (SETTINGS.downloadtype) {
-            0 -> MojangDownloadProvider
+            0 -> MojangDownloadProvider.INSTANCE
-            1 -> BMCLAPIDownloadProvider
+            1 -> BMCLAPIDownloadProvider.INSTANCE
-            else -> MojangDownloadProvider
+            else -> MojangDownloadProvider.INSTANCE
         }
         set(value) {
             SETTINGS.downloadtype = when (value) {
-                MojangDownloadProvider -> 0
+                MojangDownloadProvider.INSTANCE -> 0
-                BMCLAPIDownloadProvider -> 1
+                BMCLAPIDownloadProvider.INSTANCE -> 1
                 else -> 0
             }
         }
@@ -275,14 +276,14 @@ object Settings {
         get() {
             if (!hasProfile(SETTINGS.selectedProfile)) {
                 SETTINGS.selectedProfile = DEFAULT_PROFILE
-                Scheduler.COMPUTATION.schedule { onProfileChanged() }
+                Schedulers.computation().schedule { onProfileChanged() }
             }
             return getProfile(SETTINGS.selectedProfile)
         }
         set(value) {
             if (hasProfile(value.name) && value.name != SETTINGS.selectedProfile) {
                 SETTINGS.selectedProfile = value.name
-                Scheduler.COMPUTATION.schedule { onProfileChanged() }
+                Schedulers.computation().schedule { onProfileChanged() }
             }
         }
 
@@ -327,14 +328,14 @@ object Settings {
         }
         val flag = getProfileMap().remove(ver) != null
         if (flag)
-            Scheduler.COMPUTATION.schedule { onProfileLoading() }
+            Schedulers.computation().schedule { onProfileLoading() }
 
         return flag
     }
 
     internal fun onProfileChanged() {
         selectedProfile.repository.refreshVersions()
-        EVENT_BUS.fireEvent(ProfileChangedEvent(SETTINGS, selectedProfile))
+        EventBus.EVENT_BUS.fireEvent(ProfileChangedEvent(SETTINGS, selectedProfile))
     }
 
     /**
@@ -342,7 +343,7 @@ object Settings {
      * Invoked by loading GUI phase.
      */
     fun onProfileLoading() {
-        EVENT_BUS.fireEvent(ProfileLoadingEvent(SETTINGS))
+        EventBus.EVENT_BUS.fireEvent(ProfileLoadingEvent(SETTINGS))
         onProfileChanged()
     }
 }

HMCL/src/main/kotlin/org/jackhuang/hmcl/setting/SettingsConstants.kt

@@ -21,7 +21,9 @@ import javafx.scene.text.Font
 import org.jackhuang.hmcl.auth.Account
 import org.jackhuang.hmcl.auth.AccountFactory
 import org.jackhuang.hmcl.auth.OfflineAccount
+import org.jackhuang.hmcl.auth.OfflineAccountFactory
 import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccount
+import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccountFactory
 import org.jackhuang.hmcl.download.BMCLAPIDownloadProvider
 import org.jackhuang.hmcl.download.MojangDownloadProvider
 import org.jackhuang.hmcl.ui.construct.UTF8Control
@@ -35,19 +37,18 @@ object Proxies {
 }
 
 object DownloadProviders {
-    val DOWNLOAD_PROVIDERS = listOf(MojangDownloadProvider, BMCLAPIDownloadProvider)
+    val DOWNLOAD_PROVIDERS = listOf(MojangDownloadProvider.INSTANCE, BMCLAPIDownloadProvider.INSTANCE)
 
-    fun getDownloadProvider(index: Int) = DOWNLOAD_PROVIDERS.getOrElse(index, { MojangDownloadProvider })
+    fun getDownloadProvider(index: Int) = DOWNLOAD_PROVIDERS.getOrElse(index, { MojangDownloadProvider.INSTANCE })
 }
 
 object Accounts {
     val OFFLINE_ACCOUNT_KEY = "offline"
     val YGGDRASIL_ACCOUNT_KEY = "yggdrasil"
 
-    val ACCOUNTS = listOf(OfflineAccount, YggdrasilAccount)
     val ACCOUNT_FACTORY = mapOf<String, AccountFactory<*>>(
-            OFFLINE_ACCOUNT_KEY to OfflineAccount,
+            OFFLINE_ACCOUNT_KEY to OfflineAccountFactory.INSTANCE,
-            YGGDRASIL_ACCOUNT_KEY to YggdrasilAccount
+            YGGDRASIL_ACCOUNT_KEY to YggdrasilAccountFactory.INSTANCE
     )
 
     fun getAccountType(account: Account): String {

HMCL/src/main/kotlin/org/jackhuang/hmcl/setting/VersionSetting.kt

@@ -21,6 +21,10 @@ import com.google.gson.*
 import javafx.beans.InvalidationListener
 import org.jackhuang.hmcl.Main
 import org.jackhuang.hmcl.game.LaunchOptions
+import org.jackhuang.hmcl.setting.Settings.proxyHost
+import org.jackhuang.hmcl.setting.Settings.proxyPass
+import org.jackhuang.hmcl.setting.Settings.proxyPort
+import org.jackhuang.hmcl.setting.Settings.proxyUser
 import org.jackhuang.hmcl.util.*
 import java.io.File
 import java.io.IOException
@@ -70,7 +74,7 @@ class VersionSetting() {
     /**
      * The maximum memory that JVM can allocate for heap.
      */
-    val maxMemoryProperty = ImmediateIntegerProperty(this, "maxMemory", OS.SUGGESTED_MEMORY)
+    val maxMemoryProperty = ImmediateIntegerProperty(this, "maxMemory", OperatingSystem.SUGGESTED_MEMORY.toInt())
     var maxMemory: Int by maxMemoryProperty
 
     /**
@@ -232,28 +236,28 @@ class VersionSetting() {
 
     @Throws(IOException::class)
     fun toLaunchOptions(gameDir: File): LaunchOptions {
-        return LaunchOptions(
+        return LaunchOptions.Builder()
-                gameDir = gameDir,
+                .setGameDir(gameDir)
-                java = javaVersion ?: JavaVersion.fromCurrentEnvironment(),
+                .setJava(javaVersion ?: JavaVersion.fromCurrentEnvironment())
-                versionName = Main.TITLE,
+                .setVersionName(Main.TITLE)
-                profileName = Main.TITLE,
+                .setProfileName(Main.TITLE)
-                minecraftArgs = minecraftArgs,
+                .setMinecraftArgs(minecraftArgs)
-                javaArgs = javaArgs,
+                .setJavaArgs(javaArgs)
-                maxMemory = maxMemory,
+                .setMaxMemory(maxMemory)
-                minMemory = minMemory,
+                .setMinMemory(minMemory)
-                metaspace = permSize.toIntOrNull(),
+                .setMetaspace(permSize.toIntOrNull())
-                width = width,
+                .setWidth(width)
-                height = height,
+                .setHeight(height)
-                fullscreen = fullscreen,
+                .setFullscreen(fullscreen)
-                serverIp = serverIp,
+                .setServerIp(serverIp)
-                wrapper = wrapper,
+                .setWrapper(wrapper)
-                proxyHost = Settings.proxyHost,
+                .setProxyHost(Settings.proxyHost)
-                proxyPort = Settings.proxyPort,
+                .setProxyPort(Settings.proxyPort)
-                proxyUser = Settings.proxyUser,
+                .setProxyUser(Settings.proxyUser)
-                proxyPass = Settings.proxyPass,
+                .setProxyPass(Settings.proxyPass)
-                precalledCommand = precalledCommand,
+                .setPrecalledCommand(precalledCommand)
-                noGeneratedJVMArgs = noJVMArgs
+                .setNoGeneratedJVMArgs(noJVMArgs)
-        )
+                .create()
     }
 
     companion object Serializer: JsonSerializer<VersionSetting>, JsonDeserializer<VersionSetting> {
@@ -264,7 +268,7 @@ class VersionSetting() {
                 addProperty("usesGlobal", src.usesGlobal)
                 addProperty("javaArgs", src.javaArgs)
                 addProperty("minecraftArgs", src.minecraftArgs)
-                addProperty("maxMemory", if (src.maxMemory <= 0) OS.SUGGESTED_MEMORY else src.maxMemory)
+                addProperty("maxMemory", if (src.maxMemory <= 0) OperatingSystem.SUGGESTED_MEMORY.toInt() else src.maxMemory)
                 addProperty("minMemory", src.minMemory)
                 addProperty("permSize", src.permSize)
                 addProperty("width", src.width)
@@ -290,8 +294,8 @@ class VersionSetting() {
         override fun deserialize(json: JsonElement?, typeOfT: Type?, context: JsonDeserializationContext?): VersionSetting? {
             if (json == null || json == JsonNull.INSTANCE || json !is JsonObject) return null
 
-            var maxMemoryN = parseJsonPrimitive(json["maxMemory"]?.asJsonPrimitive, OS.SUGGESTED_MEMORY)
+            var maxMemoryN = parseJsonPrimitive(json["maxMemory"]?.asJsonPrimitive, OperatingSystem.SUGGESTED_MEMORY.toInt())
-            if (maxMemoryN <= 0) maxMemoryN = OS.SUGGESTED_MEMORY
+            if (maxMemoryN <= 0) maxMemoryN = OperatingSystem.SUGGESTED_MEMORY.toInt()
 
             return VersionSetting().apply {
                 usesGlobal = json["usesGlobal"]?.asBoolean ?: false

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/AccountItem.kt

@@ -39,6 +39,7 @@ import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccount
 import org.jackhuang.hmcl.game.AccountHelper
 import org.jackhuang.hmcl.setting.Settings
 import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.Schedulers
 import java.util.concurrent.Callable
 
 class AccountItem(i: Int, val account: Account, group: ToggleGroup) : StackPane() {
@@ -83,10 +84,10 @@ class AccountItem(i: Int, val account: Account, group: ToggleGroup) : StackPane(
             btnRefresh.setOnMouseClicked {
                 pgsSkin.isVisible = true
                 AccountHelper.refreshSkinAsync(account)
-                        .subscribe(Scheduler.JAVAFX) { loadSkin() }
+                        .subscribe(Schedulers.javafx()) { loadSkin() }
             }
             AccountHelper.loadSkinAsync(account)
-                    .subscribe(Scheduler.JAVAFX) { loadSkin() }
+                    .subscribe(Schedulers.javafx()) { loadSkin() }
         }
 
         if (account is OfflineAccount) { // Offline Account cannot be refreshed,

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/AccountsPage.kt

@@ -29,15 +29,17 @@ import javafx.scene.control.ToggleGroup
 import javafx.scene.layout.StackPane
 import org.jackhuang.hmcl.auth.Account
 import org.jackhuang.hmcl.auth.OfflineAccount
+import org.jackhuang.hmcl.auth.OfflineAccountFactory
 import org.jackhuang.hmcl.auth.yggdrasil.InvalidCredentialsException
 import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccount
+import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccountFactory
 import org.jackhuang.hmcl.i18n
 import org.jackhuang.hmcl.setting.Settings
-import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.Schedulers
-import org.jackhuang.hmcl.task.taskResult
 import org.jackhuang.hmcl.ui.wizard.DecoratorPage
 import org.jackhuang.hmcl.util.onChange
 import org.jackhuang.hmcl.util.onChangeAndOperate
+import org.jackhuang.hmcl.util.taskResult
 
 class AccountsPage() : StackPane(), DecoratorPage {
     override val titleProperty: StringProperty = SimpleStringProperty(this, "title", "Accounts")
@@ -126,8 +128,8 @@ class AccountsPage() : StackPane(), DecoratorPage {
         taskResult("create_account") {
             try {
                 val account = when (type) {
-                    0 -> OfflineAccount.fromUsername(username)
+                    0 -> OfflineAccountFactory.INSTANCE.fromUsername(username)
-                    1 -> YggdrasilAccount.fromUsername(username, password)
+                    1 -> YggdrasilAccountFactory.INSTANCE.fromUsername(username, password)
                     else -> throw UnsupportedOperationException()
                 }
 
@@ -136,7 +138,7 @@ class AccountsPage() : StackPane(), DecoratorPage {
             } catch (e: Exception) {
                 e
             }
-        }.subscribe(Scheduler.JAVAFX) {
+        }.subscribe(Schedulers.javafx()) {
             val account: Any = it["create_account"]
             if (account is Account) {
                 Settings.addAccount(account)

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/Controllers.kt

@@ -25,8 +25,8 @@ import javafx.scene.layout.Region
 import javafx.stage.Stage
 import org.jackhuang.hmcl.Main
 import org.jackhuang.hmcl.setting.Settings
-import org.jackhuang.hmcl.task.task
 import org.jackhuang.hmcl.util.JavaVersion
+import org.jackhuang.hmcl.util.task
 
 object Controllers {
     lateinit var scene: Scene private set

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/FXUtils.kt

@@ -43,6 +43,7 @@ import javafx.scene.shape.Rectangle
 import javafx.util.Duration
 import org.jackhuang.hmcl.Main
 import org.jackhuang.hmcl.util.*
+import org.jackhuang.hmcl.util.Logging.LOG
 import java.io.File
 import java.io.IOException
 import java.util.logging.Level
@@ -196,8 +197,8 @@ fun JFXMasonryPane.resetChildren(children: List<Node>) {
 fun openFolder(f: File) {
     f.mkdirs()
     val path = f.absolutePath
-    when (OS.CURRENT_OS) {
+    when (OperatingSystem.CURRENT_OS) {
-        OS.OSX ->
+        OperatingSystem.OSX ->
             try {
                 Runtime.getRuntime().exec(arrayOf("/usr/bin/open", path));
             } catch (ex: IOException) {

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/InstallerController.kt

@@ -20,13 +20,13 @@ package org.jackhuang.hmcl.ui
 import javafx.fxml.FXML
 import javafx.scene.control.ScrollPane
 import javafx.scene.layout.VBox
-import org.jackhuang.hmcl.download.game.VersionJSONSaveTask
+import org.jackhuang.hmcl.download.game.VersionJsonSaveTask
+import org.jackhuang.hmcl.game.GameVersion.minecraftVersion
 import org.jackhuang.hmcl.game.Version
-import org.jackhuang.hmcl.game.minecraftVersion
 import org.jackhuang.hmcl.setting.Profile
-import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.Schedulers
-import org.jackhuang.hmcl.task.task
 import org.jackhuang.hmcl.ui.download.InstallWizardProvider
+import org.jackhuang.hmcl.util.task
 import java.util.*
 
 class InstallerController {
@@ -59,9 +59,9 @@ class InstallerController {
             val removeAction = { _: InstallerItem ->
                 val newList = LinkedList(version.libraries)
                 newList.remove(library)
-                VersionJSONSaveTask(profile.repository, version.copy(libraries = newList))
+                VersionJsonSaveTask(profile.repository, version.setLibraries(newList))
                         .with(task { profile.repository.refreshVersions() })
-                        .with(task(Scheduler.JAVAFX) { loadVersion(this.profile, this.versionId) })
+                        .with(task(Schedulers.javafx()) { loadVersion(this.profile, this.versionId) })
                         .start()
             }
             if (library.groupId.equals("net.minecraftforge", ignoreCase = true) && library.artifactId.equals("forge", ignoreCase = true)) {

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/LeftPaneController.kt

@@ -22,13 +22,15 @@ import javafx.scene.paint.Paint
 import org.jackhuang.hmcl.ProfileChangedEvent
 import org.jackhuang.hmcl.ProfileLoadingEvent
 import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccount
-import org.jackhuang.hmcl.event.EVENT_BUS
+import org.jackhuang.hmcl.event.EventBus
 import org.jackhuang.hmcl.game.AccountHelper
 import org.jackhuang.hmcl.i18n
 import org.jackhuang.hmcl.setting.Settings
 import org.jackhuang.hmcl.ui.construct.IconedItem
 import org.jackhuang.hmcl.ui.construct.RipplerContainer
+import org.jackhuang.hmcl.util.channel
 import org.jackhuang.hmcl.util.onChangeAndOperate
+import org.jackhuang.hmcl.util.plusAssign
 import java.util.*
 
 class LeftPaneController(private val leftPane: AdvancedListBox) {
@@ -56,8 +58,8 @@ class LeftPaneController(private val leftPane: AdvancedListBox) {
                 .startCategory(i18n("ui.label.profile"))
                 .add(profilePane)
 
-        EVENT_BUS.channel<ProfileLoadingEvent>() += this::onProfilesLoading
+        EventBus.EVENT_BUS.channel<ProfileLoadingEvent>() += this::onProfilesLoading
-        EVENT_BUS.channel<ProfileChangedEvent>() += this::onProfileChanged
+        EventBus.EVENT_BUS.channel<ProfileChangedEvent>() += this::onProfileChanged
 
         Controllers.decorator.addMenuButton.setOnMouseClicked {
             Controllers.decorator.showPage(ProfilePage(null))

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/LogWindow.kt

@@ -38,6 +38,7 @@ import org.jackhuang.hmcl.util.*
 import org.w3c.dom.Document
 import org.w3c.dom.Node
 import java.util.concurrent.Callable
+import java.util.concurrent.CountDownLatch
 
 class LogWindow : Stage() {
     val fatalProperty = SimpleIntegerProperty(0)
@@ -47,6 +48,7 @@ class LogWindow : Stage() {
     val debugProperty = SimpleIntegerProperty(0)
 
     val impl = LogWindowImpl()
+    val latch = CountDownLatch(1)
 
     init {
         scene = Scene(impl, 800.0, 480.0)
@@ -74,6 +76,8 @@ class LogWindow : Stage() {
         }
     }
 
+    fun waitForShown() = latch.await()
+
     inner class LogWindowImpl: StackPane() {
         @FXML lateinit var webView: WebView
         @FXML lateinit var btnFatals: ToggleButton
@@ -97,6 +101,7 @@ class LogWindow : Stage() {
                     document = engine.document
                     body = document.getElementsByTagName("body").item(0)
                     engine.executeScript("limitedLogs=${Settings.logLines};")
+                    latch.countDown()
                 }
             }
 

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/MainPage.kt

@@ -29,17 +29,19 @@ import javafx.scene.image.Image
 import javafx.scene.layout.StackPane
 import org.jackhuang.hmcl.ProfileChangedEvent
 import org.jackhuang.hmcl.ProfileLoadingEvent
-import org.jackhuang.hmcl.event.EVENT_BUS
+import org.jackhuang.hmcl.event.EventBus
 import org.jackhuang.hmcl.event.RefreshedVersionsEvent
+import org.jackhuang.hmcl.game.GameVersion.minecraftVersion
 import org.jackhuang.hmcl.game.LauncherHelper
-import org.jackhuang.hmcl.game.minecraftVersion
 import org.jackhuang.hmcl.i18n
 import org.jackhuang.hmcl.setting.Profile
 import org.jackhuang.hmcl.setting.Settings
 import org.jackhuang.hmcl.ui.construct.RipplerContainer
 import org.jackhuang.hmcl.ui.download.DownloadWizardProvider
 import org.jackhuang.hmcl.ui.wizard.DecoratorPage
+import org.jackhuang.hmcl.util.channel
 import org.jackhuang.hmcl.util.onChange
+import org.jackhuang.hmcl.util.plusAssign
 
 /**
  * @see /assets/fxml/main.fxml
@@ -59,9 +61,9 @@ class MainPage : StackPane(), DecoratorPage {
         btnLaunch.limitWidth(40.0)
         btnLaunch.limitHeight(40.0)
 
-        EVENT_BUS.channel<RefreshedVersionsEvent>() += { -> loadVersions() }
+        EventBus.EVENT_BUS.channel<RefreshedVersionsEvent>() += { -> loadVersions() }
-        EVENT_BUS.channel<ProfileLoadingEvent>() += this::onProfilesLoading
+        EventBus.EVENT_BUS.channel<ProfileLoadingEvent>() += this::onProfilesLoading
-        EVENT_BUS.channel<ProfileChangedEvent>() += this::onProfileChanged
+        EventBus.EVENT_BUS.channel<ProfileChangedEvent>() += this::onProfileChanged
 
         btnAdd.setOnMouseClicked { Controllers.decorator.startWizard(DownloadWizardProvider(), "Install New Game") }
         btnRefresh.setOnMouseClicked { Settings.selectedProfile.repository.refreshVersions() }

