rx.internal.operators.SingleFromEmitter Maven / Gradle / Ivy
/**
* Copyright 2016 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.internal.operators;
import java.util.concurrent.atomic.AtomicBoolean;
import rx.*;
import rx.Single.OnSubscribe;
import rx.exceptions.Exceptions;
import rx.functions.*;
import rx.internal.subscriptions.*;
import rx.plugins.RxJavaHooks;
/**
* Calls an action with a SingleEmitter instance for each individual subscribers that
* generates a terminal signal (eventually).
*
* @param the success value type
*/
public final class SingleFromEmitter implements OnSubscribe {
final Action1> producer;
public SingleFromEmitter(Action1> producer) {
this.producer = producer;
}
@Override
public void call(SingleSubscriber super T> t) {
SingleEmitterImpl parent = new SingleEmitterImpl(t);
t.add(parent);
try {
producer.call(parent);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
parent.onError(ex);
}
}
static final class SingleEmitterImpl
extends AtomicBoolean
implements SingleEmitter, Subscription {
private static final long serialVersionUID = 8082834163465882809L;
final SingleSubscriber super T> actual;
final SequentialSubscription resource;
SingleEmitterImpl(SingleSubscriber super T> actual) {
this.actual = actual;
this.resource = new SequentialSubscription();
}
@Override
public void unsubscribe() {
if (compareAndSet(false, true)) {
resource.unsubscribe();
}
}
@Override
public boolean isUnsubscribed() {
return get();
}
@Override
public void onSuccess(T t) {
if (compareAndSet(false, true)) {
try {
actual.onSuccess(t);
} finally {
resource.unsubscribe();
}
}
}
@Override
public void onError(Throwable t) {
if (t == null) {
t = new NullPointerException();
}
if (compareAndSet(false, true)) {
try {
actual.onError(t);
} finally {
resource.unsubscribe();
}
} else {
RxJavaHooks.onError(t);
}
}
@Override
public void setSubscription(Subscription s) {
resource.update(s);
}
@Override
public void setCancellation(Cancellable c) {
setSubscription(new CancellableSubscription(c));
}
}
}
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