重构 FutureCallback (#5268)

HMCLCore/src/main/java/org/jackhuang/hmcl/util/FutureCallback.java

@@ -17,18 +17,23 @@
  */
 package org.jackhuang.hmcl.util;
 
-import java.util.function.Consumer;
-
 @FunctionalInterface
 public interface FutureCallback<T> {
 
-    /**
-     * Callback of future, called after future finishes.
-     * This callback gives the feedback whether the result of future is acceptable or not,
-     * if not, giving the reason, and future will be relaunched when necessary.
-     * @param result result of the future
-     * @param resolve accept the result
-     * @param reject reject the result with failure reason
-     */
-    void call(T result, Runnable resolve, Consumer<String> reject);
+    /// Callback of future, called after future finishes.
+    /// This callback gives the feedback whether the result of future is acceptable or not,
+    /// if not, giving the reason, and future will be relaunched when necessary.
+    ///
+    /// @param result  result of the future
+    /// @param handler handler to accept or reject the result
+    void call(T result, ResultHandler handler);
+
+    interface ResultHandler {
+
+        /// Accept the result.
+        void resolve();
+
+        /// Reject the result with given reason.
+        void reject(String reason);
+    }
 }