/*
* 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.monitor.services;
import javax.management.Notification;
import javax.management.ObjectName;
import org.jboss.logging.Logger;
import org.jboss.system.ListenerServiceMBeanSupport;
import EDU.oswego.cs.dl.util.concurrent.SynchronizedLong;
/**
* A simple JMX notification listener that outputs notifications as log.INFO
* messages, and demonstrates the usefulness of ListenerServiceMBeanSupport.
*
* @jmx:mbean
* extends="org.jboss.system.ListenerServiceMBean"
*
* @author <a href="mailto:dimitris@jboss.org">Dimitris Andreadis</a>
* @version $Revision: 91804 $
*/
public class NotificationListener extends ListenerServiceMBeanSupport
implements NotificationListenerMBean
{
// Private Data --------------------------------------------------
/** Number of processed JMX notifications */
private SynchronizedLong notificationCount;
/** Dynamic subscriptions flag */
private boolean dynamicSubscriptions;
/** Listener MBean */
private ObjectName notificationListener;
private volatile Logger.Level level = Logger.Level.INFO;
// Protected Data ------------------------------------------------
// Constructors --------------------------------------------------
/**
* CTOR
*/
public NotificationListener()
{
notificationCount = new SynchronizedLong(0);
dynamicSubscriptions = true;
notificationListener = null;
}
// NotificationListenerMBean Implementation -----------------------
/**
* Number of notifications received.
*
* @jmx:managed-attribute
*/
public long getNotificationCount()
{
return this.notificationCount.get();
}
/**
* Enables/disables dynamic subscriptions
*
* @jmx:managed-attribute
*/
public void setDynamicSubscriptions(boolean dynamicSubscriptions)
{
this.dynamicSubscriptions = dynamicSubscriptions;
}
/**
* Gets the dynamic subscriptions status
*
* @jmx:managed-attribute
*/
public boolean getDynamicSubscriptions()
{
return this.dynamicSubscriptions;
}
/**
* Sets listener of notifications
*
* @jmx:managed-attribute
*/
public void setNotificationListener(ObjectName notificationListener)
{
this.notificationListener = notificationListener;
}
/**
* Gets listener of notifications
*
* @jmx:managed-attribute
*/
public ObjectName getNotificationListener()
{
return this.notificationListener;
}
/**
* Sets the dynamic log level
*
* @jmx:managed-attribute
*/
public void setLogLevel(String logLevel)
{
level = Logger.Level.valueOf(logLevel);
}
/**
* Gets the dynamic log level
*
* @jmx:managed-attribute
*/
public String getLogLevel()
{
return level.name();
}
// Lifecycle control (ServiceMBeanSupport) -----------------------
/**
* Start
*/
public void startService() throws Exception
{
if (this.notificationListener == null)
{
super.subscribe(this.dynamicSubscriptions); // listener is me!
}
else
{
super.subscribe(this.dynamicSubscriptions, this.notificationListener);
}
}
/**
* Stop
*/
public void stopService() throws Exception
{
// unsubscribe for notifications
super.unsubscribe();
}
/**
* Overriden to add handling!
*/
public void handleNotification2(Notification notification, Object handback)
{
log.log(level, "Got notification (#" + Long.toString(this.notificationCount.increment())
+ "): " + notification + ", handback: " + handback);
}
}