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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. *

* 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 ReactiveX documentation: Observable * @param * the type of item the Observer expects to observe */ public interface Observer { /** * Notifies the Observer that the {@link Observable} has finished sending push-based notifications. *

* 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. *

* 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. *

* The {@link Observable} may call this method 0 or more times. *

* 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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