2008-08-08 02:37:18 +02:00
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/*
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2008-08-08 03:27:24 +02:00
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* JBoss, Home of Professional Open Source
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2008-08-08 02:37:18 +02:00
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*
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2008-08-08 03:27:24 +02:00
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* Copyright 2008, Red Hat Middleware LLC, and individual contributors
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* by the @author tags. See the COPYRIGHT.txt in the distribution for a
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* full listing of individual contributors.
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2008-08-08 02:37:18 +02:00
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*
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2008-08-08 03:27:24 +02:00
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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2008-08-08 02:37:18 +02:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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2008-08-08 03:27:24 +02:00
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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2008-08-08 02:37:18 +02:00
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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2008-08-08 03:27:24 +02:00
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* License along with this software; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
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2008-08-08 02:37:18 +02:00
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*/
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2008-08-08 03:40:10 +02:00
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package org.jboss.netty.channel;
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2008-08-08 02:37:18 +02:00
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2008-11-07 04:00:19 +01:00
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import static java.util.concurrent.TimeUnit.*;
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2008-08-08 02:37:18 +02:00
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.TimeUnit;
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2008-08-09 16:52:19 +02:00
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import org.jboss.netty.logging.InternalLogger;
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2008-08-09 17:05:53 +02:00
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import org.jboss.netty.logging.InternalLoggerFactory;
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2009-04-06 09:09:11 +02:00
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import org.jboss.netty.util.internal.IoWorkerRunnable;
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2008-08-08 02:37:18 +02:00
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2008-08-11 09:33:19 +02:00
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/**
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2008-09-02 09:13:20 +02:00
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* The default {@link ChannelFuture} implementation. It is recommended to
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* use {@link Channels#future(Channel)} and {@link Channels#future(Channel, boolean)}
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* to create a new {@link ChannelFuture} rather than calling the constructor
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* explicitly.
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2008-08-11 09:33:19 +02:00
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*
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* @author The Netty Project (netty-dev@lists.jboss.org)
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* @author Trustin Lee (tlee@redhat.com)
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*
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* @version $Rev$, $Date$
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*/
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2008-08-08 02:37:18 +02:00
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public class DefaultChannelFuture implements ChannelFuture {
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2008-08-09 16:52:19 +02:00
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private static final InternalLogger logger =
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2008-08-09 17:05:53 +02:00
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InternalLoggerFactory.getInstance(DefaultChannelFuture.class);
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2008-08-11 09:33:19 +02:00
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2008-08-08 02:37:18 +02:00
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private static final Throwable CANCELLED = new Throwable();
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private final Channel channel;
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private final boolean cancellable;
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2008-11-07 03:35:04 +01:00
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private volatile ChannelFutureListener firstListener;
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private volatile List<ChannelFutureListener> otherListeners;
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2008-08-08 02:37:18 +02:00
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private boolean done;
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private Throwable cause;
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private int waiters;
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2008-08-11 09:33:19 +02:00
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/**
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* Creates a new instance.
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*
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* @param channel
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* the {@link Channel} associated with this future
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* @param cancellable
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* {@code true} if and only if this future can be canceled
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*/
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2008-08-08 02:37:18 +02:00
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public DefaultChannelFuture(Channel channel, boolean cancellable) {
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this.channel = channel;
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this.cancellable = cancellable;
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}
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public Channel getChannel() {
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return channel;
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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 isSuccess() {
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2009-02-26 10:28:37 +01:00
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return done && cause == null;
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2008-08-08 02:37:18 +02:00
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}
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public synchronized Throwable getCause() {
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if (cause != CANCELLED) {
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return cause;
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} else {
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return null;
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}
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}
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public synchronized boolean isCancelled() {
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return cause == CANCELLED;
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}
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public void addListener(ChannelFutureListener 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<ChannelFutureListener>(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(ChannelFutureListener 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 ChannelFuture await() throws InterruptedException {
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synchronized (this) {
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while (!done) {
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2009-04-06 09:09:11 +02:00
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checkDeadLock();
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2008-08-08 02:37:18 +02:00
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waiters++;
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try {
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2008-08-19 12:21:04 +02:00
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this.wait();
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2008-08-08 02:37:18 +02:00
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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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2008-11-07 04:00:19 +01:00
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return await0(unit.toNanos(timeout), true);
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2008-08-08 02:37:18 +02:00
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}
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public boolean await(long timeoutMillis) throws InterruptedException {
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2008-11-07 04:00:19 +01:00
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return await0(MILLISECONDS.toNanos(timeoutMillis), true);
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2008-08-08 02:37:18 +02:00
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}
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public ChannelFuture awaitUninterruptibly() {
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synchronized (this) {
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while (!done) {
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2009-04-06 09:09:11 +02:00
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checkDeadLock();
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2008-08-08 02:37:18 +02:00
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waiters++;
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try {
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2008-08-19 12:21:04 +02:00
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this.wait();
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2008-08-08 02:37:18 +02:00
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} catch (InterruptedException e) {
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// Ignore.
