/*
* Copyright (C) The MX4J Contributors.
* All rights reserved.
*
* This software is distributed under the terms of the MX4J License version 1.0.
* See the terms of the MX4J License in the documentation provided with this software.
*/
package javax.management;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.rmi.server.UID;
/**
* The MBean that broadcasts notifications about registration and unregistration of other MBeans.
* It is registered with ObjectName <code>JMImplementation:type=MBeanServerDelegate</code>.
* It also gives information about the JMX version and implementation.
*
* @version $Revision: 1.24 $
*/
public class MBeanServerDelegate implements MBeanServerDelegateMBean, NotificationEmitter
{
private static long mbeanServerCount;
// Only notifications of type MBeanServerNotification are emitted by this class, so the array must have length 1
private static final MBeanNotificationInfo[] notifications = new MBeanNotificationInfo[]{new MBeanNotificationInfo
(new String[]{MBeanServerNotification.REGISTRATION_NOTIFICATION, MBeanServerNotification.UNREGISTRATION_NOTIFICATION},
MBeanServerNotification.class.getName(), // as required by the spec
"Notifications emitted by the MBeanServerDelegate MBean upon registration or unregistration of MBeans")};
private String mbeanServerID;
private NotificationBroadcasterSupport broadcaster = new NotificationBroadcasterSupport();
/**
* Creates a new instance of the MBeanServerDelegate
*/
public MBeanServerDelegate()
{
}
public void addNotificationListener(NotificationListener listener, NotificationFilter filter, Object handback) throws IllegalArgumentException
{
broadcaster.addNotificationListener(listener, filter, handback);
}
public void removeNotificationListener(NotificationListener listener) throws ListenerNotFoundException
{
broadcaster.removeNotificationListener(listener);
}
public void removeNotificationListener(NotificationListener listener, NotificationFilter filter, Object handback)
throws ListenerNotFoundException
{
broadcaster.removeNotificationListener(listener, filter, handback);
}
public MBeanNotificationInfo[] getNotificationInfo()
{
return notifications;
}
/**
* @see NotificationBroadcasterSupport#sendNotification
*/
public void sendNotification(Notification notification)
{
broadcaster.sendNotification(notification);
}
public String getMBeanServerId()
{
// Evaluate lazily, since it may be an expensive operation
synchronized (this)
{
if (mbeanServerID == null) mbeanServerID = generateMBeanServerID();
}
return mbeanServerID;
}
public String getImplementationName()
{
return "MX4J";
}
public String getImplementationVendor()
{
return "The MX4J Team";
}
public String getImplementationVersion()
{
return "3.0.2";
}
public String getSpecificationName()
{
return "Java Management Extensions";
}
public String getSpecificationVendor()
{
return "Sun Microsystems";
}
public String getSpecificationVersion()
{
return "1.2 Maintenance Release";
}
private String getLocalHost()
{
try
{
return InetAddress.getLocalHost().getHostName();
}
catch (UnknownHostException ignored)
{
return "localhost";
}
}
private String generateMBeanServerID()
{
long count = 0;
synchronized (MBeanServerDelegate.class)
{
++mbeanServerCount;
count = mbeanServerCount;
}
UID uid = new UID();
return uid.toString() + ":" + getLocalHost() + ":" + count;
}
}