rx.internal.operators.OperatorSubscribeOn Maven / Gradle / Ivy
/**
* 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.internal.operators;
import rx.*;
import rx.Observable.OnSubscribe;
import rx.Scheduler.Worker;
import rx.functions.Action0;
/**
* Subscribes Observers on the specified {@code Scheduler}.
*
* 
*
* @param the value type of the actual source
*/
public final class OperatorSubscribeOn implements OnSubscribe {
final Scheduler scheduler;
final Observable source;
final boolean requestOn;
public OperatorSubscribeOn(Observable source, Scheduler scheduler, boolean requestOn) {
this.scheduler = scheduler;
this.source = source;
this.requestOn = requestOn;
}
@Override
public void call(final Subscriber subscriber) {
final Worker inner = scheduler.createWorker();
SubscribeOnSubscriber parent = new SubscribeOnSubscriber(subscriber, requestOn, inner, source);
subscriber.add(parent);
subscriber.add(inner);
inner.schedule(parent);
}
static final class SubscribeOnSubscriber extends Subscriber implements Action0 {
final Subscriber actual;
final boolean requestOn;
final Worker worker;
Observable source;
Thread t;
SubscribeOnSubscriber(Subscriber actual, boolean requestOn, Worker worker, Observable source) {
this.actual = actual;
this.requestOn = requestOn;
this.worker = worker;
this.source = source;
}
@Override
public void onNext(T t) {
actual.onNext(t);
}
@Override
public void onError(Throwable e) {
try {
actual.onError(e);
} finally {
worker.unsubscribe();
}
}
@Override
public void onCompleted() {
try {
actual.onCompleted();
} finally {
worker.unsubscribe();
}
}
@Override
public void call() {
Observable src = source;
source = null;
t = Thread.currentThread();
src.unsafeSubscribe(this);
}
@Override
public void setProducer(final Producer p) {
actual.setProducer(new Producer() {
@Override
public void request(final long n) {
if (t == Thread.currentThread() || !requestOn) {
p.request(n);
} else {
worker.schedule(new Action0() {
@Override
public void call() {
p.request(n);
}
});
}
}
});
}
}
}