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/**
* 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(Throwable 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);
}