/*
* RHQ Management Platform
* Copyright (C) 2005-2008 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation, and/or the GNU Lesser
* General Public License, version 2.1, also as published by the Free
* Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License and the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* and the GNU Lesser General Public License along with this program;
* if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.rhq.core.pc.util;
import java.lang.Thread.UncaughtExceptionHandler;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* This thread factory just adds a {@link UncaughtExceptionHandler} to threads it creates so that there are logs of the
* exceptions that cause threads to die.
*
* <p>Use this class when providing a thread factory to threadpools.</p>
*
* <p>This factory's constructor can be told to create daemon or non-daemon threads.</p>
*
* @author Greg Hinkle
*/
public class LoggingThreadFactory implements ThreadFactory, Thread.UncaughtExceptionHandler {
private final Log log;
private final String poolName;
private final AtomicInteger threadNumber = new AtomicInteger(1);
private final ThreadGroup group;
private final boolean daemon;
/**
* Creates a factory that will produce either daemon or non-daemon threads. Be careful if you pass in <code>
* false</code> for the <code>daemon</code> parameter; if you do, make sure your thread pool and all its threads
* created by this factory are properly shutdown; otherwise you could prevent the VM from exiting properly.
*
* @param poolName the name of the thread pool that will be using this factory
* @param daemon if <code>true</code>, the factory will create daemon threads; <code>false</code> for non-daemon
* threads
*/
public LoggingThreadFactory(String poolName, boolean daemon) {
this.poolName = poolName;
this.log = LogFactory.getLog("org.rhq.threadpools." + poolName);
this.daemon = daemon;
SecurityManager s = System.getSecurityManager();
group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
}
/**
* @see java.util.concurrent.ThreadFactory#newThread(Runnable)
*/
public Thread newThread(Runnable r) {
Thread t = new Thread(group, r, poolName + "-" + threadNumber.getAndIncrement());
t.setDaemon(this.daemon);
if (t.getPriority() != Thread.NORM_PRIORITY) {
t.setPriority(Thread.NORM_PRIORITY);
}
t.setUncaughtExceptionHandler(this);
return t;
}
/**
* This simply logs the exception via this factory's logger.
*
* @see UncaughtExceptionHandler#uncaughtException(Thread, Throwable)
*/
public void uncaughtException(Thread t, Throwable e) {
log.error("Uncaught exception on scheduled thread [" + t.getName() + "]", e);
}
public String getPoolName() {
return poolName;
}
@Override
public String toString() {
return "LoggingThreadFactory[poolName=" + poolName + "]";
}
}