reactor.rx.action.metrics.CountAction Maven / Gradle / Ivy
/*
* Copyright (c) 2011-2014 Pivotal Software, 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 reactor.rx.action.metrics;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import reactor.rx.action.Action;
import reactor.rx.subscription.PushSubscription;
import java.util.concurrent.atomic.AtomicLong;
/**
* @author Stephane Maldini
* @since 1.1
*/
public class CountAction extends Action {
private final AtomicLong counter = new AtomicLong(0l);
private final Long i;
public CountAction(long i) {
this.i = i;
}
@Override
public void subscribe(final Subscriber subscriber) {
PushSubscription sub = upstreamSubscription;
if(sub != null && sub.isComplete()){
subscriber.onSubscribe(new Subscription() {
@Override
public void request(long n) {
subscriber.onNext(counter.get());
subscriber.onComplete();
}
@Override
public void cancel() {
}
});
}else{
super.subscribe(subscriber);
}
}
@Override
protected void doNext(T value) {
long counter = this.counter.incrementAndGet();
if (i != null && counter % i == 0l) {
broadcastNext(counter);
}
}
@Override
protected void doComplete() {
broadcastNext(counter.get());
super.doComplete();
}
}