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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.Beta;
import rx.internal.util.SubscriptionList;
/**
* Provides a mechanism for receiving push-based notifications.
* <p>
* 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 <a href="http://reactivex.io/documentation/observable.html">ReactiveX documentation: Observable</a>
* @param <T>
* the type of item the SingleSubscriber expects to observe
* @since (if this graduates from Experimental/Beta to supported, replace this parenthetical with the release number)
*/
@Beta
public abstract class SingleSubscriber<T> 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.
* <p>
* 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.
* <p>
* 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 <em>is</em> 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();
}
}