a804c3495e
* Fixed incorrect isPartialSuccess(), isPartialFailure(), isCompleteFailure() implementation
378 lines
11 KiB
Java
378 lines
11 KiB
Java
/*
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* Copyright 2009 Red Hat, Inc.
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*
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* Red Hat licenses this file to you under the Apache License, version 2.0
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* (the "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package org.jboss.netty.channel.group;
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import static java.util.concurrent.TimeUnit.*;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.TimeUnit;
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import org.jboss.netty.channel.Channel;
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import org.jboss.netty.channel.ChannelFuture;
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import org.jboss.netty.channel.ChannelFutureListener;
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import org.jboss.netty.logging.InternalLogger;
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import org.jboss.netty.logging.InternalLoggerFactory;
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import org.jboss.netty.util.internal.DeadLockProofWorker;
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/**
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* The default {@link ChannelGroupFuture} implementation.
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*
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* @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
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* @author <a href="http://gleamynode.net/">Trustin Lee</a>
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*
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* @version $Rev: 2191 $, $Date: 2010-02-19 18:18:10 +0900 (Fri, 19 Feb 2010) $
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*/
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public class DefaultChannelGroupFuture implements ChannelGroupFuture {
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private static final InternalLogger logger =
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InternalLoggerFactory.getInstance(DefaultChannelGroupFuture.class);
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private final ChannelGroup group;
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final Map<Integer, ChannelFuture> futures;
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private ChannelGroupFutureListener firstListener;
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private List<ChannelGroupFutureListener> otherListeners;
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private boolean done;
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int successCount;
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int failureCount;
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private int waiters;
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private final ChannelFutureListener childListener = new ChannelFutureListener() {
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public void operationComplete(ChannelFuture future) throws Exception {
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boolean success = future.isSuccess();
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boolean callSetDone = false;
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synchronized (DefaultChannelGroupFuture.this) {
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if (success) {
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successCount ++;
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} else {
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failureCount ++;
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}
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callSetDone = successCount + failureCount == futures.size();
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assert successCount + failureCount <= futures.size();
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}
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if (callSetDone) {
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setDone();
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}
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}
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};
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/**
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* Creates a new instance.
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*/
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public DefaultChannelGroupFuture(ChannelGroup group, Collection<ChannelFuture> futures) {
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if (group == null) {
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throw new NullPointerException("group");
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}
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if (futures == null) {
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throw new NullPointerException("futures");
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}
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this.group = group;
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Map<Integer, ChannelFuture> futureMap = new LinkedHashMap<Integer, ChannelFuture>();
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for (ChannelFuture f: futures) {
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futureMap.put(f.getChannel().getId(), f);
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}
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this.futures = Collections.unmodifiableMap(futureMap);
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for (ChannelFuture f: this.futures.values()) {
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f.addListener(childListener);
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}
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// Done on arrival?
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if (this.futures.isEmpty()) {
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setDone();
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}
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}
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DefaultChannelGroupFuture(ChannelGroup group, Map<Integer, ChannelFuture> futures) {
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this.group = group;
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this.futures = Collections.unmodifiableMap(futures);
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for (ChannelFuture f: this.futures.values()) {
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f.addListener(childListener);
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}
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// Done on arrival?