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/ModController.kt

@@ -27,9 +27,10 @@ import javafx.stage.FileChooser
 import org.jackhuang.hmcl.i18n
 import org.jackhuang.hmcl.mod.ModManager
 import org.jackhuang.hmcl.task.Scheduler
-import org.jackhuang.hmcl.task.task
+import org.jackhuang.hmcl.task.Schedulers
 import org.jackhuang.hmcl.util.onChange
 import org.jackhuang.hmcl.util.onChangeAndOperateWeakly
+import org.jackhuang.hmcl.util.task
 import java.util.*
 
 class ModController {
@@ -77,7 +78,7 @@ class ModController {
                         modManager.removeMods(versionId, modInfo)
                         loadMods(modManager, versionId)
                     }.apply {
-                        modInfo.activeProperty.onChange {
+                        modInfo.activeProperty().onChange {
                             if (it)
                                 styleClass -= "disabled"
                             else
@@ -91,7 +92,7 @@ class ModController {
                 runOnUiThread { rootPane.children += contentPane }
                 it["list"] = list
             }
-        }.subscribe(Scheduler.JAVAFX) { variables ->
+        }.subscribe(Schedulers.javafx()) { variables ->
             parentTab.selectionModel.selectedItemProperty().onChangeAndOperateWeakly {
                 if (it?.userData == this) {
                     modPane.children.setAll(variables.get<List<ModItem>>("list"))
@@ -106,6 +107,6 @@ class ModController {
         chooser.extensionFilters.setAll(FileChooser.ExtensionFilter("Mod", "*.jar", "*.zip", "*.litemod"))
         val res = chooser.showOpenDialog(Controllers.stage) ?: return
         task { modManager.addMod(versionId, res) }
-                .subscribe(task(Scheduler.JAVAFX) { loadMods(modManager, versionId) })
+                .subscribe(task(Schedulers.javafx()) { loadMods(modManager, versionId) })
     }
 }

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/ModItem.kt

@@ -53,10 +53,10 @@ class ModItem(info: ModInfo, private val deleteCallback: (ModItem) -> Unit) : Bo
         style = "-fx-background-radius: 2; -fx-background-color: white; -fx-padding: 8;"
         JFXDepthManager.setDepth(this, 1)
         lblModFileName.text = info.fileName
-        lblModAuthor.text = "${info.name}, Version: ${info.version}, Game Version: ${info.mcversion}, Authors: ${info.authors}"
+        lblModAuthor.text = "${info.name}, Version: ${info.version}, Game Version: ${info.gameVersion}, Authors: ${info.authors}"
         chkEnabled.isSelected = info.isActive
         chkEnabled.selectedProperty().onChange {
-            info.activeProperty.set(it)
+            info.activeProperty().set(it)
         }
     }
 

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/VersionSettingsController.kt

@@ -24,25 +24,21 @@ import javafx.scene.Node
 import javafx.scene.control.Label
 import javafx.scene.control.ScrollPane
 import javafx.scene.control.Toggle
-import javafx.scene.control.ToggleGroup
 import javafx.scene.image.Image
 import javafx.scene.image.ImageView
-import javafx.scene.layout.BorderPane
-import javafx.scene.layout.Pane
 import javafx.scene.layout.VBox
-import javafx.stage.DirectoryChooser
 import javafx.stage.FileChooser
 import org.jackhuang.hmcl.i18n
 import org.jackhuang.hmcl.setting.EnumGameDirectory
 import org.jackhuang.hmcl.setting.Profile
 import org.jackhuang.hmcl.setting.VersionSetting
-import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.Schedulers
-import org.jackhuang.hmcl.task.task
 import org.jackhuang.hmcl.ui.construct.ComponentList
 import org.jackhuang.hmcl.ui.construct.MultiFileItem
 import org.jackhuang.hmcl.ui.construct.NumberValidator
 import org.jackhuang.hmcl.util.JavaVersion
-import org.jackhuang.hmcl.util.OS
+import org.jackhuang.hmcl.util.OperatingSystem
+import org.jackhuang.hmcl.util.task
 
 class VersionSettingsController {
     var lastVersionSetting: VersionSetting? = null
@@ -74,7 +70,7 @@ class VersionSettingsController {
     lateinit var versionId: String
 
     fun initialize() {
-        lblPhysicalMemory.text = i18n("settings.physical_memory") + ": ${OS.TOTAL_MEMORY}MB"
+        lblPhysicalMemory.text = i18n("settings.physical_memory") + ": ${OperatingSystem.TOTAL_MEMORY}MB"
 
         scroll.smoothScrolling()
 
@@ -102,9 +98,9 @@ class VersionSettingsController {
 
         task {
             it["list"] = JavaVersion.getJREs().values.map { javaVersion ->
-                javaItem.createChildren(javaVersion.longVersion, javaVersion.binary.absolutePath, javaVersion)
+                javaItem.createChildren(javaVersion.version, javaVersion.binary.absolutePath, javaVersion)
             }
-        }.subscribe(Scheduler.JAVAFX) {
+        }.subscribe(Schedulers.javafx()) {
             javaItem.loadChildren(it.get<Collection<Node>>("list"))
         }
 
@@ -175,7 +171,7 @@ class VersionSettingsController {
             if (newValue == javaItem.radioCustom) { // Custom
                 version.java = "Custom"
             } else {
-                version.java = ((newValue as JFXRadioButton).userData as JavaVersion).longVersion
+                version.java = ((newValue as JFXRadioButton).userData as JavaVersion).version
             }
         }
         javaItem.group.properties[javaGroupKey] = listener
@@ -220,7 +216,7 @@ class VersionSettingsController {
 
     private fun initJavaSubtitle(version: VersionSetting) {
         task { it["java"] = version.javaVersion }
-                .subscribe(task(Scheduler.JAVAFX) { javaItem.subtitle = it.get<JavaVersion?>("java")?.binary?.absolutePath ?: "Invalid Java Directory" })
+                .subscribe(task(Schedulers.javafx()) { javaItem.subtitle = it.get<JavaVersion?>("java")?.binary?.absolutePath ?: "Invalid Java Directory" })
     }
 
     private fun initGameDirSubtitle(version: VersionSetting) {

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/YggdrasilAccountLoginPane.kt

@@ -26,10 +26,11 @@ import javafx.scene.layout.StackPane
 import org.jackhuang.hmcl.auth.AuthInfo
 import org.jackhuang.hmcl.auth.yggdrasil.InvalidCredentialsException
 import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccount
+import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccountFactory
 import org.jackhuang.hmcl.i18n
 import org.jackhuang.hmcl.setting.Settings
-import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.Schedulers
-import org.jackhuang.hmcl.task.taskResult
+import org.jackhuang.hmcl.util.taskResult
 
 class YggdrasilAccountLoginPane(private val oldAccount: YggdrasilAccount, private val success: (AuthInfo) -> Unit, private val failed: () -> Unit) : StackPane() {
     @FXML lateinit var lblUsername: Label
@@ -54,12 +55,12 @@ class YggdrasilAccountLoginPane(private val oldAccount: YggdrasilAccount, privat
         lblCreationWarning.text = ""
         taskResult("login") {
             try {
-                val account = YggdrasilAccount.fromUsername(username, password)
+                val account = YggdrasilAccountFactory.INSTANCE.fromUsername(username, password)
                 account.logIn(Settings.proxy)
             } catch (e: Exception) {
                 e
             }
-        }.subscribe(Scheduler.JAVAFX) {
+        }.subscribe(Schedulers.javafx()) {
             val account: Any = it["login"]
             if (account is AuthInfo) {
                 success(account)

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/download/DownloadWizardProvider.kt

@@ -18,7 +18,6 @@
 package org.jackhuang.hmcl.ui.download
 
 import javafx.scene.Node
-import org.jackhuang.hmcl.download.BMCLAPIDownloadProvider
 import org.jackhuang.hmcl.game.HMCLModpackInstallTask
 import org.jackhuang.hmcl.game.HMCLModpackManifest
 import org.jackhuang.hmcl.game.MMCInstallVersionSettingTask
@@ -27,9 +26,9 @@ import org.jackhuang.hmcl.setting.EnumGameDirectory
 import org.jackhuang.hmcl.setting.Profile
 import org.jackhuang.hmcl.setting.Settings
 import org.jackhuang.hmcl.task.Task
-import org.jackhuang.hmcl.task.task
 import org.jackhuang.hmcl.ui.wizard.WizardController
 import org.jackhuang.hmcl.ui.wizard.WizardProvider
+import org.jackhuang.hmcl.util.task
 import java.io.File
 
 class DownloadWizardProvider(): WizardProvider() {
@@ -79,11 +78,11 @@ class DownloadWizardProvider(): WizardProvider() {
         }
 
         return when (modpack.manifest) {
-            is CurseForgeModpackManifest -> CurseForgeModpackInstallTask(profile.dependency, selectedFile, modpack.manifest as CurseForgeModpackManifest, name)
+            is CurseManifest -> CurseInstallTask(profile.dependency, selectedFile, modpack.manifest as CurseManifest, name)
             is HMCLModpackManifest -> HMCLModpackInstallTask(profile, selectedFile, modpack, name)
-            is InstanceConfiguration -> MMCModpackInstallTask(profile.dependency, selectedFile, modpack.manifest as InstanceConfiguration, name) with MMCInstallVersionSettingTask(profile, modpack.manifest as InstanceConfiguration, name)
+            is MultiMCInstanceConfiguration -> MultiMCModpackInstallTask(profile.dependency, selectedFile, modpack.manifest as MultiMCInstanceConfiguration, name).with(MMCInstallVersionSettingTask(profile, modpack.manifest as MultiMCInstanceConfiguration, name))
             else -> throw Error()
-        } with finalizeTask
+        }.with(finalizeTask)
     }
 
     override fun finish(settings: MutableMap<String, Any>): Any? {

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/download/InstallWizardProvider.kt

@@ -2,20 +2,12 @@ package org.jackhuang.hmcl.ui.download
 
 import javafx.scene.Node
 import org.jackhuang.hmcl.download.BMCLAPIDownloadProvider
-import org.jackhuang.hmcl.game.HMCLModpackInstallTask
-import org.jackhuang.hmcl.game.HMCLModpackManifest
 import org.jackhuang.hmcl.game.Version
-import org.jackhuang.hmcl.mod.CurseForgeModpackInstallTask
-import org.jackhuang.hmcl.mod.CurseForgeModpackManifest
 import org.jackhuang.hmcl.mod.Modpack
-import org.jackhuang.hmcl.setting.EnumGameDirectory
 import org.jackhuang.hmcl.setting.Profile
-import org.jackhuang.hmcl.setting.Settings
-import org.jackhuang.hmcl.task.Scheduler
-import org.jackhuang.hmcl.task.Task
-import org.jackhuang.hmcl.task.task
 import org.jackhuang.hmcl.ui.wizard.WizardController
 import org.jackhuang.hmcl.ui.wizard.WizardProvider
+import org.jackhuang.hmcl.util.task
 import java.io.File
 
 class InstallWizardProvider(val profile: Profile, val gameVersion: String, val version: Version, val forge: String? = null, val liteloader: String? = null, val optifine: String? = null): WizardProvider() {
@@ -27,20 +19,20 @@ class InstallWizardProvider(val profile: Profile, val gameVersion: String, val v
         var ret = task {}
 
         if (settings.containsKey("forge"))
-            ret = ret with profile.dependency.installLibraryAsync(gameVersion, version, "forge", settings["forge"] as String)
+            ret = ret.with(profile.dependency.installLibraryAsync(gameVersion, version, "forge", settings["forge"] as String))
 
         if (settings.containsKey("liteloader"))
-            ret = ret with profile.dependency.installLibraryAsync(gameVersion, version, "liteloader", settings["liteloader"] as String)
+            ret = ret.with(profile.dependency.installLibraryAsync(gameVersion, version, "liteloader", settings["liteloader"] as String))
 
         if (settings.containsKey("optifine"))
-            ret = ret with profile.dependency.installLibraryAsync(gameVersion, version, "optifine", settings["optifine"] as String)
+            ret = ret.with(profile.dependency.installLibraryAsync(gameVersion, version, "optifine", settings["optifine"] as String))
 
-        return ret with task { profile.repository.refreshVersions() }
+        return ret.with(task { profile.repository.refreshVersions() })
     }
 
     override fun createPage(controller: WizardController, step: Int, settings: MutableMap<String, Any>): Node {
         return when (step) {
-            0 -> AdditionalInstallersPage(this, controller, profile.repository, BMCLAPIDownloadProvider)
+            0 -> AdditionalInstallersPage(this, controller, profile.repository, BMCLAPIDownloadProvider.INSTANCE)
             else -> throw IllegalStateException()
         }
     }

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/download/VersionsPage.kt

@@ -24,6 +24,7 @@ import javafx.scene.layout.StackPane
 import org.jackhuang.hmcl.download.DownloadProvider
 import org.jackhuang.hmcl.download.RemoteVersion
 import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.Schedulers
 import org.jackhuang.hmcl.task.TaskExecutor
 import org.jackhuang.hmcl.ui.animation.ContainerAnimations
 import org.jackhuang.hmcl.ui.animation.TransitionHandler
@@ -53,9 +54,9 @@ class VersionsPage(private val controller: WizardController, private val gameVer
     }
 
     override fun refresh() {
-        executor = versionList.refreshAsync(downloadProvider).subscribe(Scheduler.JAVAFX) {
+        executor = versionList.refreshAsync(downloadProvider).subscribe(Schedulers.javafx()) {
             val versions = ArrayList(versionList.getVersions(gameVersion))
-            versions.sortWith(RemoteVersion)
+            versions.sortWith(RemoteVersion.RemoteVersionComparator.INSTANCE)
             for (version in versions) {
                 list.items.add(VersionsPageItem(version))
             }

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/export/ExportWizardProvider.kt

@@ -34,10 +34,12 @@ class ExportWizardProvider(private val profile: Profile, private val version: St
         @Suppress("UNCHECKED_CAST")
         return HMCLModpackExportTask(profile.repository, version, settings[ModpackFileSelectionPage.MODPACK_FILE_SELECTION] as List<String>,
                 Modpack(
-                        name = settings[ModpackInfoPage.MODPACK_NAME] as String,
+                        settings[ModpackInfoPage.MODPACK_NAME] as String,
-                        author = settings[ModpackInfoPage.MODPACK_AUTHOR] as String,
+                        settings[ModpackInfoPage.MODPACK_AUTHOR] as String,
-                        version = settings[ModpackInfoPage.MODPACK_VERSION] as String,
+                        settings[ModpackInfoPage.MODPACK_VERSION] as String,
-                        description = settings[ModpackInfoPage.MODPACK_DESCRIPTION] as String
+                        null,
+                        settings[ModpackInfoPage.MODPACK_DESCRIPTION] as String,
+                        null
                 ), settings[ModpackInfoPage.MODPACK_FILE] as File)
     }
 

HMCL/src/main/kotlin/org/jackhuang/hmcl/ui/wizard/AbstractWizardDisplayer.kt

@@ -23,10 +23,7 @@ import javafx.application.Platform
 import javafx.scene.control.Label
 import javafx.scene.layout.StackPane
 import javafx.scene.layout.VBox
-import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.*
-import org.jackhuang.hmcl.task.Task
-import org.jackhuang.hmcl.task.TaskExecutor
-import org.jackhuang.hmcl.task.TaskListener
 import java.util.*
 import kotlin.concurrent.thread
 
@@ -94,28 +91,28 @@ interface AbstractWizardDisplayer : WizardDisplayer {
 
         navigateTo(StackPane().apply { children += vbox }, Navigation.NavigationDirection.FINISH)
 
-        task.with(org.jackhuang.hmcl.task.task(Scheduler.JAVAFX) {
+        task.with(org.jackhuang.hmcl.util.task(Schedulers.javafx()) {
             navigateTo(Label("Successful"), Navigation.NavigationDirection.FINISH)
         }).executor().apply {
             @Suppress("NAME_SHADOWING")
-            taskListener = object : TaskListener {
+            taskListener = object : TaskListener() {
                 override fun onReady(task: Task) {
-                    Platform.runLater { tasksBar.progressProperty().set(finishedTasks * 1.0 / totTask.get()) }
+                    Platform.runLater { tasksBar.progressProperty().set(finishedTasks * 1.0 / runningTasks) }
                 }
 
                 override fun onFinished(task: Task) {
                     Platform.runLater {
-                        label.text = task.title
+                        label.text = task.name
                         ++finishedTasks
-                        tasksBar.progressProperty().set(finishedTasks * 1.0 / totTask.get())
+                        tasksBar.progressProperty().set(finishedTasks * 1.0 / runningTasks)
                     }
                 }
 
                 override fun onFailed(task: Task, throwable: Throwable) {
                     Platform.runLater {
-                        label.text = task.title
+                        label.text = task.name
                         ++finishedTasks
-                        tasksBar.progressProperty().set(finishedTasks * 1.0 / totTask.get())
+                        tasksBar.progressProperty().set(finishedTasks * 1.0 / runningTasks)
                     }
                 }
 

HMCL/src/main/kotlin/org/jackhuang/hmcl/upgrade/AppDataUpgrader.kt

@@ -37,10 +37,12 @@ import java.util.jar.Pack200
 import java.util.jar.JarOutputStream
 import org.jackhuang.hmcl.util.*
 import java.net.URISyntaxException
-import org.jackhuang.hmcl.util.OS
 import org.jackhuang.hmcl.i18n
 import org.jackhuang.hmcl.ui.alert
+import org.jackhuang.hmcl.util.Constants.GSON
+import org.jackhuang.hmcl.util.Logging.LOG
 import org.jackhuang.hmcl.util.VersionNumber
+import java.net.Proxy
 import java.net.URI
 
 class AppDataUpgrader : IUpgrader {
@@ -123,18 +125,18 @@ class AppDataUpgrader : IUpgrader {
                 else {
                     var url = URL_PUBLISH
                     if (map != null)
-                        if (map.containsKey(OS.CURRENT_OS.checkedName))
+                        if (map.containsKey(OperatingSystem.CURRENT_OS.checkedName))
-                            url = map.get(OS.CURRENT_OS.checkedName)!!
+                            url = map.get(OperatingSystem.CURRENT_OS.checkedName)!!
-                        else if (map.containsKey(OS.UNKNOWN.checkedName))
+                        else if (map.containsKey(OperatingSystem.UNKNOWN.checkedName))
-                            url = map.get(OS.UNKNOWN.checkedName)!!
+                            url = map.get(OperatingSystem.UNKNOWN.checkedName)!!
                     try {
                         java.awt.Desktop.getDesktop().browse(URI(url))
                     } catch (e: URISyntaxException) {
                         LOG.log(Level.SEVERE, "Failed to browse uri: " + url, e)
-                        OS.setClipboard(url)
+                        OperatingSystem.setClipboard(url)
                     } catch (e: IOException) {
                         LOG.log(Level.SEVERE, "Failed to browse uri: " + url, e)
-                        OS.setClipboard(url)
+                        OperatingSystem.setClipboard(url)
                     }
 
                 }
@@ -144,16 +146,17 @@ class AppDataUpgrader : IUpgrader {
 
     class AppDataUpgraderPackGzTask(downloadLink: String, private val newestVersion: String, private val expectedHash: String) : Task() {
         private val tempFile: File = File.createTempFile("hmcl", ".pack.gz")
-        override val dependents = listOf(FileDownloadTask(downloadLink.toURL(), tempFile, expectedHash))
+        private val dependents = listOf(FileDownloadTask(downloadLink.toURL(), tempFile, Proxy.NO_PROXY, expectedHash))
+        override fun getDependents() = dependents
 
         init {
-            onDone += { event -> if (event.failed) tempFile.delete() }
+            onDone() += { event -> if (event.isFailed) tempFile.delete() }
         }
 
         override fun execute() {
             val json = HashMap<String, String>()
             var f = getSelf(newestVersion)
-            if (!f.parentFile.makeDirectory())
+            if (!FileUtils.makeDirectory(f.parentFile))
                 throw IOException("Failed to make directories: " + f.parent)
 
             var i = 0
@@ -187,15 +190,15 @@ class AppDataUpgrader : IUpgrader {
     }
 
     class AppDataUpgraderJarTask(downloadLink: String, private val newestVersion: String, expectedHash: String) : Task() {
-        override var title = "Upgrade"
-            set(value) {}
         private val tempFile = File.createTempFile("hmcl", ".jar")
 
         init {
-            onDone += { event -> if (event.failed) tempFile.delete() }
+            name = "Upgrade"
+            onDone() += { event -> if (event.isFailed) tempFile.delete() }
         }
 
-        override val dependents = listOf(FileDownloadTask(downloadLink.toURL(), tempFile, expectedHash))
+        private val dependents = listOf(FileDownloadTask(downloadLink.toURL(), tempFile, Proxy.NO_PROXY, expectedHash))
+        override fun getDependents() = dependents
 
         override fun execute() {
             val json = HashMap<String, String>()

HMCL/src/main/kotlin/org/jackhuang/hmcl/upgrade/UpdateChecker.kt

@@ -21,6 +21,8 @@ import java.io.IOException
 import com.google.gson.JsonSyntaxException
 import org.jackhuang.hmcl.task.TaskResult
 import org.jackhuang.hmcl.util.*
+import org.jackhuang.hmcl.util.Constants.GSON
+import org.jackhuang.hmcl.util.Logging.LOG
 import java.util.logging.Level
 
 
@@ -58,10 +60,10 @@ class UpdateChecker(var base: VersionNumber, var type: String) {
      */
     fun process(showMessage: Boolean): TaskResult<VersionNumber> {
         return object : TaskResult<VersionNumber>() {
-            override val id = "update_checker.process"
+            override fun getId() = "update_checker.process"
             override fun execute() {
                 if (newVersion == null) {
-                    versionString = ("http://huangyuhui.duapp.com/info.php?type=$type").toURL().doGet()
+                    versionString = NetworkUtils.doGet("http://huangyuhui.duapp.com/info.php?type=$type".toURL())
                     newVersion = VersionNumber.asVersion(versionString!!)
                 }
 
