[jboss-user] [Clustering/JBoss] - How to auto-start my singleton service?

[karanmg]

I am using JDK 5, JBoss 4.0.5GA and Windows. I'm fairly familiar with clustering, but barely with MBeans and sar archives.

I have gone through several posts, documentation and the wiki, and finally 
managed to make a MBean service. I deployed the sar to farm/ it gets copied to all nodes. When I go to the web-console, I can see that the service has been successfully deployed on both the nodes. The jboss-service.xml of the sar contains:


  |    <mbean code="com.tcore.jboss.service.SingletonServiceExample" 
  |           name="tcore.services:service=SingletonServiceExample">
  |           <depends>jboss.ha:service=HASingletonDeployer,type=Barrier</depends>
  |           <attribute name="Message">Message in the XML</attribute>
  |    </mbean>
  | 

Shouldn't the service automatically start on whichever node is the master?
I can manually invoke the start() operation which prints a diagnostic message to let me know that the service has started. But how do I make it work so that whichever node becomes master the service starts and when it loses master status, the service stops?

Following is the service code:

  | package com.tcore.jboss.service;
  | 
  | public interface SingletonServiceExampleMBean
  | {
  | 	public String getMessage();
  | 	public void setMessage(String message);
  | 	   
  | 	public void printMessage();	
  | 	public boolean isTheMasterNode();
  | 
  | 	public void startSingleton() throws Exception;
  | 	public void stopSingleton();		   
  | }
  | 


  | package com.tcore.jboss.service;
  | 
  | public class SingletonServiceExample implements SingletonServiceExampleMBean
  | {
  | 
  | 	private String message;
  | 	private boolean theMasterNode = false;
  | 		
  | 	public void startSingleton() throws Exception
  | 	{
  | 		theMasterNode = true;
  | 		message = "I have been started! " + theMasterNode;
  | 		System.out.println("Starting with message: " + message);		
  | 	}	
  | 	
  | 	public void stopSingleton()
  | 	{
  | 		theMasterNode = false;
  | 		message = "I have been stopped!" + theMasterNode;
  | 		System.out.println("Stopping with message: " + message);
  | 	}
  | 
  | 	public String getMessage()
  | 	{ return message; }
  | 
  | 	public void setMessage(String message)
  | 	{ this.message = message; }
  | 	
  | 	public void printMessage()
  | 	{ System.out.println(message); }
  | 
  | 	public boolean isTheMasterNode()
  | 	{ return theMasterNode; }
  | 
  | }
  | 

Thanks!


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