/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.messaging.core.plugin.postoffice.cluster;
import java.util.Timer;
import java.util.TimerTask;
import org.jboss.logging.Logger;
import org.jboss.messaging.core.plugin.contract.MessagingComponent;
/**
* A StatsSender
*
* @author <a href="mailto:tim.fox@jboss.com">Tim Fox</a>
* @version <tt>$Revision: 1951 $</tt>
*
* $Id: StatsSender.java 1951 2007-01-10 20:03:51Z timfox $
*
*/
public class StatsSender implements MessagingComponent
{
private static final Logger log = Logger.getLogger(DefaultClusteredPostOffice.class);
private PostOfficeInternal office;
private boolean started;
private Timer timer;
private long period;
private SendStatsTimerTask task;
StatsSender(PostOfficeInternal office, long period)
{
this.office = office;
this.period = period;
}
public synchronized void start()
{
if (started)
{
return;
}
//Needs to be daemon
timer = new Timer(true);
//Add a random delay to prevent all timers starting at once
long delay = (long)(period * Math.random());
task = new SendStatsTimerTask();
timer.schedule(task, delay, period);
started = true;
}
public synchronized void stop()
{
if (!started)
{
return;
}
//Wait for timer task to stop
task.stop();
timer.cancel();
timer = null;
started = false;
}
class SendStatsTimerTask extends TimerTask
{
public synchronized void run()
{
try
{
office.sendQueueStats();
}
catch (Exception e)
{
log.error("Failed to send statistics", e);
}
}
synchronized void stop()
{
cancel();
}
}
}