@@ -83,12 +85,12 @@ class UpdateChecker(var base: VersionNumber, var type: String) {
     @Synchronized
     fun requestDownloadLink(): TaskResult<Map<String, String>> {
         return object : TaskResult<Map<String, String>>() {
-            override val id = "update_checker.request_download_link"
+            override fun getId() = "update_checker.request_download_link"
             override fun execute() {
                 @Suppress("UNCHECKED_CAST")
                 if (download_link == null)
                     try {
-                        download_link = GSON.fromJson(("http://huangyuhui.duapp.com/update_link.php?type=$type").toURL().doGet(), Map::class.java) as Map<String, String>
+                        download_link = GSON.fromJson(NetworkUtils.doGet("http://huangyuhui.duapp.com/update_link.php?type=$type".toURL()), Map::class.java) as Map<String, String>
                     } catch (e: JsonSyntaxException) {
                         LOG.log(Level.WARNING, "Failed to get update link.", e)
                     } catch (e: IOException) {

HMCL/src/main/kotlin/org/jackhuang/hmcl/util/Lang.kt

@@ -17,10 +17,25 @@
  */
 package org.jackhuang.hmcl.util
 
+import com.google.gson.Gson
+import com.google.gson.JsonParseException
+import com.google.gson.reflect.TypeToken
 import javafx.beans.property.Property
+import javafx.event.Event.fireEvent
+import org.jackhuang.hmcl.event.EventBus
+import org.jackhuang.hmcl.event.EventManager
+import org.jackhuang.hmcl.task.Scheduler
+import org.jackhuang.hmcl.task.Schedulers
+import org.jackhuang.hmcl.task.Task
+import org.jackhuang.hmcl.task.TaskResult
+import org.jackhuang.hmcl.util.Constants.UI_THREAD_SCHEDULER
+import java.io.InputStream
+import java.lang.reflect.Type
+import java.net.URL
+import java.rmi.activation.Activatable.unregister
 import java.util.*
+import java.util.concurrent.Callable
 import java.util.concurrent.atomic.AtomicReference
-import kotlin.collections.HashMap
 
 inline fun ignoreException(func: () -> Unit) {
     try {
@@ -34,28 +49,6 @@ inline fun ignoreThrowable(func: () -> Unit) {
     } catch (ignore: Throwable) {}
 }
 
-fun <K, V> unmodifiableMap(map: Map<K, V>?): Map<K, V>? =
-        if (map == null) null
-        else Collections.unmodifiableMap(map)
-
-fun <K, V> copyMap(map: Map<K, V>?): MutableMap<K, V>? =
-        if (map == null) null
-        else HashMap(map)
-
-fun <T> unmodifiableList(list: List<T>?): List<T>? =
-        if (list == null) null
-        else Collections.unmodifiableList(list)
-
-fun <T> copyList(list: List<T>?): MutableList<T>? =
-        if (list == null) null
-        else LinkedList(list)
-
-fun <T> merge(vararg c: Collection<T>?): List<T> = LinkedList<T>().apply {
-    for (a in c)
-        if (a != null)
-            addAll(a)
-}
-
 fun isBlank(str: String?) = str?.isBlank() ?: true
 fun isNotBlank(str: String?) = !isBlank(str)
 
@@ -84,42 +77,7 @@ fun String.asVersion(): String? {
 
 fun Any?.toStringOrEmpty() = this?.toString().orEmpty()
 
-fun parseParams(addBefore: String, objects: Collection<*>, addAfter: String): String {
+fun String.toURL() = URL(this)
-    return parseParams(addBefore, objects.toTypedArray(), addAfter)
-}
-
-fun parseParams(addBefore: String, objects: Array<*>, addAfter: String): String {
-    return parseParams({ addBefore }, objects, { addAfter })
-}
-
-fun parseParams(beforeFunc: (Any?) -> String, params: Array<*>?, afterFunc: (Any?) -> String): String {
-    if (params == null)
-        return ""
-    val sb = StringBuilder()
-    for (i in params.indices) {
-        val param = params[i]
-        val addBefore = beforeFunc(param)
-        val addAfter = afterFunc(param)
-        if (i > 0)
-            sb.append(addAfter).append(addBefore)
-        if (param == null)
-            sb.append("null")
-        else if (param.javaClass.isArray) {
-            sb.append("[")
-            if (param is Array<*>) {
-                sb.append(parseParams(beforeFunc, param, afterFunc))
-            } else
-                for (j in 0..java.lang.reflect.Array.getLength(param) - 1) {
-                    if (j > 0)
-                        sb.append(addAfter)
-                    sb.append(addBefore).append(java.lang.reflect.Array.get(param, j))
-                }
-            sb.append("]")
-        } else
-            sb.append(addBefore).append(params[i])
-    }
-    return sb.toString()
-}
 
 fun Collection<String>.containsOne(vararg matcher: String): Boolean {
     for (a in this)
@@ -131,9 +89,34 @@ fun Collection<String>.containsOne(vararg matcher: String): Boolean {
 
 fun <T> Property<in T>.updateAsync(newValue: T, update: AtomicReference<T>) {
     if (update.getAndSet(newValue) == null) {
-        UI_THREAD_SCHEDULER {
+        UI_THREAD_SCHEDULER.accept(Runnable {
             val current = update.getAndSet(null)
             this.value = current
-        }
+        })
     }
-}
+}
+
+inline fun <reified T> typeOf(): Type = object : TypeToken<T>() {}.type
+
+inline fun <reified T> Gson.fromJson(json: String): T? = fromJson<T>(json, T::class.java)
+
+inline fun <reified T> Gson.fromJsonQuietly(json: String): T? {
+    try {
+        return fromJson<T>(json)
+    } catch (json: JsonParseException) {
+        return null
+    }
+}
+
+fun task(scheduler: Scheduler = Schedulers.defaultScheduler(), closure: (AutoTypingMap<String>) -> Unit): Task = Task.of(closure, scheduler)
+fun <V> taskResult(id: String, callable: Callable<V>): TaskResult<V> = Task.ofResult(id, callable)
+fun <V> taskResult(id: String, callable: (AutoTypingMap<String>) -> V): TaskResult<V> = Task.ofResult(id, callable)
+
+fun InputStream.readFullyAsString() = IOUtils.readFullyAsString(this)
+inline fun <reified T : EventObject> EventBus.channel() = channel(T::class.java)
+
+operator fun <T : EventObject> EventManager<T>.plusAssign(func: (T) -> Unit) = register(func)
+operator fun <T : EventObject> EventManager<T>.plusAssign(func: () -> Unit) = register(func)
+operator fun <T : EventObject> EventManager<T>.minusAssign(func: (T) -> Unit) = unregister(func)
+operator fun <T : EventObject> EventManager<T>.minusAssign(func: () -> Unit) = unregister(func)
+operator fun <T : EventObject> EventManager<T>.invoke(event: T) = fireEvent(event)

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/Account.java

@@ -0,0 +1,40 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth;
+
+import java.net.Proxy;
+import java.util.Map;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public abstract class Account {
+
+    public abstract String getUsername();
+
+    public AuthInfo logIn() throws AuthenticationException {
+        return logIn(Proxy.NO_PROXY);
+    }
+
+    public abstract AuthInfo logIn(Proxy proxy) throws AuthenticationException;
+
+    public abstract void logOut();
+
+    public abstract Map<Object, Object> toStorage();
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/AccountFactory.java

@@ -15,17 +15,21 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hmcl.task
+package org.jackhuang.hmcl.auth;
+
+import java.util.Map;
 
 /**
- * The tasks that provides a way to execute tasks parallelly.
- * Fails when some of [tasks] failed.
  *
- * @param tasks the tasks that can be executed parallelly.
+ * @author huangyuhui
  */
-class ParallelTask(vararg tasks: Task): Task() {
+public abstract class AccountFactory<T extends Account> {
-    override val hidden: Boolean = true
-    override val dependents: Collection<Task> = listOf(*tasks)
 
-    override fun execute() {}
+    public final T fromUsername(String username) {
-}
+        return fromUsername(username, "");
+    }
+
+    public abstract T fromUsername(String username, String password);
+
+    public abstract T fromStorage(Map<Object, Object> storage);
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/AuthInfo.java

@@ -0,0 +1,96 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth;
+
+import org.jackhuang.hmcl.auth.yggdrasil.GameProfile;
+import org.jackhuang.hmcl.util.UUIDTypeAdapter;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class AuthInfo {
+
+    private final String username;
+    private final String userId;
+    private final String authToken;
+    private final UserType userType;
+    private final String userProperties;
+    private final String userPropertyMap;
+
+    public AuthInfo(String username, String userId, String authToken) {
+        this(username, userId, authToken, UserType.LEGACY);
+    }
+
+    public AuthInfo(String username, String userId, String authToken, UserType userType) {
+        this(username, userId, authToken, userType, "{}");
+    }
+
+    public AuthInfo(String username, String userId, String authToken, UserType userType, String userProperties) {
+        this(username, userId, authToken, userType, userProperties, "{}");
+    }
+
+    public AuthInfo(String username, String userId, String authToken, UserType userType, String userProperties, String userPropertyMap) {
+        this.username = username;
+        this.userId = userId;
+        this.authToken = authToken;
+        this.userType = userType;
+        this.userProperties = userProperties;
+        this.userPropertyMap = userPropertyMap;
+    }
+
+    public AuthInfo(GameProfile profile, String authToken, UserType userType, String userProperties) {
+        this(profile.getName(), UUIDTypeAdapter.fromUUID(profile.getId()), authToken, userType, userProperties);
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getUserId() {
+        return userId;
+    }
+
+    public String getAuthToken() {
+        return authToken;
+    }
+
+    public UserType getUserType() {
+        return userType;
+    }
+
+    /**
+     * Properties of this user.
+     * Don't know the difference between user properties and user property map.
+     *
+     * @return the user property map in JSON.
+     */
+    public String getUserProperties() {
+        return userProperties;
+    }
+
+    /**
+     * Properties of this user.
+     * Don't know the difference between user properties and user property map.
+     *
+     * @return the user property map in JSON.
+     */
+    public String getUserPropertyMap() {
+        return userPropertyMap;
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/AuthenticationException.java

@@ -0,0 +1,37 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public class AuthenticationException extends Exception {
+
+    public AuthenticationException() {
+        super();
+    }
+
+    public AuthenticationException(String message) {
+        super(message);
+    }
+
+    public AuthenticationException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/OfflineAccount.java

@@ -0,0 +1,81 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth;
+
+import java.net.Proxy;
+import java.util.Map;
+import java.util.Objects;
+import org.jackhuang.hmcl.util.Lang;
+import org.jackhuang.hmcl.util.Pair;
+import org.jackhuang.hmcl.util.StringUtils;
+
+/**
+ *
+ * @author huang
+ */
+public class OfflineAccount extends Account {
+
+    private final String username;
+    private final String uuid;
+
+    OfflineAccount(String username, String uuid) {
+        Objects.requireNonNull(username);
+        Objects.requireNonNull(uuid);
+
+        this.username = username;
+        this.uuid = uuid;
+
+        if (StringUtils.isBlank(username))
+            throw new IllegalArgumentException("Username cannot be blank");
+    }
+
+    public String getUuid() {
+        return uuid;
+    }
+
+    @Override
+    public String getUsername() {
+        return username;
+    }
+
+    @Override
+    public AuthInfo logIn(Proxy proxy) throws AuthenticationException {
+        if (StringUtils.isBlank(username) || StringUtils.isBlank(uuid))
+            throw new AuthenticationException("Username cannot be empty");
+
+        return new AuthInfo(username, uuid, uuid);
+    }
+
+    @Override
+    public void logOut() {
+        // Offline account need not log out.
+    }
+
+    @Override
+    public Map<Object, Object> toStorage() {
+        return Lang.mapOf(
+                new Pair<>("uuid", uuid),
+                new Pair<>("username", username)
+        );
+    }
+
+    @Override
+    public String toString() {
+        return "OfflineAccount[username=" + username + ", uuid=" + uuid + "]";
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/OfflineAccountFactory.java

@@ -0,0 +1,55 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth;
+
+import java.util.Map;
+import org.jackhuang.hmcl.util.DigestUtils;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public class OfflineAccountFactory extends AccountFactory<OfflineAccount> {
+    public static final OfflineAccountFactory INSTANCE = new OfflineAccountFactory();
+
+    private OfflineAccountFactory() {
+    }
+
+    @Override
+    public OfflineAccount fromUsername(String username, String password) {
+        return new OfflineAccount(username, getUUIDFromUserName(username));
+    }
+
+    @Override
+    public OfflineAccount fromStorage(Map<Object, Object> storage) {
+        Object username = storage.get("username");
+        if (username == null || !(username instanceof String))
+            throw new IllegalStateException("Offline account configuration malformed.");
+
+        Object uuid = storage.get("uuid");
+        if (uuid == null || !(uuid instanceof String))
+            uuid = getUUIDFromUserName((String) username);
+
+        return new OfflineAccount((String) username, (String) uuid);
+    }
+
+    private static String getUUIDFromUserName(String username) {
+        return DigestUtils.md5Hex(username);
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/UserType.java

@@ -0,0 +1,49 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public enum UserType {
+    LEGACY,
+    MOJANG;
+
+    public static UserType fromName(String name) {
+        return BY_NAME.get(name.toLowerCase());
+    }
+
+    public static UserType fromLegacy(boolean isLegacy) {
+        return isLegacy ? LEGACY : MOJANG;
+    }
+
+    static {
+        HashMap<String, UserType> byName = new HashMap<>();
+        for (UserType type : values())
+            byName.put(type.name().toLowerCase(), type);
+        BY_NAME = Collections.unmodifiableMap(byName);
+    }
+
+    public static final Map<String, UserType> BY_NAME;
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/AuthenticationRequest.java

@@ -0,0 +1,61 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.jackhuang.hmcl.auth.yggdrasil;
+
+import java.util.Map;
+import org.jackhuang.hmcl.util.Lang;
+import org.jackhuang.hmcl.util.Pair;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class AuthenticationRequest {
+
+    /**
+     * The user name of Minecraft account.
+     */
+    private final String username;
+
+    /**
+     * The password of Minecraft account.
+     */
+    private final String password;
+
+    /**
+     * The client token of this game.
+     */
+    private final String clientToken;
+
+    private final Map<String, Object> agent = Lang.mapOf(
+            new Pair("name", "minecraft"),
+            new Pair("version", 1));
+
+    private final boolean requestUser = true;
+
+    public AuthenticationRequest(String username, String password, String clientToken) {
+        this.username = username;
+        this.password = password;
+        this.clientToken = clientToken;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getClientToken() {
+        return clientToken;
+    }
+
+    public Map<String, Object> getAgent() {
+        return agent;
+    }
+
+    public boolean isRequestUser() {
+        return requestUser;
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/GameProfile.java

@@ -0,0 +1,102 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth.yggdrasil;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+import java.lang.reflect.Type;
+import java.util.UUID;
+
+/**
+ *
+ * @author huang
+ */
+public final class GameProfile {
+
+    private final UUID id;
+    private final String name;
+    private final PropertyMap properties;
+    private final boolean legacy;
+
+    public GameProfile() {
+        this(null, null);
+    }
+
+    public GameProfile(UUID id, String name) {
+        this(id, name, new PropertyMap(), false);
+    }
+
+    public GameProfile(UUID id, String name, PropertyMap properties, boolean legacy) {
+        this.id = id;
+        this.name = name;
+        this.properties = properties;
+        this.legacy = legacy;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public PropertyMap getProperties() {
+        return properties;
+    }
+
+    public boolean isLegacy() {
+        return legacy;
+    }
+
+    public static class Serializer implements JsonSerializer<GameProfile>, JsonDeserializer<GameProfile> {
+
+        public static final Serializer INSTANCE = new Serializer();
+
+        private Serializer() {
+        }
+
+        @Override
+        public JsonElement serialize(GameProfile src, Type type, JsonSerializationContext context) {
+            JsonObject result = new JsonObject();
+            if (src.getId() != null)
+                result.add("id", context.serialize(src.getId()));
+            if (src.getName() != null)
+                result.addProperty("name", src.getName());
+            return result;
+        }
+
+        @Override
+        public GameProfile deserialize(JsonElement je, Type type, JsonDeserializationContext context) throws JsonParseException {
+            if (!(je instanceof JsonObject))
+                throw new JsonParseException("The json element is not a JsonObject.");
+
+            JsonObject json = (JsonObject) je;
+
+            UUID id = json.has("id") ? context.deserialize(json.get("id"), UUID.class) : null;
+            String name = json.has("name") ? json.getAsJsonPrimitive("name").getAsString() : null;
+            return new GameProfile(id, name);
+        }
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/InvalidCredentialsException.java

@@ -0,0 +1,37 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth.yggdrasil;
+
+import org.jackhuang.hmcl.auth.AuthenticationException;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class InvalidCredentialsException extends AuthenticationException {
+
+    private final YggdrasilAccount account;
+
+    public InvalidCredentialsException(YggdrasilAccount account) {
+        this.account = account;
+    }
+
+    public YggdrasilAccount getAccount() {
+        return account;
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/InvalidTokenException.java

@@ -15,20 +15,24 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hmcl.auth
+package org.jackhuang.hmcl.auth.yggdrasil;
 
-enum class UserType() {
+import org.jackhuang.hmcl.auth.AuthenticationException;
-    LEGACY,
-    MOJANG;
 
-    companion object {
+/**
+ *
+ * @author huangyuhui
+ */
+public class InvalidTokenException extends AuthenticationException {
 
-        fun fromName(name: String) = BY_NAME[name.toLowerCase()]
+    private YggdrasilAccount account;
-        fun fromLegacy(isLegacy: Boolean) = if (isLegacy) LEGACY else MOJANG
 
-        private val BY_NAME = HashMap<String, UserType>().apply {
+    public InvalidTokenException(YggdrasilAccount account) {
-            for (type in values())
+        super();
-                this[type.name.toLowerCase()] = type
+        this.account = account;
-        }
     }
-}
+
+    public YggdrasilAccount getAccount() {
+        return account;
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/Property.java

@@ -1,7 +1,7 @@
 /*
  * Hello Minecraft! Launcher.
  * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
- * 
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
@@ -15,12 +15,23 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hmcl.task
+package org.jackhuang.hmcl.auth.yggdrasil;
 
-import org.jackhuang.hmcl.util.AutoTypingMap
+public class Property {
 
-internal class SimpleTask @JvmOverloads constructor(private val runnable: (AutoTypingMap<String>) -> Unit, override val scheduler: Scheduler = Scheduler.DEFAULT) : Task() {
+    private final String name;
-    override fun execute() {
+    private final String value;
-        runnable(variables!!)
+
+    public Property(String name, String value) {
+        this.name = name;
+        this.value = value;
     }
-}
+
+    public String getName() {
+        return name;
+    }
+
+    public String getValue() {
+        return value;
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/PropertyMap.java

@@ -0,0 +1,116 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth.yggdrasil;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+import java.lang.reflect.Type;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import org.jackhuang.hmcl.util.Lang;
+
+public final class PropertyMap extends HashMap<String, Property> {
+
+    public List<Map<String, String>> toList() {
+        List<Map<String, String>> properties = new ArrayList<>();
+        for (Property profileProperty : values()) {
+            Map<String, String> property = new HashMap<>();
+            property.put("name", profileProperty.getName());
+            property.put("value", profileProperty.getValue());
+            properties.add(property);
+        }
+        return properties;
+    }
+
+    public void fromList(List<?> list) {
+        for (Object propertyMap : list) {
+            if (!(propertyMap instanceof Map<?, ?>))
+                continue;
+            Optional<String> name = Lang.get((Map<?, ?>) propertyMap, "name", String.class);
+            Optional<String> value = Lang.get((Map<?, ?>) propertyMap, "value", String.class);
+            if (name.isPresent() && value.isPresent())
+                put(name.get(), new Property(name.get(), value.get()));
+        }
+    }
+
+    public static class Serializer implements JsonSerializer<PropertyMap>, JsonDeserializer<PropertyMap> {
+
+        public static final Serializer INSTANCE = new Serializer();
+
+        private Serializer() {
+        }
+
+        @Override
+        public PropertyMap deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
+            PropertyMap result = new PropertyMap();
+            if (json instanceof JsonObject) {
+                for (Map.Entry<String, JsonElement> entry : ((JsonObject) json).entrySet())
+                    if (entry.getValue() instanceof JsonArray)
+                        for (JsonElement element : (JsonArray) entry.getValue())
+                            result.put(entry.getKey(), new Property(entry.getKey(), element.getAsString()));
+            } else if ((json instanceof JsonArray))
+                for (JsonElement element : (JsonArray) json)
+                    if ((element instanceof JsonObject)) {
+                        JsonObject object = (JsonObject) element;
+                        String name = object.getAsJsonPrimitive("name").getAsString();
+                        String value = object.getAsJsonPrimitive("value").getAsString();
+                        result.put(name, new Property(name, value));
+                    }
+
+            return result;
+        }
+
+        @Override
+        public JsonElement serialize(PropertyMap src, Type typeOfSrc, JsonSerializationContext context) {
+            JsonArray result = new JsonArray();
+            for (Property property : src.values()) {
+                JsonObject object = new JsonObject();
+                object.addProperty("name", property.getName());
+                object.addProperty("value", property.getValue());
+                result.add(object);
+            }
+
+            return result;
+        }
+    }
+
+    public static class LegacySerializer
+            implements JsonSerializer<PropertyMap> {
+
+        @Override
+        public JsonElement serialize(PropertyMap src, Type typeOfSrc, JsonSerializationContext context) {
+            JsonObject result = new JsonObject();
+            for (PropertyMap.Entry<String, Property> entry : src.entrySet()) {
+                JsonArray values = new JsonArray();
+                values.add(new JsonPrimitive(entry.getValue().getValue()));
+                result.add(entry.getKey(), values);
+            }
+            return result;
+        }
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/RefreshRequest.java

