/*
 * JMXManager.java
 *
 * Created on June 9, 2005, 9:36 AM
 */

package gencodeExample;

import java.util.Iterator;
import java.util.Map;
import java.util.HashMap;
import java.util.Set;
import javax.management.MBeanServerConnection;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;

/**
 * JMX Manager class.
 * @author an156382
 */

public class JMXManager {
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws Exception {
        
        //manager object construction
        JMXManager manager = JMXManager.getDefault();
        
        
        /* *** SAMPLE MBEAN NAME DISCOVERY *** */
          /*
          Set resultSet =
              manager.getMBeanServerConnection().queryNames(null, null);
          for(Iterator i = resultSet.iterator(); i.hasNext();) {
              System.out.println("MBean name: " + i.next());
          }
           */
        
        //close connection
        manager.close();
        
        System.out.println("Connection closed.");
        
    }
    
    /**
     * JMX Agent connection
     */
    public void connect() throws Exception {
        
        //RMI Authentication
        Map map = new HashMap();
        map.put(JMXConnector.CREDENTIALS,
                          new String[]{"alex", "mypasswd"});
                
        //Create JMX Agent URL
        JMXServiceURL url = new JMXServiceURL("rmi", null, 0,
                        "/jndi/rmi://jmxrmi") ;
                
        //Connect the JMXConnector
        connector = JMXConnectorFactory.connect(url, map);
                
        //Get the MBeanServerConnection
        mbsc = connector.getMBeanServerConnection();
    }
    
    /**
     * Returns a manager singleton.
     */
    public synchronized static JMXManager getDefault() throws Exception {
        if(singleton == null) {
            singleton = new JMXManager();
            singleton.connect();
        }
        return singleton;
    }
    
    public MBeanServerConnection getMBeanServerConnection() {
        return mbsc;
    }
    
    public void close() throws Exception {
        
        //Close the connection
        connector.close();
    }
    
    //MBeanServerConnection definition
    private MBeanServerConnection mbsc;
    
    //The JMX Connector definition
    private JMXConnector connector;
    
    //Singleton instance
    private static JMXManager singleton;
}