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Observer.java

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Observer.java

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/**
* Copyright 2014 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 {@link Observable#subscribe subscribe} method, the
* {@code Observable} calls the Observer's {@link #onNext} method to provide notifications. A well-behaved
* {@code Observable} will call an Observer's {@link #onCompleted} method exactly once or the Observer's
* {@link #onError} method exactly once.
*
* @see <a href="http://reactivex.io/documentation/observable.html">ReactiveX documentation: Observable</a>
* @param <T>
* the type of item the Observer expects to observe
*/
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 method if it calls {@link #onError}.
*/
void onCompleted();
/**
* Notifies the Observer that the {@link Observable} has experienced an error condition.
* <p>
* If the {@link Observable} calls this method, it will not thereafter call {@link #onNext} or
* {@link #onCompleted}.
*
* @param e
* the exception encountered by the Observable
*/
void onError(Throwable e);
/**
* Provides the Observer with a new item to observe.
* <p>
* The {@link Observable} may call this method 0 or more times.
* <p>
* The {@code Observable} will not call this method again after it calls either {@link #onCompleted} or
* {@link #onError}.
*
* @param t
* the item emitted by the Observable
*/
void onNext(T t);
}
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