org.apache.mina.core.future.CompositeIoFuture Maven / Gradle / Ivy
/**
* Copyright 2007-2015, Kaazing Corporation. 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 org.apache.mina.core.future;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.mina.core.IoUtil;
/**
* An {@link IoFuture} of {@link IoFuture}s. It is useful when you want to
* get notified when all {@link IoFuture}s are complete. It is not recommended
* to use {@link CompositeIoFuture} if you just want to wait for all futures.
* In that case, please use {@link IoUtil#await(Iterable)} instead
* for better performance.
*
* @author Apache MINA Project
*
* @param the type of the child futures.
*/
public class CompositeIoFuture extends DefaultIoFuture {
private final NotifyingListener listener = new NotifyingListener();
private final AtomicInteger unnotified = new AtomicInteger();
private volatile boolean constructionFinished;
public CompositeIoFuture(Iterable children) {
super(null);
for (E f: children) {
f.addListener(listener);
unnotified.incrementAndGet();
}
constructionFinished = true;
if (unnotified.get() == 0) {
setValue(true);
}
}
private class NotifyingListener implements IoFutureListener {
public void operationComplete(IoFuture future) {
if (unnotified.decrementAndGet() == 0 && constructionFinished) {
setValue(true);
}
}
}
}