reactor.rx.stream.SingleTimerStream Maven / Gradle / Ivy
/*
* Copyright (c) 2011-2015 Pivotal Software Inc., Inc. All Rights Reserved.
*
* 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 reactor.rx.stream;
import org.reactivestreams.Subscriber;
import reactor.core.support.Exceptions;
import reactor.fn.Consumer;
import reactor.fn.Pausable;
import reactor.fn.timer.Timer;
import reactor.rx.Stream;
import reactor.rx.subscription.PushSubscription;
import java.util.concurrent.TimeUnit;
/**
* A Stream that emits {@link 0} after an initial delay and then complete
*
* The SingleTimerStream will manage dedicated timers for new subscriber assigned via
* {@link this#subscribe(org.reactivestreams.Subscriber)}.
*
* Create such stream with the provided factory, E.g.:
*
* {@code
* Streams.timer(env, 1).consume(
*log::info,
*log::error,
* (-> log.info("complete"))
* )
* }
*
* Will log:
*
* {@code
* 0
* complete
* }
*
*
* @author Stephane Maldini
*/
public final class SingleTimerStream extends Stream {
final private long delay;
final private TimeUnit unit;
final private Timer timer;
public SingleTimerStream(long delay, TimeUnit unit, Timer timer) {
this.delay = delay >= 0l ? delay : 0l;
this.unit = unit != null ? unit : TimeUnit.SECONDS;
this.timer = timer;
}
@Override
public void subscribe(final Subscriber subscriber) {
try {
subscriber.onSubscribe(new TimerSubscription(this, subscriber));
}catch (Throwable throwable){
Exceptions.throwIfFatal(throwable);
subscriber.onError(throwable);
}
}
private class TimerSubscription extends PushSubscription{
final Pausable registration = timer.submit(new Consumer() {
@Override
public void accept(Long aLong) {
subscriber.onNext(0l);
subscriber.onComplete();
}
}, delay, unit);
public TimerSubscription(Stream publisher, Subscriber subscriber) {
super(publisher, subscriber);
}
@Override
public void cancel() {
registration.cancel();
super.cancel();
}
}
@Override
public String toString() {
return "delay=" + delay + " " + unit;
}
}