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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * 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_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package org.glassfish.admin.mejb;

import java.lang.management.ManagementFactory;
import java.net.InetAddress;
import java.net.UnknownHostException;
import javax.rmi.PortableRemoteObject;
import java.rmi.RemoteException;
import javax.management.InstanceNotFoundException;
import javax.management.ListenerNotFoundException;
import javax.management.MBeanServer;
import javax.management.NotificationFilter;
import javax.management.NotificationListener;
import javax.management.ObjectName;
import javax.management.j2ee.ListenerRegistration;
import javax.management.j2ee.ManagementHome;
import javax.management.j2ee.Management;
import javax.naming.Context;
import javax.naming.InitialContext;


/**
 */
public final class MEJBUtility {
    private final MBeanServer mServer;
    private final ListenerRegistry listenerRegistry;
    private Management  mMEJB;
    
    private static final MEJBUtility INSTANCE = new MEJBUtility();

    private MEJBUtility() {
        mServer = ManagementFactory.getPlatformMBeanServer();
        listenerRegistry = _getListenerRegistry();
    }

    public static MEJBUtility getInstance() {
        return INSTANCE;
    }


    public static final String MEJB_NAME_PROP = "mejb.name";
    public static final String MEJB_DEFAULT_NAME = "ejb/mgmt/MEJB";

    public synchronized Management getMEJB() throws RemoteException {
        if (mMEJB == null) {
            try {
                final Context ic = new InitialContext();
                final String ejbName = System.getProperty( MEJB_NAME_PROP, MEJB_DEFAULT_NAME);
                final Object objref = ic.lookup(ejbName);
                final ManagementHome home = (ManagementHome) PortableRemoteObject.narrow(objref, ManagementHome.class);
                mMEJB = (Management) home.create();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
        return mMEJB;
    }

    public MBeanServer getMBeanServer()
    {
        return mServer;
    }

    public ListenerRegistration getListenerRegistry()
    {
        return listenerRegistry;
    }

    private static ListenerRegistry _getListenerRegistry() {
        ListenerRegistry reg = null;
        try {
            reg = new ListenerRegistry( InetAddress.getLocalHost().getHostAddress());
        } catch ( final UnknownHostException e) {
            reg = new ListenerRegistry( MEJBUtility.class.getName() );
        }
        return reg;
    }
    

    public void addNotificationListener( final ObjectName name, NotificationListener listener, NotificationFilter filter, Object handback)
            throws InstanceNotFoundException, RemoteException {

        if ( ! mServer.isRegistered(name) )
        {
            System.out.println( "addNotificationListener: NOT REGISTERED: " + name );
        }
        else
        {
            System.out.println( "addNotificationListener: REGISTERED: " + name );
        }
        mServer.addNotificationListener(name, listener, filter, handback);
    }

    public void removeNotificationListener( final ObjectName name, NotificationListener listener)
            throws InstanceNotFoundException, ListenerNotFoundException, RemoteException {
        mServer.removeNotificationListener(name, listener);
    }
}