/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file 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.ejb.txtimer;
// $Id: FixedDelayRetryPolicy.java 81030 2008-11-14 12:59:42Z dimitris@jboss.org $
import org.jboss.logging.Logger;
import org.jboss.system.ServiceMBeanSupport;
import javax.ejb.Timer;
/**
* This service implements a RetryPolicy that retries
* the call to ejbTimeout after a fixed delay.
*
* @author Thomas.Diesler@jboss.org
* @version $Revision: 81030 $
* @since 07-Apr-2004
*/
public class FixedDelayRetryPolicy extends ServiceMBeanSupport implements FixedDelayRetryPolicyMBean
{
// logging support
private static Logger log = Logger.getLogger(FixedDelayRetryPolicy.class);
// the delay before retry
private long delay = 100;
/**
* Get the delay for retry
*
* @return delay in ms
* @jmx.managed-attribute
*/
public long getDelay()
{
return this.delay;
}
/**
* Set the delay for retry
*
* @param delay in ms
* @jmx.managed-attribute
*/
public void setDelay(long delay)
{
this.delay = delay;
}
/**
* Invokes the ejbTimeout method on the TimedObject with the given id.
*
* @param invoker The invoker for the TimedObject
* @param timer the Timer that is passed to ejbTimeout
* @jmx.managed-operation
*/
public void retryTimeout(TimedObjectInvoker invoker, Timer timer)
{
// check if the delay is appropriate
if (timer instanceof TimerImpl)
{
TimerImpl txTimer = (TimerImpl)timer;
long periode = txTimer.getPeriode();
if (0 < periode && periode / 2 < delay)
log.warn("A delay of " + delay + " ms might not be appropriate for a timer periode of " + periode + " ms");
}
new RetryThread(invoker, timer).start();
}
/**
* The thread that does the actual invocation,
* after a short delay.
*/
private class RetryThread extends Thread
{
private TimedObjectInvoker invoker;
private Timer timer;
public RetryThread(TimedObjectInvoker invoker, Timer timer)
{
this.invoker = invoker;
this.timer = timer;
}
public void run()
{
try
{
Thread.sleep(delay);
log.debug("Retry ejbTimeout: " + timer);
invoker.callTimeout(timer);
}
catch (Exception ignore)
{
ignore.printStackTrace();
}
}
}
}