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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 <a href="http://mina.apache.org">Apache MINA Project</a>
*
* @param <E> the type of the child futures.
*/
public class CompositeIoFuture<E extends IoFuture> extends DefaultIoFuture {
private final NotifyingListener listener = new NotifyingListener();
private final AtomicInteger unnotified = new AtomicInteger();
private volatile boolean constructionFinished;
public CompositeIoFuture(Iterable<E> 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<IoFuture> {
public void operationComplete(IoFuture future) {
if (unnotified.decrementAndGet() == 0 && constructionFinished) {
setValue(true);
}
}
}
}
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