2009-01-19 16:05:04 +01:00
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/*
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* JBoss, Home of Professional Open Source
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*
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* Copyright 2009, 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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*
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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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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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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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* 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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*/
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2009-02-05 05:57:56 +01:00
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package org.jboss.netty.handler.timeout;
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2009-01-19 16:05:04 +01:00
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import java.util.ArrayList;
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2009-01-20 13:14:29 +01:00
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import java.util.Collections;
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import java.util.HashSet;
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2009-01-19 16:05:04 +01:00
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import java.util.List;
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import java.util.Set;
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2009-01-20 13:17:56 +01:00
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import java.util.concurrent.Executors;
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2009-01-20 12:04:27 +01:00
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import java.util.concurrent.ThreadFactory;
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2009-01-19 16:05:04 +01:00
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import java.util.concurrent.TimeUnit;
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2009-01-20 12:04:27 +01:00
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import java.util.concurrent.atomic.AtomicBoolean;
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2009-01-20 12:35:04 +01:00
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import java.util.concurrent.atomic.AtomicInteger;
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2009-01-19 16:05:04 +01:00
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import java.util.concurrent.locks.ReadWriteLock;
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import java.util.concurrent.locks.ReentrantReadWriteLock;
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2009-01-20 05:39:11 +01:00
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import org.jboss.netty.logging.InternalLogger;
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import org.jboss.netty.logging.InternalLoggerFactory;
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2009-01-20 08:57:45 +01:00
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import org.jboss.netty.util.ConcurrentIdentityHashMap;
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2009-01-20 05:37:26 +01:00
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import org.jboss.netty.util.MapBackedSet;
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2009-01-20 08:57:45 +01:00
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import org.jboss.netty.util.ReusableIterator;
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2009-01-20 12:35:04 +01:00
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import org.jboss.netty.util.ThreadRenamingRunnable;
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2009-01-20 05:37:26 +01:00
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2009-01-19 16:05:04 +01:00
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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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* @version $Rev$, $Date$
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*/
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public class HashedWheelTimer implements Timer {
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2009-01-20 05:39:11 +01:00
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static final InternalLogger logger =
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InternalLoggerFactory.getInstance(HashedWheelTimer.class);
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2009-01-20 12:35:04 +01:00
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private static final AtomicInteger id = new AtomicInteger();
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2009-01-20 05:39:11 +01:00
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2009-01-20 12:04:27 +01:00
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private final Worker worker = new Worker();
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2009-01-20 13:53:41 +01:00
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final Thread workerThread;
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2009-01-20 12:04:27 +01:00
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final AtomicBoolean shutdown = new AtomicBoolean();
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2009-01-19 16:05:04 +01:00
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2009-01-20 12:04:27 +01:00
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private final long roundDuration;
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2009-01-19 16:05:04 +01:00
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final long tickDuration;
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final Set<HashedWheelTimeout>[] wheel;
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2009-01-20 08:57:45 +01:00
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final ReusableIterator<HashedWheelTimeout>[] iterators;
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2009-01-19 16:05:04 +01:00
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final int mask;
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final ReadWriteLock lock = new ReentrantReadWriteLock();
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volatile int wheelCursor;
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2009-01-20 13:17:56 +01:00
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public HashedWheelTimer() {
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this(Executors.defaultThreadFactory());
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}
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public HashedWheelTimer(
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long tickDuration, TimeUnit unit, int ticksPerWheel) {
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this(Executors.defaultThreadFactory(), tickDuration, unit, ticksPerWheel);
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}
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2009-01-20 13:18:50 +01:00
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public HashedWheelTimer(ThreadFactory threadFactory) {
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2009-01-20 12:04:27 +01:00
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this(threadFactory, 100, TimeUnit.MILLISECONDS, 512); // about 50 sec
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2009-01-19 16:05:04 +01:00
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}
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public HashedWheelTimer(
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2009-01-20 12:04:27 +01:00
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ThreadFactory threadFactory,
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2009-01-19 16:05:04 +01:00
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long tickDuration, TimeUnit unit, int ticksPerWheel) {
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2009-01-20 12:04:27 +01:00
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if (threadFactory == null) {
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throw new NullPointerException("threadFactory");
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2009-01-19 16:05:04 +01:00
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}
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if (unit == null) {
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throw new NullPointerException("unit");
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}
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if (tickDuration <= 0) {
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throw new IllegalArgumentException(
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"tickDuration must be greater than 0: " + tickDuration);
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}
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2009-01-20 13:17:56 +01:00
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if (ticksPerWheel <= 0) {
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throw new IllegalArgumentException(
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2009-01-20 13:32:20 +01:00
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"ticksPerWheel must be greater than 0: " + ticksPerWheel);
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2009-01-20 13:17:56 +01:00
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}
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2009-01-19 16:05:04 +01:00
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// Normalize ticksPerWheel to power of two and initialize the wheel.
