/*
 * Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.server.admin;

import java.lang.reflect.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.*;
import javax.management.MBeanServerConnection;

import com.caucho.config.*;
import com.caucho.loader.EnvironmentLocal;
import com.caucho.util.*;

/**
 * Proxy implementation for Hessian clients.  Applications will generally
 * use HessianProxyFactory to create proxy clients.
 */
public class RemoteMBeanConnectionFactory {
  private static final L10N L = new L10N(RemoteMBeanConnectionFactory.class);
  private static final Logger log
    = Logger.getLogger(RemoteMBeanConnectionFactory.class.getName());
  
  private static Constructor<?> _constructor;
  
  private static EnvironmentLocal<RemoteMBeanConnectionFactory> _localFactory
    = new EnvironmentLocal<RemoteMBeanConnectionFactory>();
  
  private ConcurrentHashMap<String,MBeanServerConnection> _connMap
    = new ConcurrentHashMap<String,MBeanServerConnection>();
  
  public static MBeanServerConnection create(String serverId)
  {
    return createFactory().createImpl(serverId);
  }
  
  private static RemoteMBeanConnectionFactory createFactory()
  {
    RemoteMBeanConnectionFactory factory = _localFactory.getLevel();
    
    if (factory == null) {
      factory = new RemoteMBeanConnectionFactory();
      
      _localFactory.set(factory);
    }
    
    return factory;
  }
  
  private MBeanServerConnection createImpl(String serverId)
  {
    MBeanServerConnection conn = _connMap.get(serverId);
    
    if (conn == null) {
      try {
        if (_constructor == null) {
          Class<?> cl = Class.forName("com.caucho.server.admin.RemoteMBeanServerConnection");

          _constructor = cl.getConstructor(new Class[] { String.class });
        }

        conn = (MBeanServerConnection)  _constructor.newInstance(serverId);
        
        _connMap.put(serverId, conn);
      } catch (RuntimeException e) {
        throw e;
      } catch (InvocationTargetException e) {
        throw ConfigException.create(e);
      } catch (Exception e) {
        log.log(Level.FINER, e.toString(), e);

        throw new ConfigException(L.l("remote mbeans require Resin Professional"));
      }
    }
    
    return conn;
  }
}