@@ -0,0 +1,62 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth.yggdrasil;
+
+/**
+ *
+ * @author huang
+ */
+public final class RefreshRequest {
+
+    private final String accessToken;
+    private final String clientToken;
+    private final GameProfile selectedProfile;
+    private final boolean requestUser;
+
+    public RefreshRequest(String accessToken, String clientToken) {
+        this(accessToken, clientToken, null);
+    }
+
+    public RefreshRequest(String accessToken, String clientToken, GameProfile selectedProfile) {
+        this(accessToken, clientToken, selectedProfile, true);
+    }
+
+    public RefreshRequest(String accessToken, String clientToken, GameProfile selectedProfile, boolean requestUser) {
+        this.accessToken = accessToken;
+        this.clientToken = clientToken;
+        this.selectedProfile = selectedProfile;
+        this.requestUser = requestUser;
+    }
+
+    public String getAccessToken() {
+        return accessToken;
+    }
+
+    public String getClientToken() {
+        return clientToken;
+    }
+
+    public GameProfile getSelectedProfile() {
+        return selectedProfile;
+    }
+
+    public boolean isRequestUser() {
+        return requestUser;
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/Response.java

@@ -0,0 +1,82 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth.yggdrasil;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class Response {
+
+    private final String accessToken;
+    private final String clientToken;
+    private final GameProfile selectedProfile;
+    private final GameProfile[] availableProfiles;
+    private final User user;
+    private final String error;
+    private final String errorMessage;
+    private final String cause;
+
+    public Response() {
+        this(null, null, null, null, null, null, null, null);
+    }
+
+    public Response(String accessToken, String clientToken, GameProfile selectedProfile, GameProfile[] availableProfiles, User user, String error, String errorMessage, String cause) {
+        this.accessToken = accessToken;
+        this.clientToken = clientToken;
+        this.selectedProfile = selectedProfile;
+        this.availableProfiles = availableProfiles;
+        this.user = user;
+        this.error = error;
+        this.errorMessage = errorMessage;
+        this.cause = cause;
+    }
+
+    public String getAccessToken() {
+        return accessToken;
+    }
+
+    public String getClientToken() {
+        return clientToken;
+    }
+
+    public GameProfile getSelectedProfile() {
+        return selectedProfile;
+    }
+
+    public GameProfile[] getAvailableProfiles() {
+        return availableProfiles;
+    }
+
+    public User getUser() {
+        return user;
+    }
+
+    public String getError() {
+        return error;
+    }
+
+    public String getErrorMessage() {
+        return errorMessage;
+    }
+
+    public String getCause() {
+        return cause;
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/User.java

@@ -0,0 +1,56 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth.yggdrasil;
+
+import com.google.gson.JsonParseException;
+import org.jackhuang.hmcl.util.StringUtils;
+import org.jackhuang.hmcl.util.Validation;
+
+/**
+ *
+ * @author huang
+ */
+public final class User implements Validation {
+
+    private final String id;
+    private final PropertyMap properties;
+
+    public User(String id) {
+        this(id, null);
+    }
+
+    public User(String id, PropertyMap properties) {
+        this.id = id;
+        this.properties = properties;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public PropertyMap getProperties() {
+        return properties;
+    }
+
+    @Override
+    public void validate() throws JsonParseException {
+        if (StringUtils.isBlank(id))
+            throw new JsonParseException("User id cannot be empty.");
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/ValidateRequest.java

@@ -15,19 +15,28 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hmcl.task
+package org.jackhuang.hmcl.auth.yggdrasil;
 
-import org.jackhuang.hmcl.util.AutoTypingMap
+/**
-import java.util.concurrent.Callable
+ *
+ * @author huangyuhui
+ */
+public final class ValidateRequest {
 
-internal class TaskCallable<V>(override val id: String, private val callable: Callable<V>) : TaskResult<V>() {
+    private final String accessToken;
-    override fun execute() {
+    private final String clientToken;
-        result = callable.call()
+
+    public ValidateRequest(String accessToken, String clientToken) {
+        this.accessToken = accessToken;
+        this.clientToken = clientToken;
     }
+
+    public String getAccessToken() {
+        return accessToken;
+    }
+
+    public String getClientToken() {
+        return clientToken;
+    }
+
 }
-
-internal class TaskCallable2<V>(override val id: String, private val callable: (AutoTypingMap<String>) -> V) : TaskResult<V>() {
-    override fun execute() {
-        result = callable(variables!!)
-    }
-}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/YggdrasilAccount.java

@@ -0,0 +1,274 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth.yggdrasil;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonParseException;
+import java.io.IOException;
+import java.net.Proxy;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import java.util.UUID;
+import org.jackhuang.hmcl.auth.Account;
+import org.jackhuang.hmcl.auth.AuthInfo;
+import org.jackhuang.hmcl.auth.AuthenticationException;
+import org.jackhuang.hmcl.auth.UserType;
+import org.jackhuang.hmcl.util.NetworkUtils;
+import org.jackhuang.hmcl.util.StringUtils;
+import org.jackhuang.hmcl.util.UUIDTypeAdapter;
+
+/**
+ *
+ * @author huang
+ */
+public final class YggdrasilAccount extends Account {
+
+    private final String username;
+    private String password;
+    private String userId;
+    private String accessToken = null;
+    private String clientToken = randomToken();
+    private boolean isOnline = false;
+    private PropertyMap userProperties = new PropertyMap();
+    private GameProfile selectedProfile = null;
+    private GameProfile[] profiles;
+    private UserType userType = UserType.LEGACY;
+
+    public YggdrasilAccount(String username) {
+        this.username = username;
+    }
+
+    @Override
+    public String getUsername() {
+        return username;
+    }
+
+    void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getUserId() {
+        return userId;
+    }
+
+    void setUserId(String userId) {
+        this.userId = userId;
+    }
+
+    void setAccessToken(String accessToken) {
+        this.accessToken = accessToken;
+    }
+
+    String getClientToken() {
+        return clientToken;
+    }
+
+    void setClientToken(String clientToken) {
+        this.clientToken = clientToken;
+    }
+
+    PropertyMap getUserProperties() {
+        return userProperties;
+    }
+
+    public GameProfile getSelectedProfile() {
+        return selectedProfile;
+    }
+
+    void setSelectedProfile(GameProfile selectedProfile) {
+        this.selectedProfile = selectedProfile;
+    }
+
+    public boolean isLoggedIn() {
+        return StringUtils.isNotBlank(accessToken);
+    }
+
+    public boolean canPlayOnline() {
+        return isLoggedIn() && selectedProfile != null && isOnline;
+    }
+
+    public boolean canLogIn() {
+        return !canPlayOnline() && StringUtils.isNotBlank(username)
+                && (StringUtils.isNotBlank(password) || StringUtils.isNotBlank(accessToken));
+    }
+
+    @Override
+    public AuthInfo logIn(Proxy proxy) throws AuthenticationException {
+        if (canPlayOnline())
+            return new AuthInfo(selectedProfile, accessToken, userType, GSON.toJson(userProperties));
+        else {
+            logIn0(proxy);
+            if (!isLoggedIn())
+                throw new AuthenticationException("Wrong password for account " + username);
+
+            if (selectedProfile == null)
+                // TODO: multi-available-profiles support
+                throw new UnsupportedOperationException("Do not support multi-available-profiles account yet.");
+            else
+                return new AuthInfo(selectedProfile, accessToken, userType, GSON.toJson(userProperties));
+        }
+    }
+
+    private void logIn0(Proxy proxy) throws AuthenticationException {
+        if (StringUtils.isNotBlank(accessToken)) {
+            if (StringUtils.isBlank(userId))
+                if (StringUtils.isNotBlank(username))
+                    userId = username;
+                else
+                    throw new AuthenticationException("Invalid uuid and username");
+            if (checkTokenValidity(proxy)) {
+                isOnline = true;
+                return;
+            }
+            logIn1(ROUTE_REFRESH, new RefreshRequest(accessToken, clientToken), proxy);
+        } else if (StringUtils.isNotBlank(password))
+            logIn1(ROUTE_AUTHENTICATE, new AuthenticationRequest(username, password, clientToken), proxy);
+        else
+            throw new AuthenticationException("Password cannot be blank");
+    }
+
+    private void logIn1(URL url, Object input, Proxy proxy) throws AuthenticationException {
+        Response response = makeRequest(url, input, proxy);
+        if (response == null || !clientToken.equals(response.getClientToken()))
+            throw new AuthenticationException("Client token changed");
+
+        if (response.getSelectedProfile() != null)
+            userType = UserType.fromLegacy(response.getSelectedProfile().isLegacy());
+        else if (response.getAvailableProfiles() != null && response.getAvailableProfiles().length > 0)
+            userType = UserType.fromLegacy(response.getAvailableProfiles()[0].isLegacy());
+
+        User user = response.getUser();
+        if (user == null || user.getId() == null)
+            userId = null;
+        else
+            userId = user.getId();
+
+        isOnline = true;
+        profiles = response.getAvailableProfiles();
+        selectedProfile = response.getSelectedProfile();
+        userProperties.clear();
+        accessToken = response.getAccessToken();
+
+        if (user != null && user.getProperties() != null)
+            userProperties.putAll(user.getProperties());
+    }
+
+    @Override
+    public void logOut() {
+        password = null;
+        userId = null;
+        accessToken = null;
+        isOnline = false;
+        userProperties.clear();
+        profiles = null;
+        selectedProfile = null;
+    }
+
+    @Override
+    public Map<Object, Object> toStorage() {
+        HashMap<Object, Object> result = new HashMap<>();
+
+        result.put(STORAGE_KEY_USER_NAME, getUsername());
+        result.put(STORAGE_KEY_CLIENT_TOKEN, getClientToken());
+        if (getUserId() != null)
+            result.put(STORAGE_KEY_USER_ID, getUserId());
+        if (!userProperties.isEmpty())
+            result.put(STORAGE_KEY_USER_PROPERTIES, userProperties.toList());
+        GameProfile profile = selectedProfile;
+        if (profile != null && profile.getName() != null && profile.getId() != null) {
+            result.put(STORAGE_KEY_PROFILE_NAME, profile.getName());
+            result.put(STORAGE_KEY_PROFILE_ID, profile.getId());
+
+            if (!profile.getProperties().isEmpty())
+                result.put(STORAGE_KEY_PROFILE_PROPERTIES, profile.getProperties().toList());
+        }
+
+        if (StringUtils.isNotBlank(accessToken))
+            result.put(STORAGE_KEY_ACCESS_TOKEN, accessToken);
+
+        return result;
+    }
+
+    private Response makeRequest(URL url, Object input, Proxy proxy) throws AuthenticationException {
+        try {
+            String jsonResult = input == null ? NetworkUtils.doGet(url, proxy) : NetworkUtils.doPost(url, GSON.toJson(input), "application/json", proxy);
+            Response response = GSON.fromJson(jsonResult, Response.class);
+            if (response == null)
+                return null;
+            if (!StringUtils.isBlank(response.getError())) {
+                if (response.getErrorMessage() != null)
+                    if (response.getErrorMessage().contains("Invalid credentials"))
+                        throw new InvalidCredentialsException(this);
+                    else if (response.getErrorMessage().contains("Invalid token"))
+                        throw new InvalidTokenException(this);
+                throw new AuthenticationException(response.getError() + ": " + response.getErrorMessage());
+            }
+
+            return response;
+        } catch (IOException e) {
+            throw new AuthenticationException("Unable to connect to authentication server", e);
+        } catch (JsonParseException e) {
+            throw new AuthenticationException("Unable to parse server response", e);
+        }
+    }
+
+    private boolean checkTokenValidity(Proxy proxy) {
+        if (accessToken == null)
+            return false;
+
+        try {
+            makeRequest(ROUTE_VALIDATE, new ValidateRequest(accessToken, clientToken), proxy);
+            return true;
+        } catch (AuthenticationException e) {
+            return false;
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "YggdrasilAccount[username=" + getUsername() + "]";
+    }
+
+    private static final String BASE_URL = "https://authserver.mojang.com/";
+    private static final URL ROUTE_AUTHENTICATE = NetworkUtils.toURL(BASE_URL + "authenticate");
+    private static final URL ROUTE_REFRESH = NetworkUtils.toURL(BASE_URL + "refresh");
+    private static final URL ROUTE_VALIDATE = NetworkUtils.toURL(BASE_URL + "validate");
+
+    static final String STORAGE_KEY_ACCESS_TOKEN = "accessToken";
+    static final String STORAGE_KEY_PROFILE_NAME = "displayName";
+    static final String STORAGE_KEY_PROFILE_ID = "uuid";
+    static final String STORAGE_KEY_PROFILE_PROPERTIES = "profileProperties";
+    static final String STORAGE_KEY_USER_NAME = "username";
+    static final String STORAGE_KEY_USER_ID = "userid";
+    static final String STORAGE_KEY_USER_PROPERTIES = "userProperties";
+    static final String STORAGE_KEY_CLIENT_TOKEN = "clientToken";
+
+    public static String randomToken() {
+        return UUIDTypeAdapter.fromUUID(UUID.randomUUID());
+    }
+
+    private static final Gson GSON = new GsonBuilder()
+            .registerTypeAdapter(GameProfile.class, GameProfile.Serializer.INSTANCE)
+            .registerTypeAdapter(PropertyMap.class, PropertyMap.Serializer.INSTANCE)
+            .registerTypeAdapter(UUID.class, UUIDTypeAdapter.INSTANCE)
+            .create();
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/YggdrasilAccountFactory.java

@@ -0,0 +1,70 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.auth.yggdrasil;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import org.jackhuang.hmcl.auth.AccountFactory;
+import org.jackhuang.hmcl.util.Lang;
+import static org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccount.*;
+import org.jackhuang.hmcl.util.UUIDTypeAdapter;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class YggdrasilAccountFactory extends AccountFactory<YggdrasilAccount> {
+    public static final YggdrasilAccountFactory INSTANCE = new YggdrasilAccountFactory();
+
+    private YggdrasilAccountFactory() {
+    }
+
+    @Override
+    public YggdrasilAccount fromUsername(String username, String password) {
+        YggdrasilAccount account = new YggdrasilAccount(username);
+        account.setPassword(password);
+        return account;
+    }
+
+    @Override
+    public YggdrasilAccount fromStorage(Map<Object, Object> storage) {
+        String username = Lang.get(storage, STORAGE_KEY_USER_NAME, String.class)
+                .orElseThrow(() -> new IllegalArgumentException("storage does not have key " + STORAGE_KEY_USER_NAME));
+
+        YggdrasilAccount account = new YggdrasilAccount(username);
+        account.setUserId(Lang.get(storage, STORAGE_KEY_USER_ID, String.class, username));
+        account.setAccessToken(Lang.get(storage, STORAGE_KEY_ACCESS_TOKEN, String.class, null));
+        account.setClientToken(Lang.get(storage, STORAGE_KEY_CLIENT_TOKEN, String.class)
+                .orElseThrow(() -> new IllegalArgumentException("storage does not have key " + STORAGE_KEY_CLIENT_TOKEN)));
+
+        Lang.get(storage, STORAGE_KEY_USER_PROPERTIES, List.class)
+                .ifPresent(account.getUserProperties()::fromList);
+        Optional<String> profileId = Lang.get(storage, STORAGE_KEY_PROFILE_ID, String.class);
+        Optional<String> profileName = Lang.get(storage, STORAGE_KEY_PROFILE_NAME, String.class);
+        GameProfile profile = null;
+        if (profileId.isPresent() && profileName.isPresent()) {
+            profile = new GameProfile(UUIDTypeAdapter.fromString(profileId.get()), profileName.get());
+            Lang.get(storage, STORAGE_KEY_PROFILE_PROPERTIES, List.class)
+                    .ifPresent(profile.getProperties()::fromList);
+        }
+        account.setSelectedProfile(profile);
+        return account;
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/AbstractDependencyManager.java

@@ -15,14 +15,18 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hmcl.download
+package org.jackhuang.hmcl.download;
 
-abstract class AbstractDependencyManager
+/**
-    : DependencyManager {
+ *
-    abstract val downloadProvider: DownloadProvider
+ * @author huangyuhui
+ */
+public abstract class AbstractDependencyManager implements DependencyManager {
 
-    override fun getVersionList(id: String): VersionList<*> {
+    public abstract DownloadProvider getDownloadProvider();
-        return downloadProvider.getVersionListById(id)
+
+    @Override
+    public VersionList<?> getVersionList(String id) {
+        return getDownloadProvider().getVersionListById(id);
     }
-
+}
-}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/BMCLAPIDownloadProvider.java

@@ -0,0 +1,88 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download;
+
+import org.jackhuang.hmcl.download.forge.ForgeVersionList;
+import org.jackhuang.hmcl.download.game.GameVersionList;
+import org.jackhuang.hmcl.download.liteloader.LiteLoaderVersionList;
+import org.jackhuang.hmcl.download.optifine.OptiFineBMCLVersionList;
+
+/**
+ *
+ * @author huang
+ */
+public class BMCLAPIDownloadProvider implements DownloadProvider {
+
+    public static final BMCLAPIDownloadProvider INSTANCE = new BMCLAPIDownloadProvider();
+
+    private BMCLAPIDownloadProvider() {
+    }
+
+    @Override
+    public String getLibraryBaseURL() {
+        return "http://bmclapi2.bangbang93.com/libraries/";
+    }
+
+    @Override
+    public String getVersionListURL() {
+        return "http://bmclapi2.bangbang93.com/mc/game/version_manifest.json";
+    }
+
+    @Override
+    public String getVersionBaseURL() {
+        return "http://bmclapi2.bangbang93.com/versions/";
+    }
+
+    @Override
+    public String getAssetIndexBaseURL() {
+        return "http://bmclapi2.bangbang93.com/indexes/";
+    }
+
+    @Override
+    public String getAssetBaseURL() {
+        return "http://bmclapi2.bangbang93.com/assets/";
+    }
+
+    @Override
+    public VersionList<?> getVersionListById(String id) {
+        switch (id) {
+            case "game":
+                return GameVersionList.INSTANCE;
+            case "forge":
+                return ForgeVersionList.INSTANCE;
+            case "liteloader":
+                return LiteLoaderVersionList.INSTANCE;
+            case "optifine":
+                return OptiFineBMCLVersionList.INSTANCE;
+            default:
+                throw new IllegalArgumentException("Unrecognized version list id: " + id);
+        }
+    }
+
+    @Override
+    public String injectURL(String baseURL) {
+        return baseURL
+                .replace("https://launchermeta.mojang.com", "https://bmclapi2.bangbang93.com")
+                .replace("https://launcher.mojang.com", "https://bmclapi2.bangbang93.com")
+                .replace("https://libraries.minecraft.net", "https://bmclapi2.bangbang93.com/libraries")
+                .replace("http://files.minecraftforge.net/maven", "https://bmclapi2.bangbang93.com/maven")
+                .replace("http://dl.liteloader.com/versions/versions.json", "https://bmclapi2.bangbang93.com/maven/com/mumfrey/liteloader/versions.json")
+                .replace("http://dl.liteloader.com/versions", "https://bmclapi2.bangbang93.com/maven");
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/DefaultDependencyManager.java

