Change the license to GPL v3 to be compatible with Apache License 2.0.

HMCLAPI/src/main/java/rx/Observer.java

@@ -0,0 +1,57 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package rx;
+
+/**
+ * Provides a mechanism for receiving push-based notifications.
+ * <p>
+ * After an Observer calls an {@link Observable}'s <code>Observable.subscribe</code> method, the {@link Observable} calls the Observer's <code>onNext</code> method to provide notifications. A
+ * well-behaved {@link Observable} will
+ * call an Observer's <code>onCompleted</code> closure exactly once or the Observer's <code>onError</code> closure exactly once.
+ * <p>
+ * For more information see the <a href="https://github.com/Netflix/RxJava/wiki/Observable">RxJava Wiki</a>
+ * 
+ * @param <T>
+ */
+public interface Observer<T> {
+
+    /**
+     * Notifies the Observer that the {@link Observable} has finished sending push-based notifications.
+     * <p>
+     * The {@link Observable} will not call this closure if it calls <code>onError</code>.
+     */
+    public void onCompleted();
+
+    /**
+     * Notifies the Observer that the {@link Observable} has experienced an error condition.
+     * <p>
+     * If the {@link Observable} calls this closure, it will not thereafter call <code>onNext</code> or <code>onCompleted</code>.
+     * 
+     * @param e
+     */
+    public void onError(Exception e);
+
+    /**
+     * Provides the Observer with new data.
+     * <p>
+     * The {@link Observable} calls this closure 1 or more times, unless it calls <code>onError</code> in which case this closure may never be called.
+     * <p>
+     * The {@link Observable} will not call this closure again after it calls either <code>onCompleted</code> or <code>onError</code>.
+     * 
+     * @param args
+     */
+    public void onNext(T args);
+}