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if (this.futures.isEmpty()) {
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setDone();
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}
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}
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public ChannelGroup getGroup() {
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return group;
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}
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public ChannelFuture find(Integer channelId) {
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return futures.get(channelId);
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}
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public ChannelFuture find(Channel channel) {
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return futures.get(channel.getId());
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}
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public Iterator<ChannelFuture> iterator() {
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return futures.values().iterator();
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}
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public synchronized boolean isDone() {
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return done;
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}
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public synchronized boolean isCompleteSuccess() {
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return successCount == futures.size();
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}
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public synchronized boolean isPartialSuccess() {
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return successCount != 0 && successCount != futures.size();
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}
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public synchronized boolean isPartialFailure() {
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return failureCount != 0 && failureCount != futures.size();
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}
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public synchronized boolean isCompleteFailure() {
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int futureCnt = futures.size();
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return futureCnt != 0 && failureCount == futureCnt;
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}
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public void addListener(ChannelGroupFutureListener listener) {
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if (listener == null) {
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throw new NullPointerException("listener");
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}
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boolean notifyNow = false;
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synchronized (this) {
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if (done) {
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notifyNow = true;
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} else {
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if (firstListener == null) {
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firstListener = listener;
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} else {
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if (otherListeners == null) {
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otherListeners = new ArrayList<ChannelGroupFutureListener>(1);
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}
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otherListeners.add(listener);
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}
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}
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}
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if (notifyNow) {
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notifyListener(listener);
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}
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}
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public void removeListener(ChannelGroupFutureListener listener) {
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if (listener == null) {
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throw new NullPointerException("listener");
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}
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synchronized (this) {
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if (!done) {
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if (listener == firstListener) {
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if (otherListeners != null && !otherListeners.isEmpty()) {
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firstListener = otherListeners.remove(0);
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} else {
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firstListener = null;
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}
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} else if (otherListeners != null) {
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otherListeners.remove(listener);
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}
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}
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}
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}
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public ChannelGroupFuture await() throws InterruptedException {
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if (Thread.interrupted()) {
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throw new InterruptedException();
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}
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synchronized (this) {
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while (!done) {
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checkDeadLock();
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waiters++;
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try {
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this.wait();
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} finally {
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waiters--;
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}
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}
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}
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return this;
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}
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public boolean await(long timeout, TimeUnit unit)
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throws InterruptedException {
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return await0(unit.toNanos(timeout), true);
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}
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public boolean await(long timeoutMillis) throws InterruptedException {
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return await0(MILLISECONDS.toNanos(timeoutMillis), true);
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}
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public ChannelGroupFuture awaitUninterruptibly() {
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boolean interrupted = false;
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synchronized (this) {
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while (!done) {
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checkDeadLock();
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waiters++;
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try {
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this.wait();
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} catch (InterruptedException e) {
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interrupted = true;
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} finally {
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waiters--;
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}
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}
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}
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if (interrupted) {
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Thread.currentThread().interrupt();
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}
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return this;
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}
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public boolean awaitUninterruptibly(long timeout, TimeUnit unit) {
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try {
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return await0(unit.toNanos(timeout), false);
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} catch (InterruptedException e) {
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throw new InternalError();
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}
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}
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public boolean awaitUninterruptibly(long timeoutMillis) {
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try {
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return await0(MILLISECONDS.toNanos(timeoutMillis), false);
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} catch (InterruptedException e) {
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throw new InternalError();
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}
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}
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private boolean await0(long timeoutNanos, boolean interruptable) throws InterruptedException {
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if (interruptable && Thread.interrupted()) {
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throw new InterruptedException();
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}
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long startTime = timeoutNanos <= 0 ? 0 : System.nanoTime();
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long waitTime = timeoutNanos;
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boolean interrupted = false;
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try {
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synchronized (this) {
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if (done) {
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return done;
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} else if (waitTime <= 0) {
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return done;
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}
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checkDeadLock();
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waiters++;
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try {
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for (;;) {
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try {
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this.wait(waitTime / 1000000, (int) (waitTime % 1000000));
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} catch (InterruptedException e) {
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if (interruptable) {
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throw e;
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} else {
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interrupted = true;
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}
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}
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if (done) {
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return true;
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} else {
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waitTime = timeoutNanos - (System.nanoTime() - startTime);
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if (waitTime <= 0) {
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return done;
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}
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}
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}
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} finally {
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waiters--;
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}
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}
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} finally {
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if (interrupted) {
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Thread.currentThread().interrupt();
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}
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}
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}
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private void checkDeadLock() {
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if (DeadLockProofWorker.PARENT.get() != null) {
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throw new IllegalStateException(
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"await*() in I/O thread causes a dead lock or " +
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"sudden performance drop. Use addListener() instead or " +
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"call await*() from a different thread.");
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}
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}
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boolean setDone() {
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synchronized (this) {
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// Allow only once.
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if (done) {
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return false;
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}
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done = true;
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if (waiters > 0) {
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notifyAll();
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}
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}
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notifyListeners();
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return true;
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}
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private void notifyListeners() {
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// This method doesn't need synchronization because:
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// 1) This method is always called after synchronized (this) block.
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// Hence any listener list modification happens-before this method.
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// 2) This method is called only when 'done' is true. Once 'done'
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// becomes true, the listener list is never modified - see add/removeListener()
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if (firstListener != null) {
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notifyListener(firstListener);
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firstListener = null;
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if (otherListeners != null) {
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for (ChannelGroupFutureListener l: otherListeners) {
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notifyListener(l);
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}
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otherListeners = null;
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}
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}
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}
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private void notifyListener(ChannelGroupFutureListener l) {
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try {
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l.operationComplete(this);
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} catch (Throwable t) {
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logger.warn(
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"An exception was thrown by " +
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ChannelFutureListener.class.getSimpleName() + ".", t);
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}
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}
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}
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