* Beside this allow to set a ThreadNameDeterminer per BossPool and WorkerPool. This allows to have different determiner instances in the same JVM. This fixes #771. * With the possiblity to share BossPools it is even easier to limit the Thread counts even if you need to create many ChannelFactory instances. So this gives a lot of flexibility.
136 lines
5.0 KiB
Java
136 lines
5.0 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the 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.util;
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import org.jboss.netty.logging.InternalLogger;
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import org.jboss.netty.logging.InternalLoggerFactory;
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/**
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* A {@link Runnable} that changes the current thread name and reverts it back
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* when its execution ends. To change the default thread names set by Netty,
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* use {@link #setThreadNameDeterminer(ThreadNameDeterminer)}.
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*
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* @apiviz.landmark
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* @apiviz.has org.jboss.netty.util.ThreadNameDeterminer oneway - -
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*/
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public class ThreadRenamingRunnable implements Runnable {
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private static final InternalLogger logger =
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InternalLoggerFactory.getInstance(ThreadRenamingRunnable.class);
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private static volatile ThreadNameDeterminer threadNameDeterminer =
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ThreadNameDeterminer.PROPOSED;
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private final ThreadNameDeterminer determiner;
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/**
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* Returns the {@link ThreadNameDeterminer} which overrides the proposed
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* new thread name.
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*/
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public static ThreadNameDeterminer getThreadNameDeterminer() {
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return threadNameDeterminer;
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}
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/**
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* Sets the {@link ThreadNameDeterminer} which overrides the proposed new
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* thread name. Please note that the specified {@link ThreadNameDeterminer}
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* affects only new {@link ThreadRenamingRunnable}s; the existing instances
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* are not affected at all. Therefore, you should make sure to call this
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* method at the earliest possible point (i.e. before any Netty worker
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* thread starts) for consistent thread naming. Otherwise, you might see
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* the default thread names and the new names appear at the same time in
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* the full thread dump.
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*/
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public static void setThreadNameDeterminer(ThreadNameDeterminer threadNameDeterminer) {
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if (threadNameDeterminer == null) {
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throw new NullPointerException("threadNameDeterminer");
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}
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ThreadRenamingRunnable.threadNameDeterminer = threadNameDeterminer;
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}
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private final Runnable runnable;
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private final String proposedThreadName;
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/**
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* Creates a new instance which wraps the specified {@code runnable}
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* and changes the thread name to the specified thread name when the
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* specified {@code runnable} is running.
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*/
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public ThreadRenamingRunnable(Runnable runnable, String proposedThreadName, ThreadNameDeterminer determiner) {
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if (runnable == null) {
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throw new NullPointerException("runnable");
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}
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if (proposedThreadName == null) {
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throw new NullPointerException("proposedThreadName");
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}
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this.runnable = runnable;
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this.determiner = determiner;
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this.proposedThreadName = proposedThreadName;
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}
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public ThreadRenamingRunnable(Runnable runnable, String proposedThreadName) {
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this(runnable, proposedThreadName, null);
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}
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public void run() {
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final Thread currentThread = Thread.currentThread();
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final String oldThreadName = currentThread.getName();
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final String newThreadName = getNewThreadName(oldThreadName);
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// Change the thread name before starting the actual runnable.
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boolean renamed = false;
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if (!oldThreadName.equals(newThreadName)) {
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try {
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currentThread.setName(newThreadName);
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renamed = true;
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} catch (SecurityException e) {
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logger.debug(
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"Failed to rename a thread " +
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"due to security restriction.", e);
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}
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}
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// Run the actual runnable and revert the name back when it ends.
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try {
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runnable.run();
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} finally {
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if (renamed) {
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// Revert the name back if the current thread was renamed.
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// We do not check the exception here because we know it works.
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currentThread.setName(oldThreadName);
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}
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}
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}
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private String getNewThreadName(String currentThreadName) {
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String newThreadName = null;
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try {
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ThreadNameDeterminer nameDeterminer = determiner;
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if (nameDeterminer == null) {
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nameDeterminer = getThreadNameDeterminer();
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}
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newThreadName =
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nameDeterminer.determineThreadName(
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currentThreadName, proposedThreadName);
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} catch (Throwable t) {
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logger.warn("Failed to determine the thread name", t);
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}
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return newThreadName == null? currentThreadName : newThreadName;
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}
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}
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