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package com.sun.enterprise.admin.alert;
import java.util.logging.ErrorManager;
import javax.management.NotificationListener;
import javax.management.MBeanServerNotification;
import javax.management.Notification;
import javax.management.MBeanServer;
import com.sun.enterprise.admin.server.core.AdminService;
import java.util.List;
import java.util.Iterator;
/**
* Class MBeanRegistrationEventListener listens to MBeanRegistered event.
* The main purpose of this class is to introspect the 'name' element in
* objectName of the MBean (or Monitor) registered and check to see if it
* matches with any of the names listed for alert-subscription. If it matches
* then the listener will be subscribed with the MBean.
*
* @AUTHOR: Hemanth Puttaswamy
*/
public class MBeanRegistrationEventListener implements NotificationListener {
// All the alert subscriptions from domain.xml
private List alertSubscriptions;
private MBeanServer mbeanServer;
private static final String NAME_PROPERTY_KEY = "name";
/**
* Constructor which accepts a list of AlertSubscriptions based on
* domain.xml entries.
*/
public MBeanRegistrationEventListener( List alertSubscriptions ) {
this.alertSubscriptions = alertSubscriptions;
mbeanServer =
AdminService.getAdminService().getAdminContext().getMBeanServer();
}
/**
* If the event type is REGISTRATION_NOTIFICATION and if the 'name' element
* in registered MBean's ObjectName matches one of names in the alert
* subscriptions then we will add the Notification Listener and the Filter
* to the MBean.
*/
public void handleNotification( Notification notification,
Object handBack )
{
if( !notification.getType().equals(
MBeanServerNotification.REGISTRATION_NOTIFICATION ) )
{
// We are only interested in Registration event
return;
}
try {
MBeanServerNotification mbeanServerNotification =
(MBeanServerNotification) notification;
String registeredMbeanName =
mbeanServerNotification.getMBeanName().getKeyProperty(
NAME_PROPERTY_KEY );
// Registered ObjectName doesn't have the 'name' key value. So,
// no action needs to be taken.
if( registeredMbeanName == null ) return;
Iterator iterator = alertSubscriptions.iterator( );
while ( iterator.hasNext( ) ) {
AlertSubscriptionInfo subscription =
(AlertSubscriptionInfo)iterator.next();
if( matches( subscription.getMonitorNames(),
registeredMbeanName ))
{
mbeanServer.addNotificationListener(
mbeanServerNotification.getMBeanName(),
subscription.getNotificationListener(),
subscription.getNotificationFilter(), null );
}
}
} catch( Exception e ) {
new ErrorManager().error( "Error In " +
" MBeanServerRegistrationEventListener ", e,
ErrorManager.GENERIC_FAILURE );
}
}
/**
* A simple utility method to check to see if the registeredMBeanName
* matches with one of the monitorNames for alert subscription.
*/
private boolean matches( List monitorNames, String registeredMBeanName ) {
Iterator iterator = monitorNames.iterator( );
while( iterator.hasNext( ) ) {
if( registeredMBeanName.equals( (String) iterator.next() ) ) {
return true;
}
}
return false;
}
}