@@ -0,0 +1,100 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download;
+
+import java.net.Proxy;
+import org.jackhuang.hmcl.download.forge.ForgeInstallTask;
+import org.jackhuang.hmcl.download.game.GameAssetDownloadTask;
+import org.jackhuang.hmcl.download.game.GameLibrariesTask;
+import org.jackhuang.hmcl.download.game.GameLoggingDownloadTask;
+import org.jackhuang.hmcl.download.game.VersionJsonSaveTask;
+import org.jackhuang.hmcl.download.liteloader.LiteLoaderInstallTask;
+import org.jackhuang.hmcl.download.optifine.OptiFineInstallTask;
+import org.jackhuang.hmcl.game.DefaultGameRepository;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.task.ParallelTask;
+import org.jackhuang.hmcl.task.Task;
+
+/**
+ * Note: This class has no state.
+ *
+ * @author huangyuhui
+ */
+public class DefaultDependencyManager extends AbstractDependencyManager {
+
+    private final DefaultGameRepository repository;
+    private final DownloadProvider downloadProvider;
+    private final Proxy proxy;
+
+    public DefaultDependencyManager(DefaultGameRepository repository, DownloadProvider downloadProvider) {
+        this(repository, downloadProvider, Proxy.NO_PROXY);
+    }
+
+    public DefaultDependencyManager(DefaultGameRepository repository, DownloadProvider downloadProvider, Proxy proxy) {
+        this.repository = repository;
+        this.downloadProvider = downloadProvider;
+        this.proxy = proxy;
+    }
+
+    @Override
+    public DefaultGameRepository getGameRepository() {
+        return repository;
+    }
+
+    @Override
+    public DownloadProvider getDownloadProvider() {
+        return downloadProvider;
+    }
+
+    @Override
+    public Proxy getProxy() {
+        return proxy;
+    }
+
+    @Override
+    public GameBuilder gameBuilder() {
+        return new DefaultGameBuilder(this);
+    }
+
+    @Override
+    public Task checkGameCompletionAsync(Version version) {
+        return new ParallelTask(
+                new GameAssetDownloadTask(this, version),
+                new GameLoggingDownloadTask(this, version),
+                new GameLibrariesTask(this, version)
+        );
+    }
+
+    @Override
+    public Task installLibraryAsync(String gameVersion, Version version, String libraryId, String libraryVersion) {
+        switch (libraryId) {
+            case "forge":
+                return new ForgeInstallTask(this, gameVersion, version, libraryVersion)
+                        .then(variables -> new VersionJsonSaveTask(repository, variables.get("version")));
+            case "liteloader":
+                return new LiteLoaderInstallTask(this, gameVersion, version, libraryVersion)
+                        .then(variables -> new VersionJsonSaveTask(repository, variables.get("version")));
+            case "optifine":
+                return new OptiFineInstallTask(this, gameVersion, version, libraryVersion)
+                        .then(variables -> new VersionJsonSaveTask(repository, variables.get("version")));
+            default:
+                throw new IllegalArgumentException("Library id " + libraryId + " is unrecognized.");
+        }
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/DefaultGameBuilder.java

@@ -0,0 +1,74 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download;
+
+import java.util.function.Function;
+import org.jackhuang.hmcl.download.game.GameAssetDownloadTask;
+import org.jackhuang.hmcl.download.game.GameDownloadTask;
+import org.jackhuang.hmcl.download.game.GameLibrariesTask;
+import org.jackhuang.hmcl.download.game.GameLoggingDownloadTask;
+import org.jackhuang.hmcl.download.game.VersionJsonDownloadTask;
+import org.jackhuang.hmcl.download.game.VersionJsonSaveTask;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.task.ParallelTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.AutoTypingMap;
+import org.jackhuang.hmcl.util.Constants;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public class DefaultGameBuilder extends GameBuilder {
+
+    private final DefaultDependencyManager dependencyManager;
+    private final DownloadProvider downloadProvider;
+
+    public DefaultGameBuilder(DefaultDependencyManager dependencyManager) {
+        this.dependencyManager = dependencyManager;
+        this.downloadProvider = dependencyManager.getDownloadProvider();
+    }
+
+    @Override
+    public Task buildAsync() {
+        return new VersionJsonDownloadTask(gameVersion, dependencyManager).then(variables -> {
+            Version version = Constants.GSON.fromJson(variables.<String>get(VersionJsonDownloadTask.ID), Version.class);
+            variables.set("version", version);
+            version = version.setId(name).setJar(null);
+            Task result = new ParallelTask(
+                    new GameAssetDownloadTask(dependencyManager, version),
+                    new GameLoggingDownloadTask(dependencyManager, version),
+                    new GameDownloadTask(dependencyManager, version),
+                    new GameLibrariesTask(dependencyManager, version) // Game libraries will be downloaded for multiple times partly, this time is for vanilla libraries.
+            ).with(new VersionJsonSaveTask(dependencyManager.getGameRepository(), version)); // using [with] because download failure here are tolerant.
+            
+            if (toolVersions.containsKey("forge"))
+                result = result.then(libraryTaskHelper(gameVersion, "forge"));
+            if (toolVersions.containsKey("liteloader"))
+                result = result.then(libraryTaskHelper(gameVersion, "liteloader"));
+            if (toolVersions.containsKey("optifine"))
+                result = result.then(libraryTaskHelper(gameVersion, "optifine"));
+            return result;
+        });
+    }
+
+    private Function<AutoTypingMap<String>, Task> libraryTaskHelper(String gameVersion, String libraryId) {
+        return variables -> dependencyManager.installLibraryAsync(gameVersion, variables.get("version"), libraryId, toolVersions.get(libraryId));
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/DependencyManager.java

@@ -15,27 +15,30 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hmcl.download
+package org.jackhuang.hmcl.download;
 
-import org.jackhuang.hmcl.game.GameRepository
+import java.net.Proxy;
-import org.jackhuang.hmcl.game.Version
+import org.jackhuang.hmcl.game.GameRepository;
-import org.jackhuang.hmcl.task.Task
+import org.jackhuang.hmcl.game.Version;
-import java.net.Proxy
+import org.jackhuang.hmcl.task.Task;
 
 /**
  * Do everything that will connect to Internet.
  * Downloading Minecraft files.
+ *
+ * @author huangyuhui
  */
-interface DependencyManager {
+public interface DependencyManager {
+
     /**
      * The relied game repository.
      */
-    val repository: GameRepository
+    GameRepository getGameRepository();
 
     /**
      * The proxy that all network operations should go through.
      */
-    val proxy: Proxy
+    Proxy getProxy();
 
     /**
      * Check if the game is complete.
@@ -43,12 +46,12 @@ interface DependencyManager {
      *
      * @return the task to check game completion.
      */
-    fun checkGameCompletionAsync(version: Version): Task
+    Task checkGameCompletionAsync(Version version);
 
     /**
      * The builder to build a brand new game then libraries such as Forge, LiteLoader and OptiFine.
      */
-    fun gameBuilder(): GameBuilder
+    GameBuilder gameBuilder();
 
     /**
      * Install a library to a version.
@@ -60,7 +63,7 @@ interface DependencyManager {
      * @param libraryVersion the version of being installed library.
      * @return the task to install the specific library.
      */
-    fun installLibraryAsync(gameVersion: String, version: Version, libraryId: String, libraryVersion: String): Task
+    Task installLibraryAsync(String gameVersion, Version version, String libraryId, String libraryVersion);
 
     /**
      * Get registered version list.
@@ -68,5 +71,5 @@ interface DependencyManager {
      * @param id the id of version list. i.e. game, forge, liteloader, optifine
      * @throws IllegalArgumentException if the version list of specific id is not found.
      */
-    fun getVersionList(id: String): VersionList<*>
+    VersionList<?> getVersionList(String id);
-}
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/DownloadProvider.java

@@ -15,17 +15,24 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hmcl.download
+package org.jackhuang.hmcl.download;
 
 /**
  * The service provider that provides Minecraft online file downloads.
+ *
+ * @author huangyuhui
  */
-interface DownloadProvider {
+public interface DownloadProvider {
-    val libraryBaseURL: String
+
-    val versionListURL: String
+    String getLibraryBaseURL();
-    val versionBaseURL: String
+
-    val assetIndexBaseURL: String
+    String getVersionListURL();
-    val assetBaseURL: String
+
+    String getVersionBaseURL();
+
+    String getAssetIndexBaseURL();
+
+    String getAssetBaseURL();
 
     /**
      * Inject into original URL provided by Mojang and Forge.
@@ -36,12 +43,13 @@ interface DownloadProvider {
      * @param baseURL original URL provided by Mojang and Forge.
      * @return the URL that is equivalent to [baseURL], but belongs to your own service provider.
      */
-    fun injectURL(baseURL: String): String
+    String injectURL(String baseURL);
 
     /**
      * the specific version list that this download provider provides. i.e. "forge", "liteloader", "game", "optifine"
+     *
      * @param id the id of specific version list that this download provider provides. i.e. "forge", "liteloader", "game", "optifine"
      * @return the version list
      */
-    fun getVersionListById(id: String): VersionList<*>
+    VersionList<?> getVersionListById(String id);
-}
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/GameBuilder.java

@@ -15,45 +15,57 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hmcl.download
+package org.jackhuang.hmcl.download;
 
-import org.jackhuang.hmcl.task.Task
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import org.jackhuang.hmcl.task.Task;
 
 /**
  * The builder which provide a task to build Minecraft environment.
  *
  * @author huangyuhui
  */
-abstract class GameBuilder {
+public abstract class GameBuilder {
-    var name: String = ""
+
-    protected var gameVersion: String = ""
+    protected String name = "";
-    protected var toolVersions = HashMap<String, String>()
+    protected String gameVersion = "";
+    protected Map<String, String> toolVersions = new HashMap<>();
+
+    public String getName() {
+        return name;
+    }
 
     /**
      * The new game version name, for .minecraft/<version name>.
+     *
      * @param name the name of new game version.
      */
-    fun name(name: String): GameBuilder {
+    public GameBuilder name(String name) {
-        this.name = name
+        this.name = Objects.requireNonNull(name);
-        return this
+        return this;
     }
 
-    fun gameVersion(version: String): GameBuilder {
+    public GameBuilder gameVersion(String version) {
-        gameVersion = version
+        this.gameVersion = Objects.requireNonNull(version);
-        return this
+        return this;
     }
 
     /**
      * @param id the core library id. i.e. "forge", "liteloader", "optifine"
      * @param version the version of the core library. For documents, you can first try [VersionList.versions]
      */
-    fun version(id: String, version: String): GameBuilder {
+    public GameBuilder version(String id, String version) {
-        toolVersions[id] = version
+        if ("game".equals(id))
-        return this
+            gameVersion(version);
+        else
+            toolVersions.put(id, version);
+        return this;
     }
 
     /**
      * @return the task that can build thw whole Minecraft environment
      */
-    abstract fun buildAsync(): Task
+    public abstract Task buildAsync();
-}
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/MojangDownloadProvider.java

@@ -0,0 +1,84 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download;
+
+import org.jackhuang.hmcl.download.forge.ForgeVersionList;
+import org.jackhuang.hmcl.download.game.GameVersionList;
+import org.jackhuang.hmcl.download.liteloader.LiteLoaderVersionList;
+import org.jackhuang.hmcl.download.optifine.OptiFineVersionList;
+
+/**
+ * @see {@link http://wiki.vg}
+ * @author huangyuhui
+ */
+public final class MojangDownloadProvider implements DownloadProvider {
+
+    public static final MojangDownloadProvider INSTANCE = new MojangDownloadProvider();
+
+    private MojangDownloadProvider() {
+    }
+
+    @Override
+    public String getLibraryBaseURL() {
+        return "https://libraries.minecraft.net/";
+    }
+
+    @Override
+    public String getVersionListURL() {
+        return "https://launchermeta.mojang.com/mc/game/version_manifest.json";
+    }
+
+    @Override
+    public String getVersionBaseURL() {
+        return "http://s3.amazonaws.com/Minecraft.Download/versions/";
+    }
+
+    @Override
+    public String getAssetIndexBaseURL() {
+        return "http://s3.amazonaws.com/Minecraft.Download/indexes/";
+    }
+
+    @Override
+    public String getAssetBaseURL() {
+        return "http://resources.download.minecraft.net/";
+    }
+
+    @Override
+    public VersionList<?> getVersionListById(String id) {
+        switch (id) {
+            case "game":
+                return GameVersionList.INSTANCE;
+            case "forge":
+                return ForgeVersionList.INSTANCE;
+            case "liteloader":
+                return LiteLoaderVersionList.INSTANCE;
+            case "optifine":
+                return OptiFineVersionList.INSTANCE;
+            default:
+                throw new IllegalArgumentException("Unrecognized version list id: " + id);
+        }
+    }
+
+    @Override
+    public String injectURL(String baseURL) {
+        if (baseURL.contains("net/minecraftforge/forge"))
+            return baseURL;
+        else
+            return baseURL.replace("http://files.minecraftforge.net/maven", "http://ftb.cursecdn.com/FTB2/maven");
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/RemoteVersion.java

@@ -0,0 +1,96 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download;
+
+import java.util.Comparator;
+import java.util.Objects;
+import org.jackhuang.hmcl.util.VersionNumber;
+
+/**
+ * The remote version.
+ *
+ * @author huangyuhui
+ */
+public final class RemoteVersion<T> implements Comparable<RemoteVersion<T>> {
+
+    private final String gameVersion;
+    private final String selfVersion;
+    private final String url;
+    private final T tag;
+
+    /**
+     * Constructor.
+     *
+     * @param gameVersion the Minecraft version that this remote version suits.
+     * @param selfVersion the version string of the remote version.
+     * @param url the installer or universal jar URL.
+     * @param tag some necessary information for Installer Task.
+     */
+    public RemoteVersion(String gameVersion, String selfVersion, String url, T tag) {
+        this.gameVersion = Objects.requireNonNull(gameVersion);
+        this.selfVersion = Objects.requireNonNull(selfVersion);
+        this.url = Objects.requireNonNull(url);
+        this.tag = tag;
+    }
+
+    public String getGameVersion() {
+        return gameVersion;
+    }
+
+    public String getSelfVersion() {
+        return selfVersion;
+    }
+
+    public T getTag() {
+        return tag;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof RemoteVersion && Objects.equals(selfVersion, ((RemoteVersion) obj).selfVersion);
+    }
+
+    @Override
+    public int hashCode() {
+        return selfVersion.hashCode();
+    }
+
+    @Override
+    public int compareTo(RemoteVersion<T> o) {
+        // newer versions are smaller than older versions
+        return -selfVersion.compareTo(o.selfVersion);
+    }
+
+    public static class RemoteVersionComparator implements Comparator<RemoteVersion<?>> {
+
+        public static final RemoteVersionComparator INSTANCE = new RemoteVersionComparator();
+
+        private RemoteVersionComparator() {
+        }
+
+        @Override
+        public int compare(RemoteVersion<?> o1, RemoteVersion<?> o2) {
+            return -VersionNumber.asVersion(o1.selfVersion).compareTo(VersionNumber.asVersion(o2.selfVersion));
+        }
+
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/VersionList.java

@@ -15,39 +15,48 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hmcl.download
+package org.jackhuang.hmcl.download;
 
-import org.jackhuang.hmcl.task.Task
+import java.util.Collection;
-import org.jackhuang.hmcl.util.SimpleMultimap
+import java.util.Collections;
-import java.util.*
+import java.util.HashMap;
-import kotlin.collections.HashMap
+import java.util.Optional;
+import java.util.TreeSet;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.SimpleMultimap;
 
 /**
  * The remote version list.
- * @param T The type of RemoteVersion<T>, the type of tags.
+ *
+ * @param T The type of {@code RemoteVersion<T>}, the type of tags.
+ *
+ * @author huangyuhui
  */
-abstract class VersionList<T> {
+public abstract class VersionList<T> {
+
     /**
      * the remote version list.
      * key: game version.
      * values: corresponding remote versions.
      */
-    protected val versions = SimpleMultimap<String, RemoteVersion<T>>(::HashMap, ::TreeSet)
+    protected final SimpleMultimap<String, RemoteVersion<T>> versions = new SimpleMultimap<String, RemoteVersion<T>>(HashMap::new, TreeSet::new);
 
     /**
      * True if the version list has been loaded.
      */
-    val loaded = versions.isNotEmpty
+    public boolean isLoaded() {
+        return !versions.isEmpty();
+    }
 
     /**
      * @param downloadProvider DownloadProvider
      * @return the task to reload the remote version list.
      */
-    abstract fun refreshAsync(downloadProvider: DownloadProvider): Task
+    public abstract Task refreshAsync(DownloadProvider downloadProvider);
 
-    private fun getVersionsImpl(gameVersion: String): Collection<RemoteVersion<T>> {
+    private Collection<RemoteVersion<T>> getVersionsImpl(String gameVersion) {
-        val ans = versions[gameVersion]
+        Collection<RemoteVersion<T>> ans = versions.get(gameVersion);
-        return if (ans.isEmpty()) versions.values else ans
+        return ans.isEmpty() ? versions.values() : ans;
     }
 
     /**
@@ -56,8 +65,8 @@ abstract class VersionList<T> {
      * @param gameVersion the Minecraft version that remote versions belong to
      * @return the collection of specific remote versions
      */
-    fun getVersions(gameVersion: String): Collection<RemoteVersion<T>> {
+    public final Collection<RemoteVersion<T>> getVersions(String gameVersion) {
-        return Collections.unmodifiableCollection(getVersionsImpl(gameVersion))
+        return Collections.unmodifiableCollection(getVersionsImpl(gameVersion));
     }
 
     /**
@@ -67,13 +76,11 @@ abstract class VersionList<T> {
      * @param remoteVersion the version of the remote version.
      * @return the specific remote version, null if it is not found.
      */
-    fun getVersion(gameVersion: String, remoteVersion: String): RemoteVersion<T>? {
+    public final Optional<RemoteVersion<T>> getVersion(String gameVersion, String remoteVersion) {
-        var result : RemoteVersion<T>? = null
+        RemoteVersion<T> result = null;
-        versions[gameVersion].forEach {
+        for (RemoteVersion<T> it : versions.get(gameVersion))
-            if (it.selfVersion == remoteVersion)
+            if (remoteVersion.equals(it.getSelfVersion()))
-                result = it
+                result = it;
-        }
+        return Optional.ofNullable(result);
-        return result
     }
-
+}
-}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/forge/ForgeInstallTask.java

@@ -0,0 +1,140 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.forge;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+import org.jackhuang.hmcl.download.DefaultDependencyManager;
+import org.jackhuang.hmcl.download.RemoteVersion;
+import org.jackhuang.hmcl.download.VersionList;
+import org.jackhuang.hmcl.download.game.GameLibrariesTask;
+import org.jackhuang.hmcl.game.Library;
+import org.jackhuang.hmcl.game.SimpleVersionProvider;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.task.FileDownloadTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.task.TaskResult;
+import org.jackhuang.hmcl.util.Constants;
+import org.jackhuang.hmcl.util.FileUtils;
+import org.jackhuang.hmcl.util.IOUtils;
+import org.jackhuang.hmcl.util.NetworkUtils;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class ForgeInstallTask extends TaskResult<Version> {
+
+    private final DefaultDependencyManager dependencyManager;
+    private final String gameVersion;
+    private final Version version;
+    private final String remoteVersion;
+    private final VersionList<?> forgeVersionList;
+    private final File installer = new File("forge-installer.jar").getAbsoluteFile();
+    private RemoteVersion<?> remote;
+    private final List<Task> dependents = new LinkedList<>();
+    private final List<Task> dependencies = new LinkedList<>();
+
+    private Task downloadFileTask() {
+        remote = forgeVersionList.getVersion(gameVersion, remoteVersion)
+                .orElseThrow(() -> new IllegalArgumentException("Remote forge version " + gameVersion + ", " + remoteVersion + " not found"));
+        return new FileDownloadTask(NetworkUtils.toURL(remote.getUrl()), installer);
+    }
+
+    public ForgeInstallTask(DefaultDependencyManager dependencyManager, String gameVersion, Version version, String remoteVersion) {
+        this.dependencyManager = dependencyManager;
+        this.gameVersion = gameVersion;
+        this.version = version;
+        this.remoteVersion = remoteVersion;
+
+        forgeVersionList = dependencyManager.getVersionList("forge");
+
+        if (!forgeVersionList.isLoaded())
+            dependents.add(forgeVersionList.refreshAsync(dependencyManager.getDownloadProvider())
+                    .then(s -> downloadFileTask()));
+        else
+            dependents.add(downloadFileTask());
+    }
+
+    @Override
+    public Collection<Task> getDependents() {
+        return dependents;
+    }
+
+    @Override
+    public List<Task> getDependencies() {
+        return dependencies;
+    }
+
+    @Override
+    public String getId() {
+        return "version";
+    }
+
+    @Override
+    public boolean isRelyingOnDependencies() {
+        return false;
+    }
+
+    @Override
+    public void execute() throws Exception {
+        try (ZipFile zipFile = new ZipFile(installer)) {
+            InputStream stream = zipFile.getInputStream(zipFile.getEntry("install_profile.json"));
+            if (stream == null)
+                throw new IOException("Malformed forge installer file, install_profile.json does not exist.");
+            String json = IOUtils.readFullyAsString(stream);
+            InstallProfile installProfile = Constants.GSON.fromJson(json, InstallProfile.class);
+            if (installProfile == null)
+                throw new IOException("Malformed forge installer file, install_profile.json does not exist.");
+            
+            // unpack the universal jar in the installer file.
+            Library forgeLibrary = Library.fromName(installProfile.getInstall().getPath());
+            File forgeFile = dependencyManager.getGameRepository().getLibraryFile(version, forgeLibrary);
+            if (!FileUtils.makeFile(forgeFile))
+                throw new IOException("Cannot make directory " + forgeFile.getParent());
+            
+            ZipEntry forgeEntry = zipFile.getEntry(installProfile.getInstall().getFilePath());
+            try (InputStream is = zipFile.getInputStream(forgeEntry); OutputStream os = new FileOutputStream(forgeFile)) {
+                IOUtils.copyTo(is, os);
+            }
+            
+            // resolve the version
+            SimpleVersionProvider provider = new SimpleVersionProvider();
+            provider.addVersion(version);
+            
+            setResult(installProfile.getVersionInfo()
+                    .setInheritsFrom(version.getId())
+                    .resolve(provider)
+                    .setId(version.getId()).setLogging(Collections.EMPTY_MAP));
+            
+            dependencies.add(new GameLibrariesTask(dependencyManager, installProfile.getVersionInfo()));
+        }
+        
+        if (!installer.delete())
+            throw new IOException("Unable to delete installer file" + installer);
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/forge/ForgeVersion.java

