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/** * Copyright 2015 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; import rx.annotations.Experimental; import rx.internal.util.SubscriptionList; /** * Provides a mechanism for receiving push-based notifications. *

* After a SingleSubscriber calls a {@link Single}'s {@link Single#subscribe subscribe} method, the * {@code Single} calls the SingleSubscriber's {@link #onSuccess} and {@link #onError} methods to provide * notifications. A well-behaved {@code Single} will call a SingleSubscriber's {@link #onSuccess} method exactly * once or the SingleSubscriber's {@link #onError} method exactly once. * * @see ReactiveX documentation: Observable * @param * the type of item the SingleSubscriber expects to observe */ @Experimental public abstract class SingleSubscriber implements Subscription { private final SubscriptionList cs = new SubscriptionList(); /** * Notifies the SingleSubscriber with a single item and that the {@link Single} has finished sending * push-based notifications. *

* The {@link Single} will not call this method if it calls {@link #onError}. * * @param value * the item emitted by the Single */ public abstract void onSuccess(T value); /** * Notifies the SingleSubscriber that the {@link Single} has experienced an error condition. *

* If the {@link Single} calls this method, it will not thereafter call {@link #onSuccess}. * * @param error * the exception encountered by the Single */ public abstract void onError(Throwable error); /** * Adds a {@link Subscription} to this Subscriber's list of subscriptions if this list is not marked as * unsubscribed. If the list is marked as unsubscribed, {@code add} will indicate this by * explicitly unsubscribing the new {@code Subscription} as well. * * @param s * the {@code Subscription} to add */ public final void add(Subscription s) { cs.add(s); } @Override public final void unsubscribe() { cs.unsubscribe(); } /** * Indicates whether this Subscriber has unsubscribed from its list of subscriptions. * * @return {@code true} if this Subscriber has unsubscribed from its subscriptions, {@code false} otherwise */ @Override public final boolean isUnsubscribed() { return cs.isUnsubscribed(); } }

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