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wheel = createWheel(ticksPerWheel);
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2009-01-20 08:57:45 +01:00
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iterators = createIterators(wheel);
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2009-01-19 16:05:04 +01:00
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mask = wheel.length - 1;
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2009-02-09 12:04:28 +01:00
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// Convert tickDuration to milliseconds.
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2009-02-09 11:58:30 +01:00
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this.tickDuration = tickDuration = unit.toMillis(tickDuration);
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2009-01-19 16:05:04 +01:00
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// Prevent overflow.
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if (tickDuration == Long.MAX_VALUE ||
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tickDuration >= Long.MAX_VALUE / wheel.length) {
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throw new IllegalArgumentException(
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"tickDuration is too long: " +
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tickDuration + ' ' + unit);
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}
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2009-01-20 08:57:45 +01:00
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roundDuration = tickDuration * wheel.length;
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2009-01-20 12:04:27 +01:00
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2009-01-20 12:35:04 +01:00
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workerThread = threadFactory.newThread(new ThreadRenamingRunnable(
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worker, "Hashed wheel timer #" + id.incrementAndGet()));
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2009-01-19 16:05:04 +01:00
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}
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@SuppressWarnings("unchecked")
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private static Set<HashedWheelTimeout>[] createWheel(int ticksPerWheel) {
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if (ticksPerWheel <= 0) {
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throw new IllegalArgumentException(
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"ticksPerWheel must be greater than 0: " + ticksPerWheel);
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}
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if (ticksPerWheel > 1073741824) {
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throw new IllegalArgumentException(
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"ticksPerWheel may not be greater than 2^30: " + ticksPerWheel);
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}
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ticksPerWheel = normalizeTicksPerWheel(ticksPerWheel);
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2009-01-20 08:57:45 +01:00
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Set<HashedWheelTimeout>[] wheel = new Set[ticksPerWheel];
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for (int i = 0; i < wheel.length; i ++) {
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2009-01-20 12:04:27 +01:00
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wheel[i] = new MapBackedSet<HashedWheelTimeout>(
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new ConcurrentIdentityHashMap<HashedWheelTimeout, Boolean>(16, 0.95f, 4));
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2009-01-19 16:05:04 +01:00
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}
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2009-01-20 08:57:45 +01:00
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return wheel;
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}
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@SuppressWarnings("unchecked")
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private static ReusableIterator<HashedWheelTimeout>[] createIterators(Set<HashedWheelTimeout>[] wheel) {
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ReusableIterator<HashedWheelTimeout>[] iterators = new ReusableIterator[wheel.length];
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for (int i = 0; i < wheel.length; i ++) {
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iterators[i] = (ReusableIterator<HashedWheelTimeout>) wheel[i].iterator();
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}
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return iterators;
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2009-01-19 16:05:04 +01:00
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}
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private static int normalizeTicksPerWheel(int ticksPerWheel) {
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int normalizedTicksPerWheel = 1;
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while (normalizedTicksPerWheel < ticksPerWheel) {
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normalizedTicksPerWheel <<= 1;
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}
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return normalizedTicksPerWheel;
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}
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2009-01-20 12:04:27 +01:00
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public void start() {
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workerThread.start();
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}
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2009-01-20 13:14:29 +01:00
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public Set<Timeout> stop() {
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2009-01-20 12:04:27 +01:00
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if (!shutdown.compareAndSet(false, true)) {
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2009-01-20 13:14:29 +01:00
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return Collections.emptySet();
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2009-01-20 12:04:27 +01:00
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}
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2009-01-20 13:14:29 +01:00
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2009-01-20 12:04:27 +01:00
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while (workerThread.isAlive()) {
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workerThread.interrupt();
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try {
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workerThread.join(100);
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} catch (InterruptedException e) {
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// Ignore
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}
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}
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2009-01-20 13:14:29 +01:00
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Set<Timeout> unprocessedTimeouts = new HashSet<Timeout>();
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for (Set<HashedWheelTimeout> bucket: wheel) {
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unprocessedTimeouts.addAll(bucket);