@@ -0,0 +1,91 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.forge;
+
+import com.google.gson.JsonParseException;
+import org.jackhuang.hmcl.util.Immutable;
+import org.jackhuang.hmcl.util.Validation;
+
+/**
+ *
+ * @author huangyuhui
+ */
+@Immutable
+public final class ForgeVersion implements Validation {
+
+    private final String branch;
+    private final String mcversion;
+    private final String jobver;
+    private final String version;
+    private final int build;
+    private final double modified;
+    private final String[][] files;
+
+    public ForgeVersion() {
+        this(null, null, null, null, 0, 0, null);
+    }
+
+    public ForgeVersion(String branch, String mcversion, String jobver, String version, int build, double modified, String[][] files) {
+        this.branch = branch;
+        this.mcversion = mcversion;
+        this.jobver = jobver;
+        this.version = version;
+        this.build = build;
+        this.modified = modified;
+        this.files = files;
+    }
+
+    public String getBranch() {
+        return branch;
+    }
+
+    public String getGameVersion() {
+        return mcversion;
+    }
+
+    public String getJobver() {
+        return jobver;
+    }
+
+    public String getVersion() {
+        return version;
+    }
+
+    public int getBuild() {
+        return build;
+    }
+
+    public double getModified() {
+        return modified;
+    }
+
+    public String[][] getFiles() {
+        return files;
+    }
+
+    @Override
+    public void validate() throws JsonParseException {
+        if (files == null)
+            throw new JsonParseException("ForgeVersion files cannot be null");
+        if (version == null)
+            throw new JsonParseException("ForgeVersion version cannot be null");
+        if (mcversion == null)
+            throw new JsonParseException("ForgeVersion mcversion cannot be null");
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/forge/ForgeVersionList.java

@@ -0,0 +1,93 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.forge;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import org.jackhuang.hmcl.download.DownloadProvider;
+import org.jackhuang.hmcl.download.RemoteVersion;
+import org.jackhuang.hmcl.download.VersionList;
+import org.jackhuang.hmcl.task.GetTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.Constants;
+import org.jackhuang.hmcl.util.NetworkUtils;
+import org.jackhuang.hmcl.util.StringUtils;
+import org.jackhuang.hmcl.util.VersionNumber;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class ForgeVersionList extends VersionList<Void> {
+
+    public static final ForgeVersionList INSTANCE = new ForgeVersionList();
+
+    private ForgeVersionList() {
+    }
+
+    @Override
+    public Task refreshAsync(DownloadProvider downloadProvider) {
+        final GetTask task = new GetTask(NetworkUtils.toURL(downloadProvider.injectURL(FORGE_LIST)));
+        final List<Task> dependents = Collections.singletonList(task);
+        return new Task() {
+
+            @Override
+            public Collection<Task> getDependents() {
+                return dependents;
+            }
+
+            @Override
+            public void execute() throws Exception {
+                ForgeVersionRoot root = Constants.GSON.fromJson(task.getResult(), ForgeVersionRoot.class);
+                if (root == null)
+                    return;
+                versions.clear();
+
+                for (Map.Entry<String, int[]> entry : root.getGameVersions().entrySet()) {
+                    String gameVersion = VersionNumber.parseVersion(entry.getKey());
+                    if (gameVersion == null)
+                        continue;
+                    for (int v : entry.getValue()) {
+                        ForgeVersion version = root.getNumber().get(v);
+                        if (version == null)
+                            continue;
+                        String jar = null;
+                        for (String[] file : version.getFiles())
+                            if (file.length > 1 && "installer".equals(file[1])) {
+                                String classifier = version.getGameVersion() + "-" + version.getVersion()
+                                        + (StringUtils.isNotBlank(version.getBranch()) ? "-" + version.getBranch() : "");
+                                String fileName = root.getArtifact() + "-" + classifier + "-" + file[1] + "." + file[0];
+                                jar = downloadProvider.injectURL(root.getWebPath() + classifier + "/" + fileName);
+                            }
+
+                        if (jar == null)
+                            continue;
+                        versions.put(gameVersion, new RemoteVersion<>(
+                                version.getGameVersion(), version.getVersion(), jar, null
+                        ));
+                    }
+                }
+            }
+
+        };
+    }
+
+    public static final String FORGE_LIST = "http://files.minecraftforge.net/maven/net/minecraftforge/forge/json";
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/forge/ForgeVersionRoot.java

@@ -0,0 +1,102 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.forge;
+
+import com.google.gson.JsonParseException;
+import java.util.Map;
+import org.jackhuang.hmcl.util.Immutable;
+import org.jackhuang.hmcl.util.Validation;
+
+/**
+ *
+ * @author huangyuhui
+ */
+@Immutable
+public final class ForgeVersionRoot implements Validation {
+
+    private final String artifact;
+    private final String webpath;
+    private final String adfly;
+    private final String homepage;
+    private final String name;
+    private final Map<String, int[]> branches;
+    private final Map<String, int[]> mcversion;
+    private final Map<String, Integer> promos;
+    private final Map<Integer, ForgeVersion> number;
+
+    public ForgeVersionRoot() {
+        this(null, null, null, null, null, null, null, null, null);
+    }
+
+    public ForgeVersionRoot(String artifact, String webpath, String adfly, String homepage, String name, Map<String, int[]> branches, Map<String, int[]> mcversion, Map<String, Integer> promos, Map<Integer, ForgeVersion> number) {
+        this.artifact = artifact;
+        this.webpath = webpath;
+        this.adfly = adfly;
+        this.homepage = homepage;
+        this.name = name;
+        this.branches = branches;
+        this.mcversion = mcversion;
+        this.promos = promos;
+        this.number = number;
+    }
+
+    public String getArtifact() {
+        return artifact;
+    }
+
+    public String getWebPath() {
+        return webpath;
+    }
+
+    public String getAdfly() {
+        return adfly;
+    }
+
+    public String getHomePage() {
+        return homepage;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Map<String, int[]> getBranches() {
+        return branches;
+    }
+
+    public Map<String, int[]> getGameVersions() {
+        return mcversion;
+    }
+
+    public Map<String, Integer> getPromos() {
+        return promos;
+    }
+
+    public Map<Integer, ForgeVersion> getNumber() {
+        return number;
+    }
+
+    @Override
+    public void validate() throws JsonParseException {
+        if (number == null)
+            throw new JsonParseException("ForgeVersionRoot number cannot be null");
+        if (mcversion == null)
+            throw new JsonParseException("ForgeVersionRoot mcversion cannot be null");
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/forge/Install.java

@@ -0,0 +1,91 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.forge;
+
+import org.jackhuang.hmcl.util.Immutable;
+
+/**
+ *
+ * @author huangyuhui
+ */
+@Immutable
+public final class Install {
+
+    private final String profileName;
+    private final String target;
+    private final String path;
+    private final String version;
+    private final String filePath;
+    private final String welcome;
+    private final String minecraft;
+    private final String mirrorList;
+    private final String logo;
+
+    public Install() {
+        this(null, null, null, null, null, null, null, null, null);
+    }
+
+    public Install(String profileName, String target, String path, String version, String filePath, String welcome, String minecraft, String mirrorList, String logo) {
+        this.profileName = profileName;
+        this.target = target;
+        this.path = path;
+        this.version = version;
+        this.filePath = filePath;
+        this.welcome = welcome;
+        this.minecraft = minecraft;
+        this.mirrorList = mirrorList;
+        this.logo = logo;
+    }
+
+    public String getProfileName() {
+        return profileName;
+    }
+
+    public String getTarget() {
+        return target;
+    }
+
+    public String getPath() {
+        return path;
+    }
+
+    public String getVersion() {
+        return version;
+    }
+
+    public String getFilePath() {
+        return filePath;
+    }
+
+    public String getWelcome() {
+        return welcome;
+    }
+
+    public String getMinecraft() {
+        return minecraft;
+    }
+
+    public String getMirrorList() {
+        return mirrorList;
+    }
+
+    public String getLogo() {
+        return logo;
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/forge/InstallProfile.java

@@ -0,0 +1,60 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.forge;
+
+import com.google.gson.JsonParseException;
+import com.google.gson.annotations.SerializedName;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.util.Immutable;
+import org.jackhuang.hmcl.util.Validation;
+
+/**
+ *
+ * @author huangyuhui
+ */
+@Immutable
+public final class InstallProfile implements Validation {
+
+    @SerializedName("install")
+    private final Install install;
+
+    @SerializedName("versionInfo")
+    private final Version versionInfo;
+
+    public InstallProfile(Install install, Version versionInfo) {
+        this.install = install;
+        this.versionInfo = versionInfo;
+    }
+
+    public Install getInstall() {
+        return install;
+    }
+
+    public Version getVersionInfo() {
+        return versionInfo;
+    }
+
+    @Override
+    public void validate() throws JsonParseException {
+        if (install == null)
+            throw new JsonParseException("InstallProfile install cannot be null");
+
+        if (versionInfo == null)
+            throw new JsonParseException("InstallProfile versionInfo cannot be null");
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameAssetDownloadTask.java

@@ -0,0 +1,111 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.game;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.logging.Level;
+import org.jackhuang.hmcl.download.AbstractDependencyManager;
+import org.jackhuang.hmcl.game.AssetIndexInfo;
+import org.jackhuang.hmcl.game.AssetObject;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.task.FileDownloadTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.DigestUtils;
+import org.jackhuang.hmcl.util.FileUtils;
+import org.jackhuang.hmcl.util.Logging;
+import org.jackhuang.hmcl.util.NetworkUtils;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class GameAssetDownloadTask extends Task {
+    
+    private final AbstractDependencyManager dependencyManager;
+    private final Version version;
+    private final GameAssetRefreshTask refreshTask;
+    private final List<Task> dependents = new LinkedList<>();
+    private final List<Task> dependencies = new LinkedList<>();
+
+    /**
+     * Constructor.
+     *
+     * @param dependencyManager the dependency manager that can provides proxy settings and {@link org.jackhuang.hmcl.game.GameRepository}
+     * @param version the <b>resolved</b> version
+     */
+    public GameAssetDownloadTask(AbstractDependencyManager dependencyManager, Version version) {
+        this.dependencyManager = dependencyManager;
+        this.version = version;
+        this.refreshTask = new GameAssetRefreshTask(dependencyManager, version);
+        this.dependents.add(refreshTask);
+    }
+
+    @Override
+    public Collection<Task> getDependents() {
+        return dependents;
+    }
+
+    @Override
+    public List<Task> getDependencies() {
+        return dependencies;
+    }
+    
+    @Override
+    public void execute() throws Exception {
+        int size = refreshTask.getResult().size();
+        for (Map.Entry<File, AssetObject> entry : refreshTask.getResult()) {
+            File file = entry.getKey();
+            AssetObject assetObject = entry.getValue();
+            String url = dependencyManager.getDownloadProvider().getAssetBaseURL() + assetObject.getLocation();
+            if (!FileUtils.makeDirectory(file.getAbsoluteFile().getParentFile())) {
+                Logging.LOG.log(Level.SEVERE, "Unable to create new file {0}, because parent directory cannot be created", file);
+                continue;
+            }
+            if (file.isDirectory())
+                continue;
+            boolean flag = true;
+            int downloaded = 0;
+            try {
+                // check the checksum of file to ensure that the file is not need to re-download.
+                if (file.exists()) {
+                    String sha1 = DigestUtils.sha1Hex(FileUtils.readBytes(file));
+                    if (sha1.equals(assetObject.getHash())) {
+                        ++downloaded;
+                        Logging.LOG.finest("File $file has been downloaded successfully, skipped downloading");
+                        updateProgress(downloaded, size);
+                        continue;
+                    }
+                }
+            } catch (IOException e) {
+                Logging.LOG.log(Level.WARNING, "Unable to get hash code of file " + file, e);
+                flag = !file.exists();
+            }
+            if (flag) {
+                FileDownloadTask task = new FileDownloadTask(NetworkUtils.toURL(url), file, dependencyManager.getProxy(), assetObject.getHash());
+                task.setName(assetObject.getHash());
+                dependencies.add(task);
+            }
+        }
+    }
+    
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameAssetIndexDownloadTask.java

@@ -0,0 +1,72 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.game;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.LinkedList;
+import java.util.List;
+import org.jackhuang.hmcl.download.AbstractDependencyManager;
+import org.jackhuang.hmcl.game.AssetIndexInfo;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.task.FileDownloadTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.FileUtils;
+import org.jackhuang.hmcl.util.NetworkUtils;
+
+/**
+ * This task is to download asset index file provided in minecraft.json.
+ *
+ * @author huangyuhui
+ */
+public final class GameAssetIndexDownloadTask extends Task {
+
+    private final AbstractDependencyManager dependencyManager;
+    private final Version version;
+    private final List<Task> dependencies = new LinkedList<>();
+
+    /**
+     * Constructor.
+     *
+     * @param dependencyManager the dependency manager that can provides proxy settings and {@link org.jackhuang.hmcl.game.GameRepository}
+     * @param version the <b>resolved</b> version
+     */
+    public GameAssetIndexDownloadTask(AbstractDependencyManager dependencyManager, Version version) {
+        this.dependencyManager = dependencyManager;
+        this.version = version;
+    }
+
+    @Override
+    public List<Task> getDependencies() {
+        return dependencies;
+    }
+
+    @Override
+    public void execute() throws Exception {
+        AssetIndexInfo assetIndexInfo = version.getAssetIndex();
+        File assetDir = dependencyManager.getGameRepository().getAssetDirectory(version.getId(), assetIndexInfo.getId());
+        if (FileUtils.makeDirectory(assetDir))
+            throw new IOException("Cannot create directory: " + assetDir);
+        File assetIndexFile = dependencyManager.getGameRepository().getIndexFile(version.getId(), assetIndexInfo.getId());
+        dependencies.add(new FileDownloadTask(
+                NetworkUtils.toURL(dependencyManager.getDownloadProvider().injectURL(assetIndexInfo.getUrl())),
+                assetIndexFile, dependencyManager.getProxy()
+        ));
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameAssetRefreshTask.java

@@ -0,0 +1,88 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.game;
+
+import java.io.File;
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.List;
+import org.jackhuang.hmcl.download.AbstractDependencyManager;
+import org.jackhuang.hmcl.game.AssetIndex;
+import org.jackhuang.hmcl.game.AssetIndexInfo;
+import org.jackhuang.hmcl.game.AssetObject;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.task.TaskResult;
+import org.jackhuang.hmcl.util.Constants;
+import org.jackhuang.hmcl.util.FileUtils;
+import org.jackhuang.hmcl.util.Pair;
+
+/**
+ * This task is to extract all asset objects described in asset index json.
+ *
+ * @author huangyuhui
+ */
+public final class GameAssetRefreshTask extends TaskResult<Collection<Pair<File, AssetObject>>> {
+
+    private final AbstractDependencyManager dependencyManager;
+    private final Version version;
+    private final AssetIndexInfo assetIndexInfo;
+    private final File assetIndexFile;
+    private final List<Task> dependents = new LinkedList<>();
+
+    /**
+     * Constructor.
+     *
+     * @param dependencyManager the dependency manager that can provides proxy settings and {@link org.jackhuang.hmcl.game.GameRepository}
+     * @param version the <b>resolved</b> version
+     */
+    public GameAssetRefreshTask(AbstractDependencyManager dependencyManager, Version version) {
+        this.dependencyManager = dependencyManager;
+        this.version = version;
+        this.assetIndexInfo = version.getAssetIndex();
+        this.assetIndexFile = dependencyManager.getGameRepository().getIndexFile(version.getId(), assetIndexInfo.getId());
+
+        if (!assetIndexFile.exists())
+            dependents.add(new GameAssetIndexDownloadTask(dependencyManager, version));
+    }
+
+    @Override
+    public List<Task> getDependents() {
+        return dependents;
+    }
+
+    @Override
+    public String getId() {
+        return ID;
+    }
+
+    @Override
+    public void execute() throws Exception {
+        AssetIndex index = Constants.GSON.fromJson(FileUtils.readText(assetIndexFile), AssetIndex.class);
+        List<Pair<File, AssetObject>> res = new LinkedList<>();
+        int progress = 0;
+        if (index != null)
+            for (AssetObject assetObject : index.getObjects().values()) {
+                res.add(new Pair<>(dependencyManager.getGameRepository().getAssetObject(version.getId(), assetIndexInfo.getId(), assetObject), assetObject));
+                updateProgress(++progress, index.getObjects().size());
+            }
+        setResult(res);
+    }
+
+    public static final String ID = "game_asset_refresh_task";
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameDownloadTask.java

@@ -0,0 +1,60 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.game;
+
+import java.io.File;
+import java.util.LinkedList;
+import java.util.List;
+import org.jackhuang.hmcl.download.DefaultDependencyManager;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.task.FileDownloadTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.NetworkUtils;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class GameDownloadTask extends Task {
+    private final DefaultDependencyManager dependencyManager;
+    private final Version version;
+    private final List<Task> dependencies = new LinkedList<>();
+
+    public GameDownloadTask(DefaultDependencyManager dependencyManager, Version version) {
+        this.dependencyManager = dependencyManager;
+        this.version = version;
+    }
+
+    @Override
+    public List<Task> getDependencies() {
+        return dependencies;
+    }
+
+    @Override
+    public void execute() throws Exception {
+        File jar = dependencyManager.getGameRepository().getVersionJar(version);
+        
+        dependencies.add(new FileDownloadTask(
+                NetworkUtils.toURL(dependencyManager.getDownloadProvider().injectURL(version.getDownloadInfo().getUrl())),
+                jar,
+                dependencyManager.getProxy(),
+                version.getDownloadInfo().getSha1()
+        ));
+    }
+    
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameLibrariesTask.java

@@ -0,0 +1,70 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.game;
+
+import java.io.File;
+import java.util.LinkedList;
+import java.util.List;
+import org.jackhuang.hmcl.download.AbstractDependencyManager;
+import org.jackhuang.hmcl.game.Library;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.task.FileDownloadTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.NetworkUtils;
+
+/**
+ * This task is to download game libraries.
+ * This task should be executed last(especially after game downloading, Forge, LiteLoader and OptiFine install task).
+ *
+ * @author huangyuhui
+ */
+public final class GameLibrariesTask extends Task {
+
+    private final AbstractDependencyManager dependencyManager;
+    private final Version version;
+    private final List<Task> dependencies = new LinkedList<>();
+
+    /**
+     * Constructor.
+     *
+     * @param dependencyManager the dependency manager that can provides proxy settings and {@link org.jackhuang.hmcl.game.GameRepository}
+     * @param version the <b>resolved</b> version
+     */
+    public GameLibrariesTask(AbstractDependencyManager dependencyManager, Version version) {
+        this.dependencyManager = dependencyManager;
+        this.version = version;
+    }
+
+    @Override
+    public List<Task> getDependencies() {
+        return dependencies;
+    }
+
+    @Override
+    public void execute() throws Exception {
+        for (Library library : version.getLibraries())
+            if (library.appliesToCurrentEnvironment()) {
+                File file = dependencyManager.getGameRepository().getLibraryFile(version, library);
+                if (!file.exists())
+                    dependencies.add(new FileDownloadTask(
+                            NetworkUtils.toURL(dependencyManager.getDownloadProvider().injectURL(library.getDownload().getUrl())),
+                            file, dependencyManager.getProxy(), library.getDownload().getSha1()));
+            }
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameLoggingDownloadTask.java

@@ -0,0 +1,70 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.game;
+
+import java.io.File;
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.List;
+import org.jackhuang.hmcl.download.DependencyManager;
+import org.jackhuang.hmcl.game.DownloadType;
+import org.jackhuang.hmcl.game.LoggingInfo;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.task.FileDownloadTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.NetworkUtils;
+
+/**
+ * This task is to download log4j configuration file provided in minecraft.json.
+ *
+ * @author huangyuhui
+ */
+public final class GameLoggingDownloadTask extends Task {
+
+    private final DependencyManager dependencyManager;
+    private final Version version;
+    private final List<Task> dependencies = new LinkedList<>();
+
+    /**
+     * Constructor.
+     *
+     * @param dependencyManager the dependency manager that can provides proxy settings and {@link org.jackhuang.hmcl.game.GameRepository}
+     * @param version the <b>resolved</b> version
+     */
+    public GameLoggingDownloadTask(DependencyManager dependencyManager, Version version) {
+        this.dependencyManager = dependencyManager;
+        this.version = version;
+    }
+
+    @Override
+    public Collection<Task> getDependencies() {
+        return dependencies;
+    }
+
+    @Override
+    public void execute() throws Exception {
+        if (version.getLogging() == null || !version.getLogging().containsKey(DownloadType.CLIENT))
+            return;
+
+        LoggingInfo logging = version.getLogging().get(DownloadType.CLIENT);
+        File file = dependencyManager.getGameRepository().getLoggingObject(version.getId(), version.getAssetIndex().getId(), logging);
+        if (!file.exists())
+            dependencies.add(new FileDownloadTask(NetworkUtils.toURL(logging.getFile().getUrl()), file, dependencyManager.getProxy()));
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameRemoteLatestVersions.java

