/**
* Copyright (C) 2012 LinkedIn Inc <opensource@linkedin.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.linkedin.helix.monitoring.mbeans;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanServerConnection;
import javax.management.MBeanServerDelegate;
import javax.management.MBeanServerNotification;
import javax.management.MalformedObjectNameException;
import javax.management.Notification;
import javax.management.NotificationListener;
import javax.management.relation.MBeanServerNotificationFilter;
import org.apache.log4j.Logger;
/*
* TODO: this class should be in espresso common, as the only usage of it is
* to create ingraph adaptors
* **/
public abstract class ClusterMBeanObserver implements NotificationListener
{
protected final String _domain;
protected MBeanServerConnection _server;
private static final Logger _logger = Logger.getLogger(ClusterMBeanObserver.class);
public ClusterMBeanObserver(String domain)
throws InstanceNotFoundException, IOException, MalformedObjectNameException, NullPointerException
{
// Get a reference to the target MBeanServer
_domain = domain;
_server = ManagementFactory.getPlatformMBeanServer();
MBeanServerNotificationFilter filter = new MBeanServerNotificationFilter();
filter.enableAllObjectNames();
_server.addNotificationListener(MBeanServerDelegate.DELEGATE_NAME, this, filter, null);
}
public void handleNotification(Notification notification, Object handback)
{
MBeanServerNotification mbs = (MBeanServerNotification) notification;
if(MBeanServerNotification.REGISTRATION_NOTIFICATION.equals(mbs.getType()))
{
if(mbs.getMBeanName().getDomain().equalsIgnoreCase(_domain))
{
_logger.info("MBean Registered, name :" + mbs.getMBeanName());
onMBeanRegistered(_server, mbs);
}
}
else if(MBeanServerNotification.UNREGISTRATION_NOTIFICATION.equals(mbs.getType()))
{
if(mbs.getMBeanName().getDomain().equalsIgnoreCase(_domain))
{
_logger.info("MBean Unregistered, name :" + mbs.getMBeanName());
onMBeanUnRegistered(_server, mbs);
}
}
}
public void disconnect()
{
MBeanServerNotificationFilter filter = new MBeanServerNotificationFilter();
try
{
_server.removeNotificationListener(MBeanServerDelegate.DELEGATE_NAME, this);
}
catch (Exception e)
{
_logger.error("", e);
}
}
public abstract void onMBeanRegistered(MBeanServerConnection server, MBeanServerNotification mbsNotification);
public abstract void onMBeanUnRegistered(MBeanServerConnection server, MBeanServerNotification mbsNotification);
}