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bucket.clear();
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}
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return Collections.unmodifiableSet(unprocessedTimeouts);
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2009-01-19 16:05:04 +01:00
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}
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2009-02-02 04:42:05 +01:00
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public Timeout newTimeout(TimerTask task, long delay, TimeUnit unit) {
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2009-02-09 11:58:30 +01:00
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final long currentTime = System.currentTimeMillis();
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2009-02-02 04:42:05 +01:00
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2009-01-20 05:29:58 +01:00
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if (task == null) {
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throw new NullPointerException("task");
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}
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if (unit == null) {
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throw new NullPointerException("unit");
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}
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2009-02-09 11:58:30 +01:00
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delay = unit.toMillis(delay);
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2009-02-08 07:57:40 +01:00
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if (delay < tickDuration) {
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delay = tickDuration;
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}
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2009-01-19 16:05:04 +01:00
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2009-01-20 12:04:27 +01:00
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if (!workerThread.isAlive()) {
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start();
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}
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2009-02-02 04:42:05 +01:00
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// Prepare the required parameters to create the timeout object.
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2009-01-19 16:05:04 +01:00
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HashedWheelTimeout timeout;
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2009-02-02 04:42:05 +01:00
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final long lastRoundDelay = delay % roundDuration;
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final long lastTickDelay = delay % tickDuration;
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final long relativeIndex =
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lastRoundDelay / tickDuration + (lastTickDelay != 0? 1 : 0);
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final long deadline = currentTime + delay;
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final long remainingRounds =
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delay / roundDuration - (delay % roundDuration == 0? 1 : 0);
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// Add the timeout to the wheel.
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2009-01-19 16:05:04 +01:00
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lock.readLock().lock();
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try {
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2009-02-02 04:42:05 +01:00
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timeout =
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new HashedWheelTimeout(
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task, deadline,
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(int) (wheelCursor + relativeIndex & mask),
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remainingRounds);
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2009-01-19 16:05:04 +01:00
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2009-02-02 04:42:05 +01:00
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wheel[timeout.stopIndex].add(timeout);
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2009-01-19 16:05:04 +01:00
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} finally {
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lock.readLock().unlock();
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}
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return timeout;
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}
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private final class Worker implements Runnable {
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2009-01-20 10:03:31 +01:00
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private long startTime;
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2009-01-19 16:05:04 +01:00
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private long tick;
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Worker() {
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super();
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}
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2009-01-20 12:07:30 +01:00
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public void run() {
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2009-01-19 16:05:04 +01:00
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List<HashedWheelTimeout> expiredTimeouts =
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new ArrayList<HashedWheelTimeout>();
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2009-02-09 11:58:30 +01:00
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startTime = System.currentTimeMillis();
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2009-01-20 12:04:27 +01:00
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tick = 1;
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2009-01-19 16:05:04 +01:00
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2009-01-20 12:04:27 +01:00
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while (!shutdown.get()) {
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waitForNextTick();
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fetchExpiredTimeouts(expiredTimeouts);
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notifyExpiredTimeouts(expiredTimeouts);
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2009-01-20 10:03:31 +01:00
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}
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2009-01-19 16:05:04 +01:00
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}
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2009-01-20 12:04:27 +01:00
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private void fetchExpiredTimeouts(
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2009-01-19 16:05:04 +01:00
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List<HashedWheelTimeout> expiredTimeouts) {
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// Find the expired timeouts and decrease the round counter
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// if necessary. Note that we don't send the notification
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// immediately to make sure the listeners are called without
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// an exclusive lock.