@@ -0,0 +1,52 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.game;
+
+import com.google.gson.annotations.SerializedName;
+import org.jackhuang.hmcl.util.Immutable;
+
+/**
+ *
+ * @author huangyuhui
+ */
+@Immutable
+public final class GameRemoteLatestVersions {
+
+    @SerializedName("snapshot")
+    private final String snapshot;
+
+    @SerializedName("release")
+    private final String release;
+
+    public GameRemoteLatestVersions() {
+        this(null, null);
+    }
+
+    public GameRemoteLatestVersions(String snapshot, String release) {
+        this.snapshot = snapshot;
+        this.release = release;
+    }
+
+    public String getRelease() {
+        return release;
+    }
+
+    public String getSnapshot() {
+        return snapshot;
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameRemoteVersion.java

@@ -0,0 +1,92 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.game;
+
+import com.google.gson.JsonParseException;
+import com.google.gson.annotations.SerializedName;
+import java.util.Date;
+import org.jackhuang.hmcl.game.ReleaseType;
+import org.jackhuang.hmcl.util.Constants;
+import org.jackhuang.hmcl.util.StringUtils;
+import org.jackhuang.hmcl.util.Validation;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class GameRemoteVersion implements Validation {
+
+    @SerializedName("id")
+    private final String gameVersion;
+
+    @SerializedName("time")
+    private final Date time;
+
+    @SerializedName("releaseTime")
+    private final Date releaseTime;
+
+    @SerializedName("type")
+    private final ReleaseType type;
+
+    @SerializedName("url")
+    private final String url;
+
+    public GameRemoteVersion() {
+        this("", new Date(), new Date(), ReleaseType.UNKNOWN);
+    }
+
+    public GameRemoteVersion(String gameVersion, Date time, Date releaseTime, ReleaseType type) {
+        this(gameVersion, time, releaseTime, type, Constants.DEFAULT_LIBRARY_URL + gameVersion + "/" + gameVersion + ".json");
+    }
+
+    public GameRemoteVersion(String gameVersion, Date time, Date releaseTime, ReleaseType type, String url) {
+        this.gameVersion = gameVersion;
+        this.time = time;
+        this.releaseTime = releaseTime;
+        this.type = type;
+        this.url = url;
+    }
+
+    public String getGameVersion() {
+        return gameVersion;
+    }
+
+    public Date getTime() {
+        return time;
+    }
+
+    public Date getReleaseTime() {
+        return releaseTime;
+    }
+
+    public ReleaseType getType() {
+        return type;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+    
+    @Override
+    public void validate() throws JsonParseException {
+        if (StringUtils.isBlank(gameVersion))
+            throw new JsonParseException("GameRemoteVersion id cannot be blank");
+        if (StringUtils.isBlank(url))
+            throw new JsonParseException("GameRemoteVersion url cannot be blank");
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameRemoteVersionTag.java

@@ -15,27 +15,36 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hmcl.game
+package org.jackhuang.hmcl.download.game;
 
-import com.google.gson.annotations.SerializedName
+import java.util.Date;
-import org.jackhuang.hmcl.util.Immutable
+import org.jackhuang.hmcl.game.ReleaseType;
-import org.jackhuang.hmcl.util.Validation
+import org.jackhuang.hmcl.util.Immutable;
 
+/**
+ *
+ * @author huangyuhui
+ */
 @Immutable
-class LoggingInfo @JvmOverloads constructor(
+public final class GameRemoteVersionTag {
-        @SerializedName("file")
-        val file: IdDownloadInfo = IdDownloadInfo(),
 
-        @SerializedName("argument")
+    private final ReleaseType type;
-        val argument: String = "",
+    private final Date time;
 
-        @SerializedName("type")
+    public GameRemoteVersionTag() {
-        val type: String = ""
+        this(ReleaseType.UNKNOWN, new Date());
-): Validation {
-
-    override fun validate() {
-        file.validate()
-        require(argument.isNotBlank(), { "LoggingInfo" })
-        require(type.isNotBlank())
     }
-}
+
+    public GameRemoteVersionTag(ReleaseType type, Date time) {
+        this.type = type;
+        this.time = time;
+    }
+
+    public Date getTime() {
+        return time;
+    }
+
+    public ReleaseType getType() {
+        return type;
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameRemoteVersions.java

@@ -0,0 +1,55 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.game;
+
+import com.google.gson.annotations.SerializedName;
+import java.util.Collections;
+import java.util.List;
+import org.jackhuang.hmcl.util.Immutable;
+
+/**
+ *
+ * @author huangyuhui
+ */
+@Immutable
+public final class GameRemoteVersions {
+
+    @SerializedName("versions")
+    private final List<GameRemoteVersion> versions;
+
+    @SerializedName("latest")
+    private final GameRemoteLatestVersions latest;
+
+    public GameRemoteVersions() {
+        this(Collections.EMPTY_LIST, null);
+    }
+
+    public GameRemoteVersions(List<GameRemoteVersion> versions, GameRemoteLatestVersions latest) {
+        this.versions = versions;
+        this.latest = latest;
+    }
+
+    public GameRemoteLatestVersions getLatest() {
+        return latest;
+    }
+
+    public List<GameRemoteVersion> getVersions() {
+        return versions;
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameVersionList.java

@@ -0,0 +1,71 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.game;
+
+import java.util.Collection;
+import java.util.Collections;
+import org.jackhuang.hmcl.download.DownloadProvider;
+import org.jackhuang.hmcl.download.RemoteVersion;
+import org.jackhuang.hmcl.download.VersionList;
+import org.jackhuang.hmcl.task.GetTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.Constants;
+import org.jackhuang.hmcl.util.NetworkUtils;
+import org.jackhuang.hmcl.util.VersionNumber;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class GameVersionList extends VersionList<GameRemoteVersionTag> {
+
+    public static final GameVersionList INSTANCE = new GameVersionList();
+
+    private GameVersionList() {
+    }
+
+    @Override
+    public Task refreshAsync(DownloadProvider downloadProvider) {
+        GetTask task = new GetTask(NetworkUtils.toURL(downloadProvider.getVersionListURL()));
+        return new Task() {
+            @Override
+            public Collection<Task> getDependents() {
+                return Collections.singleton(task);
+            }
+
+            @Override
+            public void execute() throws Exception {
+                versions.clear();
+
+                GameRemoteVersions root = Constants.GSON.fromJson(task.getResult(), GameRemoteVersions.class);
+                for (GameRemoteVersion remoteVersion : root.getVersions()) {
+                    String gameVersion = VersionNumber.parseVersion(remoteVersion.getGameVersion());
+                    if (gameVersion == null)
+                        continue;
+                    versions.put(gameVersion, new RemoteVersion<>(
+                            remoteVersion.getGameVersion(),
+                            remoteVersion.getGameVersion(),
+                            remoteVersion.getUrl(),
+                            new GameRemoteVersionTag(remoteVersion.getType(), remoteVersion.getReleaseTime()))
+                    );
+                }
+            }
+        };
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/VersionJsonDownloadTask.java

@@ -0,0 +1,70 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.game;
+
+import java.net.Proxy;
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.List;
+import org.jackhuang.hmcl.download.DefaultDependencyManager;
+import org.jackhuang.hmcl.download.RemoteVersion;
+import org.jackhuang.hmcl.download.VersionList;
+import org.jackhuang.hmcl.task.GetTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.NetworkUtils;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class VersionJsonDownloadTask extends Task {
+    private final String gameVersion;
+    private final DefaultDependencyManager dependencyManager;
+    private final List<Task> dependents = new LinkedList<>();
+    private final List<Task> dependencies = new LinkedList<>();
+    private final VersionList<?> gameVersionList;
+
+    public VersionJsonDownloadTask(String gameVersion, DefaultDependencyManager dependencyManager) {
+        this.gameVersion = gameVersion;
+        this.dependencyManager = dependencyManager;
+        this.gameVersionList = dependencyManager.getVersionList("game");
+        
+        if (!gameVersionList.isLoaded())
+            dependents.add(gameVersionList.refreshAsync(dependencyManager.getDownloadProvider()));
+    }
+
+    @Override
+    public Collection<Task> getDependencies() {
+        return dependencies;
+    }
+
+    @Override
+    public Collection<Task> getDependents() {
+        return dependents;
+    }
+
+    @Override
+    public void execute() throws Exception {
+        RemoteVersion<?> remoteVersion = gameVersionList.getVersions(gameVersion).stream().findFirst()
+                .orElseThrow(() -> new IllegalStateException("Cannot find specific version "+gameVersion+" in remote repository"));
+        String jsonURL = dependencyManager.getDownloadProvider().injectURL(remoteVersion.getUrl());
+        dependencies.add(new GetTask(NetworkUtils.toURL(jsonURL), Proxy.NO_PROXY, ID));
+    }
+    
+    public static final String ID = "raw_version_json";
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/VersionJsonSaveTask.java

@@ -0,0 +1,56 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.game;
+
+import java.io.File;
+import java.io.IOException;
+import org.jackhuang.hmcl.game.DefaultGameRepository;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.Constants;
+import org.jackhuang.hmcl.util.FileUtils;
+
+/**
+ * This task is to save the version json.
+ *
+ * @author huangyuhui
+ */
+public final class VersionJsonSaveTask extends Task {
+
+    private final DefaultGameRepository repository;
+    private final Version version;
+
+    /**
+     * Constructor.
+     *
+     * @param repository the game repository
+     * @param version the **resolved** version
+     */
+    public VersionJsonSaveTask(DefaultGameRepository repository, Version version) {
+        this.repository = repository;
+        this.version = version;
+    }
+
+    @Override
+    public void execute() throws Exception {
+        File json = repository.getVersionJson(version.getId()).getAbsoluteFile();
+        if (!FileUtils.makeFile(json))
+            throw new IOException("Cannot create file " + json);
+        FileUtils.writeText(json, Constants.GSON.toJson(version));
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/liteloader/LiteLoaderBranch.java

@@ -0,0 +1,57 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.liteloader;
+
+import com.google.gson.annotations.SerializedName;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
+import org.jackhuang.hmcl.game.Library;
+import org.jackhuang.hmcl.util.Immutable;
+
+/**
+ *
+ * @author huangyuhui
+ */
+@Immutable
+public final class LiteLoaderBranch {
+
+    @SerializedName("libraries")
+    private final Collection<Library> libraries;
+
+    @SerializedName("com.mumfrey:liteloader")
+    private final Map<String, LiteLoaderVersion> liteLoader;
+
+    public LiteLoaderBranch() {
+        this(Collections.EMPTY_SET, Collections.EMPTY_MAP);
+    }
+
+    public LiteLoaderBranch(Collection<Library> libraries, Map<String, LiteLoaderVersion> liteLoader) {
+        this.libraries = libraries;
+        this.liteLoader = liteLoader;
+    }
+
+    public Collection<Library> getLibraries() {
+        return Collections.unmodifiableCollection(libraries);
+    }
+
+    public Map<String, LiteLoaderVersion> getLiteLoader() {
+        return Collections.unmodifiableMap(liteLoader);
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/liteloader/LiteLoaderGameVersions.java

@@ -0,0 +1,61 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.liteloader;
+
+import com.google.gson.annotations.SerializedName;
+import org.jackhuang.hmcl.util.Immutable;
+
+/**
+ *
+ * @author huangyuhui
+ */
+@Immutable
+public final class LiteLoaderGameVersions {
+
+    @SerializedName("repo")
+    private final LiteLoaderRepository repoitory;
+
+    @SerializedName("artefacts")
+    private final LiteLoaderBranch artifacts;
+
+    @SerializedName("snapshots")
+    private final LiteLoaderBranch snapshots;
+
+    public LiteLoaderGameVersions() {
+        this(null, null, null);
+    }
+
+    public LiteLoaderGameVersions(LiteLoaderRepository repoitory, LiteLoaderBranch artifacts, LiteLoaderBranch snapshots) {
+        this.repoitory = repoitory;
+        this.artifacts = artifacts;
+        this.snapshots = snapshots;
+    }
+
+    public LiteLoaderRepository getRepoitory() {
+        return repoitory;
+    }
+
+    public LiteLoaderBranch getArtifacts() {
+        return artifacts;
+    }
+
+    public LiteLoaderBranch getSnapshots() {
+        return snapshots;
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/liteloader/LiteLoaderInstallTask.java

@@ -0,0 +1,111 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.liteloader;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+import org.jackhuang.hmcl.download.DefaultDependencyManager;
+import org.jackhuang.hmcl.download.RemoteVersion;
+import org.jackhuang.hmcl.download.game.GameLibrariesTask;
+import org.jackhuang.hmcl.game.Arguments;
+import org.jackhuang.hmcl.game.LibrariesDownloadInfo;
+import org.jackhuang.hmcl.game.Library;
+import org.jackhuang.hmcl.game.LibraryDownloadInfo;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.task.TaskResult;
+import org.jackhuang.hmcl.util.Lang;
+
+/**
+ * Note: LiteLoader must be installed after Forge.
+ *
+ * @author huangyuhui
+ */
+public final class LiteLoaderInstallTask extends TaskResult<Version> {
+
+    private final DefaultDependencyManager dependencyManager;
+    private final String gameVersion;
+    private final Version version;
+    private final String remoteVersion;
+    private final LiteLoaderVersionList liteLoaderVersionList;
+    private RemoteVersion<LiteLoaderRemoteVersionTag> remote;
+    private final List<Task> dependents = new LinkedList<>();
+    private final List<Task> dependencies = new LinkedList<>();
+
+    private void doRemote() {
+        remote = liteLoaderVersionList.getVersion(gameVersion, remoteVersion)
+                .orElseThrow(() -> new IllegalArgumentException("Remote LiteLoader version " + gameVersion + ", " + remoteVersion + " not found"));
+    }
+
+    public LiteLoaderInstallTask(DefaultDependencyManager dependencyManager, String gameVersion, Version version, String remoteVersion) {
+        this.dependencyManager = dependencyManager;
+        this.gameVersion = gameVersion;
+        this.version = version;
+        this.remoteVersion = remoteVersion;
+
+        liteLoaderVersionList = (LiteLoaderVersionList) dependencyManager.getVersionList("liteloader");
+
+        if (!liteLoaderVersionList.isLoaded())
+            dependents.add(liteLoaderVersionList.refreshAsync(dependencyManager.getDownloadProvider())
+                    .then(s -> {
+                        doRemote();
+                        return null;
+                    }));
+        else
+            doRemote();
+    }
+
+    @Override
+    public Collection<Task> getDependents() {
+        return dependents;
+    }
+
+    @Override
+    public Collection<Task> getDependencies() {
+        return dependencies;
+    }
+
+    @Override
+    public String getId() {
+        return "version";
+    }
+
+    @Override
+    public void execute() throws Exception {
+        Library library = new Library(
+                "com.mumfrey", "liteloader", remote.getSelfVersion(), null,
+                "http://dl.liteloader.com/versions/",
+                new LibrariesDownloadInfo(new LibraryDownloadInfo(null, remote.getUrl()))
+        );
+
+        Version tempVersion = version.setLibraries(Lang.merge(remote.getTag().getLibraries(), Arrays.asList(library)));
+        setResult(version
+                .setMainClass("net.minecraft.launchwrapper.Launch")
+                .setLibraries(Lang.merge(tempVersion.getLibraries(), version.getLibraries()))
+                .setLogging(Collections.EMPTY_MAP)
+                .setMinecraftArguments(version.getMinecraftArguments().orElse("") + " --tweakClass " + remote.getTag().getTweakClass())
+                //.setArguments(Arguments.addGameArguments(Lang.get(version.getArguments()), "--tweakClass", remote.getTag().getTweakClass()))
+        );
+
+        dependencies.add(new GameLibrariesTask(dependencyManager, tempVersion));
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/liteloader/LiteLoaderRemoteVersionTag.java

@@ -0,0 +1,49 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.liteloader;
+
+import java.util.Collection;
+import java.util.Collections;
+import org.jackhuang.hmcl.game.Library;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class LiteLoaderRemoteVersionTag {
+    private final String tweakClass;
+    private final Collection<Library> libraries;
+
+    public LiteLoaderRemoteVersionTag() {
+        this("", Collections.EMPTY_SET);
+    }
+
+    public LiteLoaderRemoteVersionTag(String tweakClass, Collection<Library> libraries) {
+        this.tweakClass = tweakClass;
+        this.libraries = libraries;
+    }
+
+    public Collection<Library> getLibraries() {
+        return libraries;
+    }
+
+    public String getTweakClass() {
+        return tweakClass;
+    }
+    
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/liteloader/LiteLoaderRepository.java

@@ -0,0 +1,69 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.liteloader;
+
+import com.google.gson.annotations.SerializedName;
+import org.jackhuang.hmcl.util.Immutable;
+
+/**
+ *
+ * @author huangyuhui
+ */
+@Immutable
+public final class LiteLoaderRepository {
+
+    @SerializedName("stream")
+    private final String stream;
+
+    @SerializedName("type")
+    private final String type;
+
+    @SerializedName("url")
+    private final String url;
+
+    @SerializedName("classifier")
+    private final String classifier;
+
+    public LiteLoaderRepository() {
+        this("", "", "", "");
+    }
+
+    public LiteLoaderRepository(String stream, String type, String url, String classifier) {
+        this.stream = stream;
+        this.type = type;
+        this.url = url;
+        this.classifier = classifier;
+    }
+
+    public String getStream() {
+        return stream;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public String getClassifier() {
+        return classifier;
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/liteloader/LiteLoaderVersion.java

@@ -0,0 +1,81 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.liteloader;
+
+import java.util.Collection;
+import java.util.Collections;
+import org.jackhuang.hmcl.game.Library;
+import org.jackhuang.hmcl.util.Immutable;
+
+/**
+ *
+ * @author huangyuhui
+ */
+@Immutable
+public final class LiteLoaderVersion {
+    private final String tweakClass;
+    private final String file;
+    private final String version;
+    private final String md5;
+    private final String timestamp;
+    private final int lastSuccessfulBuild;
+    private final Collection<Library> libraries;
+
+    public LiteLoaderVersion() {
+        this("", "", "", "", "", 0, Collections.EMPTY_SET);
+    }
+
+    public LiteLoaderVersion(String tweakClass, String file, String version, String md5, String timestamp, int lastSuccessfulBuild, Collection<Library> libraries) {
+        this.tweakClass = tweakClass;
+        this.file = file;
+        this.version = version;
+        this.md5 = md5;
+        this.timestamp = timestamp;
+        this.lastSuccessfulBuild = lastSuccessfulBuild;
+        this.libraries = libraries;
+    }
+
+    public String getTweakClass() {
+        return tweakClass;
+    }
+
+    public String getFile() {
+        return file;
+    }
+
+    public String getVersion() {
+        return version;
+    }
+
+    public String getMd5() {
+        return md5;
+    }
+
+    public String getTimestamp() {
+        return timestamp;
+    }
+
+    public int getLastSuccessfulBuild() {
+        return lastSuccessfulBuild;
+    }
+
+    public Collection<Library> getLibraries() {
+        return Collections.unmodifiableCollection(libraries);
+    }
+    
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/liteloader/LiteLoaderVersionList.java