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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 awaitUninterruptibly(long timeout, TimeUnit unit) {
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2008-11-07 04:00:19 +01:00
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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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2008-08-08 02:37:18 +02:00
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}
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public boolean awaitUninterruptibly(long timeoutMillis) {
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try {
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2008-11-07 04:00:19 +01:00
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return await0(MILLISECONDS.toNanos(timeoutMillis), false);
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2008-08-08 02:37:18 +02:00
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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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2008-11-07 04:00:19 +01:00
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private boolean await0(long timeoutNanos, boolean interruptable) throws InterruptedException {
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long startTime = timeoutNanos <= 0 ? 0 : System.nanoTime();
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long waitTime = timeoutNanos;
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2008-08-08 02:37:18 +02:00
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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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2009-04-06 09:09:11 +02:00
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checkDeadLock();
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2008-08-08 02:37:18 +02:00
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waiters++;
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try {
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for (;;) {
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try {
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2008-11-07 04:00:19 +01:00
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this.wait(waitTime / 1000000, (int) (waitTime % 1000000));
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2008-08-08 02:37:18 +02:00
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} catch (InterruptedException e) {
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if (interruptable) {
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throw e;
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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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2008-11-07 04:00:19 +01:00
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waitTime = timeoutNanos - (System.nanoTime() - startTime);
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2008-08-08 02:37:18 +02:00
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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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}
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2009-04-06 09:09:11 +02:00
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private void checkDeadLock() {
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if (IoWorkerRunnable.IN_IO_THREAD.get()) {
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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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2009-04-23 08:56:41 +02:00
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"sudden performance drop. Use addListener() instead.");
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2009-04-06 09:09:11 +02:00
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}
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}
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2008-11-26 10:21:00 +01:00
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public boolean setSuccess() {
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2008-08-08 02:37:18 +02:00
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synchronized (this) {
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// Allow only once.
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if (done) {
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2008-11-26 10:21:00 +01:00
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return false;
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2008-08-08 02:37:18 +02:00
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}
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done = true;
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if (waiters > 0) {
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2008-11-26 10:21:00 +01:00
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notifyAll();
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2008-08-08 02:37:18 +02:00
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}
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}
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notifyListeners();
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2008-11-26 10:21:00 +01:00
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return true;
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2008-08-08 02:37:18 +02:00
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}
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2008-11-26 10:21:00 +01:00
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public boolean setFailure(Throwable cause) {
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2008-08-08 02:37:18 +02:00
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synchronized (this) {
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// Allow only once.
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if (done) {
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2008-11-26 10:21:00 +01:00
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return false;
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2008-08-08 02:37:18 +02:00
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}
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this.cause = cause;
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done = true;
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if (waiters > 0) {
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2008-11-26 10:21:00 +01:00
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notifyAll();
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2008-08-08 02:37:18 +02:00
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}
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}
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notifyListeners();
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2008-11-26 10:21:00 +01:00
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return true;
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2008-08-08 02:37:18 +02:00
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}
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public boolean cancel() {
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if (!cancellable) {
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return false;
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}
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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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cause = CANCELLED;
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done = true;
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if (waiters > 0) {
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2008-11-26 10:21:00 +01:00
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notifyAll();
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2008-08-08 02:37:18 +02:00
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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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// There won't be any visibility problem or concurrent modification
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// because 'ready' flag will be checked against both addListener and
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// removeListener calls.
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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 (ChannelFutureListener 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(ChannelFutureListener 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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