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lock.writeLock().lock();
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try {
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2009-01-20 08:57:45 +01:00
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int oldBucketHead = wheelCursor;
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int newBucketHead = oldBucketHead + 1 & mask;
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2009-01-19 16:05:04 +01:00
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wheelCursor = newBucketHead;
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2009-01-20 08:57:45 +01:00
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ReusableIterator<HashedWheelTimeout> i = iterators[oldBucketHead];
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fetchExpiredTimeouts(expiredTimeouts, i);
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} finally {
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lock.writeLock().unlock();
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}
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}
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private void fetchExpiredTimeouts(
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List<HashedWheelTimeout> expiredTimeouts,
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2009-01-20 09:38:07 +01:00
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ReusableIterator<HashedWheelTimeout> i) {
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2009-01-20 08:57:45 +01:00
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2009-02-09 11:58:30 +01:00
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long currentTime = System.currentTimeMillis();
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2009-01-20 10:03:31 +01:00
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i.rewind();
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while (i.hasNext()) {
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HashedWheelTimeout timeout = i.next();
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synchronized (timeout) {
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if (timeout.remainingRounds <= 0) {
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if (timeout.deadline <= currentTime) {
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i.remove();
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expiredTimeouts.add(timeout);
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2009-01-19 16:05:04 +01:00
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} else {
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2009-01-20 10:03:31 +01:00
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// A rare case where a timeout is put for the next
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// round: just wait for the next round.
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2009-01-19 16:05:04 +01:00
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}
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2009-01-20 10:03:31 +01:00
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} else {
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timeout.remainingRounds --;
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2009-01-19 16:05:04 +01:00
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}
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2009-01-20 10:03:31 +01:00
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}
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2009-01-19 16:05:04 +01:00
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}
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}
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private void notifyExpiredTimeouts(
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List<HashedWheelTimeout> expiredTimeouts) {
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// Notify the expired timeouts.
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for (int i = expiredTimeouts.size() - 1; i >= 0; i --) {
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expiredTimeouts.get(i).expire();
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}
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// Clean up the temporary list.
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expiredTimeouts.clear();
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}
|
|
|
|
|
2009-01-20 12:04:27 +01:00
|
|
|
private void waitForNextTick() {
|
2009-01-19 16:05:04 +01:00
|
|
|
for (;;) {
|
2009-02-09 11:58:30 +01:00
|
|
|
final long currentTime = System.currentTimeMillis();
|
2009-01-19 16:05:04 +01:00
|
|
|
final long sleepTime = tickDuration * tick - (currentTime - startTime);
|
|
|
|
|
|
|
|
if (sleepTime <= 0) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
try {
|
2009-02-09 12:29:17 +01:00
|
|
|
Thread.sleep(sleepTime);
|
2009-01-19 16:05:04 +01:00
|
|
|
} catch (InterruptedException e) {
|
2009-01-20 12:04:27 +01:00
|
|
|
if (shutdown.get()) {
|
|
|
|
return;
|
2009-01-20 08:57:45 +01:00
|
|
|
}
|
2009-01-19 16:05:04 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Reset the tick if overflow is expected.
|
|
|
|
if (tickDuration * tick > Long.MAX_VALUE - tickDuration) {
|
2009-02-09 11:58:30 +01:00
|
|
|
startTime = System.currentTimeMillis();
|
2009-01-19 16:05:04 +01:00
|
|
|
tick = 1;
|
|
|
|
} else {
|
|
|
|
// Increase the tick if overflow is not likely to happen.
