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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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 * as provided by Sun in the GPL Version 2 section of the License file that
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package com.sun.enterprise.management;

import java.io.IOException;

import java.util.Set;
import java.util.HashSet;
import java.util.Collections;

import javax.management.ObjectName;
import javax.management.MBeanServerConnection;
import javax.management.InstanceNotFoundException;

import com.sun.appserv.management.base.AMX;
import com.sun.appserv.management.base.Util;

import com.sun.appserv.management.util.jmx.MBeanRegistrationListener;
import com.sun.appserv.management.util.jmx.JMXUtil;
	
/**
	A NotificationListener which tracks registration of MBeans.
 */
public final class RegistrationListener extends MBeanRegistrationListener
{
	private final MBeanServerConnection		mConn;
	
	private final Set<ObjectName>     mRegistered;
	private final Set<ObjectName>     mUnregistered;
	private final Set<ObjectName>     mCurrentlyRegistered;
	
		private
	RegistrationListener(
        final String name,
        final MBeanServerConnection conn )
	    throws InstanceNotFoundException, java.io.IOException
	{
	    super( "RegistrationListener", conn, null );
	    
	    mConn   = conn;
	    
	    mRegistered     = new HashSet<ObjectName>();
	    mUnregistered   = new HashSet<ObjectName>();
	    mCurrentlyRegistered    = new HashSet<ObjectName>();
	    
	    queryAllAMX();
	}
    
        public static RegistrationListener
    createInstance(
        final String name,
        final MBeanServerConnection conn )
        throws InstanceNotFoundException, java.io.IOException
    {
        final RegistrationListener listener = new RegistrationListener(name, conn);
        
        JMXUtil.listenToMBeanServerDelegate( conn, listener, null, null );
        
        return listener;
    }
        
	
	    private void
	queryAllAMX()
	{
	    try
	    {
	    final ObjectName pat    = Util.newObjectNamePattern( AMX.JMX_DOMAIN, "*" );
	    final Set<ObjectName>  all = JMXUtil.queryNames( mConn, pat, null );
	    
	    mCurrentlyRegistered.addAll( all );
	    }
	    catch( IOException e )
	    {
	    }
	}

	    public void
	notifsLost()
	{
	    queryAllAMX();
	}
	
	    private boolean
	isAMX( final ObjectName objectName )
	{
	    return objectName.getDomain().equals( AMX.JMX_DOMAIN );
	}
	
        protected synchronized void
    mbeanRegistered( final ObjectName objectName )
    {
        if ( isAMX( objectName ) )
        {
            mRegistered.add( objectName );
            mCurrentlyRegistered.add( objectName );
        }
    }
    
        protected synchronized void
    mbeanUnregistered( final ObjectName objectName )
    {
        if ( isAMX( objectName ) )
        {
            mUnregistered.add( objectName );
            mCurrentlyRegistered.remove( objectName );
        }
    }
    
        public Set<ObjectName>
    getRegistered()
    {
        return Collections.unmodifiableSet( mRegistered );
    }
    
        public Set<ObjectName>
    getUnregistered()
    {
        return Collections.unmodifiableSet( mUnregistered );
    }
    
        public synchronized Set<ObjectName>
    getCurrentlyRegistered()
    {
        final Set<ObjectName> all   = new HashSet<ObjectName>( mCurrentlyRegistered );
        
        return all;
    }
	
}