/**
* 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.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.
* <p>
* Note, that if you want {@link #isUnsubscribed} to return {@code true} after {@link #onSuccess} or {@link #onError}
* invocation, you need to invoke {@link #unsubscribe} in these methods.
*
* @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 1.2
*/
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 t
* the item emitted by the Single
*/
public abstract void
onSuccess(T
t);
/**
* 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();
}
}