|
|
|
|
tick ++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
private final class HashedWheelTimeout implements Timeout {
|
|
|
|
|
2009-01-20 05:29:58 +01:00
|
|
|
private final TimerTask task;
|
2009-02-02 04:42:05 +01:00
|
|
|
final int stopIndex;
|
|
|
|
final long deadline;
|
|
|
|
volatile long remainingRounds;
|
2009-01-20 05:29:58 +01:00
|
|
|
private volatile boolean cancelled;
|
2009-01-19 16:05:04 +01:00
|
|
|
|
2009-02-02 04:42:05 +01:00
|
|
|
HashedWheelTimeout(
|
|
|
|
TimerTask task, long deadline, int stopIndex, long remainingRounds) {
|
2009-01-20 05:29:58 +01:00
|
|
|
this.task = task;
|
2009-02-02 04:42:05 +01:00
|
|
|
this.deadline = deadline;
|
|
|
|
this.stopIndex = stopIndex;
|
|
|
|
this.remainingRounds = remainingRounds;
|
2009-01-19 16:05:04 +01:00
|
|
|
}
|
|
|
|
|
2009-01-20 05:29:58 +01:00
|
|
|
public TimerTask getTask() {
|
|
|
|
return task;
|
|
|
|
}
|
|
|
|
|
|
|
|
public void cancel() {
|
2009-02-05 07:55:14 +01:00
|
|
|
if (isExpired()) {
|
2009-01-19 16:05:04 +01:00
|
|
|
return;
|
|
|
|
}
|
2009-01-20 05:29:58 +01:00
|
|
|
|
2009-01-20 13:43:28 +01:00
|
|
|
cancelled = true;
|
|
|
|
|
|
|
|
// Might be called more than once, but doesn't matter.
|
2009-02-02 04:42:05 +01:00
|
|
|
wheel[stopIndex].remove(this);
|
2009-01-19 16:05:04 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
public boolean isCancelled() {
|
2009-01-20 05:29:58 +01:00
|
|
|
return cancelled;
|
2009-01-19 16:05:04 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
public boolean isExpired() {
|
2009-02-09 11:58:30 +01:00
|
|
|
return cancelled || System.currentTimeMillis() > deadline;
|
2009-01-19 16:05:04 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
public void expire() {
|
2009-01-20 05:29:58 +01:00
|
|
|
if (cancelled) {
|
|
|
|
return;
|
|
|
|
}
|
2009-01-19 16:05:04 +01:00
|
|
|
|
2009-01-20 05:29:58 +01:00
|
|
|
try {
|
|
|
|
task.run(this);
|
|
|
|
} catch (Throwable t) {
|
2009-01-20 05:39:11 +01:00
|
|
|
logger.warn(
|
|
|
|
"An exception was thrown by " +
|
|
|
|
TimerTask.class.getSimpleName() + ".", t);
|
2009-01-20 05:29:58 +01:00
|
|
|
}
|
2009-01-19 16:05:04 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public String toString() {
|
2009-02-09 11:58:30 +01:00
|
|
|
long currentTime = System.currentTimeMillis();
|
2009-01-20 05:35:33 +01:00
|
|
|
long remaining = deadline - currentTime;
|
2009-01-19 16:05:04 +01:00
|
|
|
|
2009-01-20 05:35:33 +01:00
|
|
|
StringBuilder buf = new StringBuilder(192);
|
|
|
|
buf.append(getClass().getSimpleName());
|
|
|
|
buf.append('(');
|
2009-01-19 16:05:04 +01:00
|
|
|
|
|
|
|
buf.append("deadline: ");
|
|
|
|
if (remaining > 0) {
|
2009-02-09 12:29:17 +01:00
|
|
|
buf.append(remaining);
|
2009-01-20 05:29:58 +01:00
|
|
|
buf.append(" ms later, ");
|
2009-01-19 16:05:04 +01:00
|
|
|
} else if (remaining < 0) {
|
2009-02-09 12:29:17 +01:00
|
|
|
buf.append(-remaining);
|
2009-01-20 05:29:58 +01:00
|
|
|
buf.append(" ms ago, ");
|
2009-01-19 16:05:04 +01:00
|
|
|
} else {
|
2009-01-20 05:29:58 +01:00
|
|
|
buf.append("now, ");
|
|
|
|
}
|
|
|
|
|
|
|
|
if (isCancelled()) {
|
|
|
|
buf.append (", cancelled");
|
2009-01-19 16:05:04 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
return buf.append(')').toString();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|