@@ -0,0 +1,91 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.liteloader;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
+import org.jackhuang.hmcl.download.DownloadProvider;
+import org.jackhuang.hmcl.download.RemoteVersion;
+import org.jackhuang.hmcl.download.VersionList;
+import org.jackhuang.hmcl.task.GetTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.Constants;
+import org.jackhuang.hmcl.util.NetworkUtils;
+import org.jackhuang.hmcl.util.VersionNumber;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class LiteLoaderVersionList extends VersionList<LiteLoaderRemoteVersionTag> {
+
+    public static final LiteLoaderVersionList INSTANCE = new LiteLoaderVersionList();
+
+    private LiteLoaderVersionList() {
+    }
+
+    @Override
+    public Task refreshAsync(DownloadProvider downloadProvider) {
+        GetTask task = new GetTask(NetworkUtils.toURL(downloadProvider.injectURL(LITELOADER_LIST)));
+        return new Task() {
+            @Override
+            public Collection<Task> getDependents() {
+                return Collections.singleton(task);
+            }
+
+            @Override
+            public void execute() throws Exception {
+                LiteLoaderVersionsRoot root = Constants.GSON.fromJson(task.getResult(), LiteLoaderVersionsRoot.class);
+                versions.clear();
+
+                for (Map.Entry<String, LiteLoaderGameVersions> entry : root.getVersions().entrySet()) {
+                    String gameVersion = entry.getKey();
+                    LiteLoaderGameVersions liteLoader = entry.getValue();
+                    String gg = VersionNumber.parseVersion(gameVersion);
+                    if (gg == null)
+                        continue;
+                    doBranch(gg, gameVersion, liteLoader.getRepoitory(), liteLoader.getArtifacts(), false);
+                    doBranch(gg, gameVersion, liteLoader.getRepoitory(), liteLoader.getSnapshots(), true);
+                }
+            }
+
+            private void doBranch(String key, String gameVersion, LiteLoaderRepository repository, LiteLoaderBranch branch, boolean snapshot) {
+                if (branch == null || repository == null)
+                    return;
+
+                for (Map.Entry<String, LiteLoaderVersion> entry : branch.getLiteLoader().entrySet()) {
+                    String branchName = entry.getKey();
+                    LiteLoaderVersion v = entry.getValue();
+                    if ("latest".equals(branchName))
+                        continue;
+
+                    versions.put(key, new RemoteVersion<>(gameVersion,
+                            v.getVersion().replace("SNAPSHOT", "SNAPSHOT-" + v.getLastSuccessfulBuild()),
+                            snapshot
+                                    ? "http://jenkins.liteloader.com/LiteLoader " + gameVersion + "/lastSuccessfulBuild/artifact/build/libs/liteloader-" + v.getVersion() + "-release.jar"
+                                    : downloadProvider.injectURL(repository.getUrl() + "com/mumfrey/liteloader/" + gameVersion + "/" + v.getFile()),
+                            new LiteLoaderRemoteVersionTag(v.getTweakClass(), v.getLibraries())
+                    ));
+                }
+            }
+        };
+    }
+
+    public static final String LITELOADER_LIST = "http://dl.liteloader.com/versions/versions.json";
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/liteloader/LiteLoaderVersionsMeta.java

@@ -0,0 +1,61 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.liteloader;
+
+import com.google.gson.annotations.SerializedName;
+import org.jackhuang.hmcl.util.Immutable;
+
+/**
+ *
+ * @author huangyuhui
+ */
+@Immutable
+public final class LiteLoaderVersionsMeta {
+
+    @SerializedName("description")
+    private final String description;
+
+    @SerializedName("authors")
+    private final String authors;
+
+    @SerializedName("url")
+    private final String url;
+
+    public LiteLoaderVersionsMeta() {
+        this("", "", "");
+    }
+
+    public LiteLoaderVersionsMeta(String description, String authors, String url) {
+        this.description = description;
+        this.authors = authors;
+        this.url = url;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public String getAuthors() {
+        return authors;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/liteloader/LiteLoaderVersionsRoot.java

@@ -0,0 +1,55 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.liteloader;
+
+import com.google.gson.annotations.SerializedName;
+import java.util.Collections;
+import java.util.Map;
+import org.jackhuang.hmcl.util.Immutable;
+
+/**
+ *
+ * @author huangyuhui
+ */
+@Immutable
+public final class LiteLoaderVersionsRoot {
+
+    @SerializedName("versions")
+    private final Map<String, LiteLoaderGameVersions> versions;
+
+    @SerializedName("meta")
+    private final LiteLoaderVersionsMeta meta;
+
+    public LiteLoaderVersionsRoot() {
+        this(Collections.EMPTY_MAP, null);
+    }
+
+    public LiteLoaderVersionsRoot(Map<String, LiteLoaderGameVersions> versions, LiteLoaderVersionsMeta meta) {
+        this.versions = versions;
+        this.meta = meta;
+    }
+
+    public Map<String, LiteLoaderGameVersions> getVersions() {
+        return Collections.unmodifiableMap(versions);
+    }
+
+    public LiteLoaderVersionsMeta getMeta() {
+        return meta;
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/optifine/OptiFineBMCLVersionList.java

@@ -0,0 +1,79 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.optifine;
+
+import com.google.gson.reflect.TypeToken;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import org.jackhuang.hmcl.download.DownloadProvider;
+import org.jackhuang.hmcl.download.RemoteVersion;
+import org.jackhuang.hmcl.download.VersionList;
+import org.jackhuang.hmcl.task.GetTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.Constants;
+import org.jackhuang.hmcl.util.NetworkUtils;
+import org.jackhuang.hmcl.util.StringUtils;
+import org.jackhuang.hmcl.util.VersionNumber;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class OptiFineBMCLVersionList extends VersionList<Void> {
+
+    public static final OptiFineBMCLVersionList INSTANCE = new OptiFineBMCLVersionList();
+
+    private OptiFineBMCLVersionList() {
+    }
+
+    @Override
+    public Task refreshAsync(DownloadProvider downloadProvider) {
+        GetTask task = new GetTask(NetworkUtils.toURL("http://bmclapi.bangbang93.com/optifine/versionlist"));
+        return new Task() {
+            @Override
+            public Collection<Task> getDependents() {
+                return Collections.singleton(task);
+            }
+
+            @Override
+            public void execute() throws Exception {
+                versions.clear();
+                Set<String> duplicates = new HashSet<>();
+                List<OptiFineVersion> root = Constants.GSON.fromJson(task.getResult(), new TypeToken<List<OptiFineVersion>>() {
+                }.getType());
+                for (OptiFineVersion element : root) {
+                    String version = element.getType();
+                    if (version == null)
+                        continue;
+                    String mirror = "http://bmclapi2.bangbang93.com/optifine/" + element.getGameVersion() + "/" + element.getType() + "/" + element.getPatch();
+                    if (!duplicates.add(mirror))
+                        continue;
+
+                    if (StringUtils.isBlank(element.getGameVersion()))
+                        continue;
+                    String gameVersion = VersionNumber.parseVersion(element.getGameVersion());
+                    versions.put(gameVersion, new RemoteVersion<>(gameVersion, version, mirror, null));
+                }
+            }
+        };
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/optifine/OptiFineDownloadFormatter.java

@@ -0,0 +1,56 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.optifine;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.jackhuang.hmcl.task.TaskResult;
+import org.jackhuang.hmcl.util.NetworkUtils;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class OptiFineDownloadFormatter extends TaskResult<String> {
+
+    private final String url;
+
+    public OptiFineDownloadFormatter(String url) {
+        this.url = url;
+    }
+
+    @Override
+    public void execute() throws Exception {
+        String result = null;
+        String content = NetworkUtils.doGet(NetworkUtils.toURL(url));
+        Matcher m = PATTERN.matcher(content);
+        while (m.find())
+            result = m.group(1);
+        if (result == null)
+            throw new IllegalStateException("Cannot find version in " + content);
+        setResult("http://optifine.net/downloadx?f=OptiFine" + result);
+    }
+
+    @Override
+    public String getId() {
+        return ID;
+    }
+
+    public static final String ID = "optifine_formatter";
+    private static final Pattern PATTERN = Pattern.compile("\"downloadx\\?f=OptiFine(.*)\"");
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/optifine/OptiFineInstallTask.java

@@ -0,0 +1,142 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.optifine;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+import org.jackhuang.hmcl.download.DefaultDependencyManager;
+import org.jackhuang.hmcl.download.RemoteVersion;
+import org.jackhuang.hmcl.download.VersionList;
+import org.jackhuang.hmcl.download.game.GameLibrariesTask;
+import org.jackhuang.hmcl.game.Argument;
+import org.jackhuang.hmcl.game.Arguments;
+import org.jackhuang.hmcl.game.LibrariesDownloadInfo;
+import org.jackhuang.hmcl.game.Library;
+import org.jackhuang.hmcl.game.LibraryDownloadInfo;
+import org.jackhuang.hmcl.game.StringArgument;
+import org.jackhuang.hmcl.game.Version;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.task.TaskResult;
+import org.jackhuang.hmcl.util.Lang;
+
+/**
+ * <b>Note</b>: OptiFine should be installed in the end.
+ *
+ * @author huangyuhui
+ */
+public final class OptiFineInstallTask extends TaskResult<Version> {
+
+    private final DefaultDependencyManager dependencyManager;
+    private final String gameVersion;
+    private final Version version;
+    private final String remoteVersion;
+    private final VersionList<?> optiFineVersionList;
+    private RemoteVersion<?> remote;
+    private final List<Task> dependents = new LinkedList<>();
+    private final List<Task> dependencies = new LinkedList<>();
+
+    private void doRemote() {
+        remote = optiFineVersionList.getVersion(gameVersion, remoteVersion)
+                .orElseThrow(() -> new IllegalArgumentException("Remote OptiFine version " + gameVersion + ", " + remoteVersion + " not found"));
+    }
+
+    public OptiFineInstallTask(DefaultDependencyManager dependencyManager, String gameVersion, Version version, String remoteVersion) {
+        this.dependencyManager = dependencyManager;
+        this.gameVersion = gameVersion;
+        this.version = version;
+        this.remoteVersion = remoteVersion;
+
+        optiFineVersionList = dependencyManager.getVersionList("optifine");
+
+        if (!optiFineVersionList.isLoaded())
+            dependents.add(optiFineVersionList.refreshAsync(dependencyManager.getDownloadProvider())
+                    .then(s -> {
+                        doRemote();
+                        return null;
+                    }));
+        else
+            doRemote();
+    }
+
+    @Override
+    public Collection<Task> getDependents() {
+        return dependents;
+    }
+
+    @Override
+    public Collection<Task> getDependencies() {
+        return dependencies;
+    }
+
+    @Override
+    public String getId() {
+        return "version";
+    }
+
+    @Override
+    public boolean isRelyingOnDependencies() {
+        return false;
+    }
+
+    @Override
+    public void execute() throws Exception {
+        Library library = new Library(
+                "net.optifine", "optifine", remoteVersion, null, null,
+                new LibrariesDownloadInfo(new LibraryDownloadInfo(
+                        "net/optifine/optifine/" + remoteVersion + "/optifine-" + remoteVersion + ".jar",
+                        remote.getUrl())), true
+        );
+
+        List<Library> libraries = new LinkedList<>();
+        libraries.add(library);
+
+        boolean hasFMLTweaker = false;
+        if (version.getMinecraftArguments().isPresent() && version.getMinecraftArguments().get().contains("FMLTweaker"))
+            hasFMLTweaker = true;
+        if (version.getArguments().isPresent()) {
+            List<Argument> game = version.getArguments().get().getGame();
+            if (game.stream().anyMatch(arg -> arg.toString(Collections.EMPTY_MAP, Collections.EMPTY_MAP).contains("FMLTweaker")))
+                hasFMLTweaker = true;
+        }
+
+        /*Arguments arguments = Lang.get(version.getArguments());
+
+        if (!hasFMLTweaker)
+            arguments = Arguments.addGameArguments(arguments, "--tweakClass", "optifine.OptiFineTweaker");
+            */
+        String minecraftArguments = version.getMinecraftArguments().orElse("");
+        if (!hasFMLTweaker)
+            minecraftArguments = minecraftArguments + " --tweakClass optifine.OptiFineTweaker";
+
+        if (version.getMainClass() == null || !version.getMainClass().startsWith("net.minecraft.launchwrapper."))
+            libraries.add(0, new Library("net.minecraft", "launchwrapper", "1.12"));
+
+        setResult(version
+                        .setLibraries(Lang.merge(version.getLibraries(), libraries))
+                        .setMainClass("net.minecraft.launchwrapper.Launch")
+                        .setMinecraftArguments(minecraftArguments)
+                //.setArguments(arguments)
+        );
+
+        dependencies.add(new GameLibrariesTask(dependencyManager, version.setLibraries(libraries)));
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/optifine/OptiFineVersion.java

@@ -0,0 +1,90 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.optifine;
+
+import com.google.gson.annotations.SerializedName;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class OptiFineVersion {
+
+    @SerializedName("dl")
+    private final String downloadLink;
+
+    @SerializedName("ver")
+    private final String version;
+
+    @SerializedName("date")
+    private final String date;
+
+    @SerializedName("type")
+    private final String type;
+
+    @SerializedName("patch")
+    private final String patch;
+
+    @SerializedName("mirror")
+    private final String mirror;
+
+    @SerializedName("mcversion")
+    private final String gameVersion;
+
+    public OptiFineVersion() {
+        this(null, null, null, null, null, null, null);
+    }
+
+    public OptiFineVersion(String downloadLink, String version, String date, String type, String patch, String mirror, String gameVersion) {
+        this.downloadLink = downloadLink;
+        this.version = version;
+        this.date = date;
+        this.type = type;
+        this.patch = patch;
+        this.mirror = mirror;
+        this.gameVersion = gameVersion;
+    }
+
+    public String getDownloadLink() {
+        return downloadLink;
+    }
+
+    public String getVersion() {
+        return version;
+    }
+
+    public String getDate() {
+        return date;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public String getPatch() {
+        return patch;
+    }
+
+    public String getMirror() {
+        return mirror;
+    }
+
+    public String getGameVersion() {
+        return gameVersion;
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/optifine/OptiFineVersionList.java

@@ -0,0 +1,96 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.download.optifine;
+
+import java.io.ByteArrayInputStream;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import org.jackhuang.hmcl.download.DownloadProvider;
+import org.jackhuang.hmcl.download.RemoteVersion;
+import org.jackhuang.hmcl.download.VersionList;
+import org.jackhuang.hmcl.task.GetTask;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.util.NetworkUtils;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.NodeList;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class OptiFineVersionList extends VersionList<Void> {
+
+    private static final Pattern PATTERN = Pattern.compile("OptiFine (.*?) ");
+    public static final OptiFineVersionList INSTANCE = new OptiFineVersionList();
+
+    private OptiFineVersionList() {
+    }
+
+    @Override
+    public Task refreshAsync(DownloadProvider downloadProvider) {
+        GetTask task = new GetTask(NetworkUtils.toURL("http://optifine.net/downloads"));
+        return new Task() {
+            @Override
+            public Collection<Task> getDependents() {
+                return Collections.singleton(task);
+            }
+
+            @Override
+            public void execute() throws Exception {
+                versions.clear();
+
+                String html = task.getResult().replace("&nbsp;", " ").replace("&gt;", ">").replace("&lt;", "<").replace("<br>", "<br />");
+
+                DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
+                DocumentBuilder db = factory.newDocumentBuilder();
+                Document doc = db.parse(new ByteArrayInputStream(html.getBytes("UTF-8")));
+                Element r = doc.getDocumentElement();
+                NodeList tables = r.getElementsByTagName("table");
+                for (int i = 0; i < tables.getLength(); i++) {
+                    Element e = (Element) tables.item(i);
+                    if ("downloadTable".equals(e.getAttribute("class"))) {
+                        NodeList tr = e.getElementsByTagName("tr");
+                        for (int k = 0; k < tr.getLength(); k++) {
+                            NodeList downloadLine = ((Element) tr.item(k)).getElementsByTagName("td");
+                            String url = null, version = null, gameVersion = null;
+                            for (int j = 0; j < downloadLine.getLength(); j++) {
+                                Element td = (Element) downloadLine.item(j);
+                                if (td.getAttribute("class") != null && td.getAttribute("class").startsWith("downloadLineMirror"))
+                                    url = ((Element) td.getElementsByTagName("a").item(0)).getAttribute("href");
+                                if (td.getAttribute("class") != null && td.getAttribute("class").startsWith("downloadLineFile"))
+                                    version = td.getTextContent();
+                            }
+                            Matcher matcher = PATTERN.matcher(version);
+                            while (matcher.find())
+                                gameVersion = matcher.group(1);
+                            if (gameVersion == null || version == null || url == null)
+                                continue;
+                            versions.put(gameVersion, new RemoteVersion<>(gameVersion, version, url, null));
+                        }
+                    }
+                }
+            }
+        };
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/event/Event.java

@@ -0,0 +1,85 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.event;
+
+import java.util.EventObject;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public class Event extends EventObject {
+
+    public Event(Object source) {
+        super(source);
+    }
+
+    private boolean canceled;
+
+    /**
+     * true if this event is canceled.
+     *
+     * @throws UnsupportedOperationException if trying to cancel a non-cancelable event.
+     */
+    public final boolean isCanceled() {
+        return canceled;
+    }
+
+    /**
+     *
+     * @param canceled new value
+     * @throws UnsupportedOperationException if trying to cancel a non-cancelable event.
+     */
+    public final void setCanceled(boolean canceled) {
+        if (!isCancelable())
+            throw new UnsupportedOperationException("Attempted to cancel a non-cancelable event: " + getClass());
+        this.canceled = canceled;
+    }
+
+    /**
+     * true if this Event this cancelable.
+     */
+    public boolean isCancelable() {
+        return false;
+    }
+
+    public boolean hasResult() {
+        return false;
+    }
+
+    private Result result;
+
+    /**
+     * Retutns the value set as the result of this event
+     */
+    public Result getResult() {
+        return result;
+    }
+
+    public void setResult(Result result) {
+        if (!hasResult())
+            throw new UnsupportedOperationException("Attempted to set result on a no result event: " + this.getClass() + " of type.");
+        this.result = result;
+    }
+
+    public enum Result {
+        DENY,
+        DEFAULT,
+        ALLOW
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/event/EventBus.java

@@ -0,0 +1,43 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.event;
+
+import java.util.EventObject;
+import java.util.HashMap;
+import org.jackhuang.hmcl.task.Schedulers;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class EventBus {
+
+    private final HashMap<Class<?>, EventManager<?>> events = new HashMap<>();
+
+    public <T extends EventObject> EventManager<T> channel(Class<T> clazz) {
+        if (!events.containsKey(clazz))
+            events.put(clazz, new EventManager<>(Schedulers.computation()));
+        return (EventManager<T>) events.get(clazz);
+    }
+
+    public void fireEvent(EventObject obj) {
+        channel((Class<EventObject>) obj.getClass()).fireEvent(obj);
+    }
+
+    public static final EventBus EVENT_BUS = new EventBus();
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/event/EventManager.java

@@ -0,0 +1,85 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.event;
+
+import java.util.EnumMap;
+import java.util.EventObject;
+import java.util.HashSet;
+import java.util.function.Consumer;
+import org.jackhuang.hmcl.task.Scheduler;
+import org.jackhuang.hmcl.task.Schedulers;
+import org.jackhuang.hmcl.util.SimpleMultimap;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public final class EventManager<T extends EventObject> {
+
+    private final Scheduler scheduler;
+    private final SimpleMultimap<EventPriority, Consumer<T>> handlers
+            = new SimpleMultimap<>(() -> new EnumMap<>(EventPriority.class), HashSet::new);
+    private final SimpleMultimap<EventPriority, Runnable> handlers2
+            = new SimpleMultimap<>(() -> new EnumMap<>(EventPriority.class), HashSet::new);
+
+    public EventManager() {
+        this(Schedulers.immediate());
+    }
+
+    public EventManager(Scheduler scheduler) {
+        this.scheduler = scheduler;
+    }
+
+    public void register(Consumer<T> consumer) {
+        register(consumer, EventPriority.NORMAL);
+    }
+
+    public void register(Consumer<T> consumer, EventPriority priority) {
+        if (!handlers.get(priority).contains(consumer))
+            handlers.put(priority, consumer);
+    }
+
+    public void register(Runnable runnable) {
+        register(runnable, EventPriority.NORMAL);
+    }
+
+    public void register(Runnable runnable, EventPriority priority) {
+        if (!handlers2.get(priority).contains(runnable))
+            handlers2.put(priority, runnable);
+    }
+
+    public void unregister(Consumer<T> consumer) {
+        handlers.removeValue(consumer);
+    }
+
+    public void unregister(Runnable runnable) {
+        handlers2.removeValue(runnable);
+    }
+
+    public void fireEvent(T event) {
+        scheduler.schedule(() -> {
+            for (EventPriority priority : EventPriority.values()) {
+                for (Consumer<T> handler : handlers.get(priority))
+                    handler.accept(event);
+                for (Runnable runnable : handlers2.get(priority))
+                    runnable.run();
+            }
+        });
+    }
+
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/event/EventPriority.java

@@ -15,12 +15,16 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hmcl.event
+package org.jackhuang.hmcl.event;
 
-enum class EventPriority {
+/**
+ *
+ * @author huangyuhui
+ */
+public enum EventPriority {
     HIGHEST,
     HIGH,
     NORMAL,
     LOW,
     LOWEST
-}
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/event/FailedEvent.java

@@ -0,0 +1,49 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2017  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.event;
+
+import java.util.EventObject;
+
+/**
+ *
+ * @author huang
+ */
+public class FailedEvent<T> extends EventObject {
+
+    private final int failedTime;
+    private T newResult;
+
+    public FailedEvent(Object source, int failedTime, T newResult) {
+        super(source);
+        this.failedTime = failedTime;
+        this.newResult = newResult;
+    }
+
+    public int getFailedTime() {
+        return failedTime;
+    }
+
+    public T getNewResult() {
+        return newResult;
+    }
+
+    public void setNewResult(T newResult) {
+        this.newResult = newResult;
+    }
+
+}