jadex.platform.service.awareness.discovery.MasterSlaveDiscoveryAgent Maven / Gradle / Ivy

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The Jadex platform package contains implementations of platform services as well as the platform component itself.

There is a newer version: 3.0.117

package jadex.platform.service.awareness.discovery;


import jadex.commons.future.DelegationResultListener;
import jadex.commons.future.Future;
import jadex.commons.future.IFuture;
import jadex.micro.annotation.AgentBody;
import jadex.micro.annotation.AgentKilled;

/**
 *  Agent that sends multicasts to locate other Jadex awareness agents.
 */
public abstract class MasterSlaveDiscoveryAgent extends DiscoveryAgent
{
	//-------- attributes --------
		
	/** The local slaves. */
	protected LeaseTimeHandler locals;
	
	/** The local slaves. */
	protected LeaseTimeHandler remotes;
	
	//-------- methods --------
	
	/**
	 *  Execute the functional body of the agent.
	 *  Is only called once.
	 */
	@AgentBody
	public void executeBody()
	{
		this.locals = new LeaseTimeHandler(this);
		this.remotes = new LeaseTimeHandler(this)
		{
			public void entryDeleted(DiscoveryEntry entry)
			{
				// If master is lost, try to become master
				// If master is lost, try to become master
				String mid = entry.getInfo().getMasterId();
				String mymid = getMyMasterId();
//				System.out.println("mid:_"+mid+" "+mymid);
				if(mid!=null && mid.equals(mymid))
				{
//					System.out.println("Master deleted.");
					
					try
					{
						initNetworkRessource();
					}
					catch (Exception e) 
					{
						getMicroAgent().getLogger().warning("Receive problem: "+e);
//						e.printStackTrace();
					}
				}
			}
		};
		
		// Start sending/receiving
		super.executeBody();
	}
	
	/**
	 *  Get the locals.
	 *  @return the locals.
	 */
	public LeaseTimeHandler getLocals()
	{
		return locals;
	}

	/**
	 *  Get the remotes.
	 *  @return the remotes.
	 */
	public LeaseTimeHandler getRemotes()
	{
		return remotes;
	}
	
	/**
	 *  Test if is master.
	 */
	protected abstract boolean isMaster();
	
	/**
	 *  Create the master id.
	 */
	protected abstract String createMasterId();
	
	/**
	 *  Get the local master id.
	 */
	protected abstract String getMyMasterId();

	@AgentKilled
	public IFuture agentKilled()
	{
		Future	ret	= new Future();
		super.agentKilled().addResultListener(new DelegationResultListener(ret)
		{
			public void customResultAvailable(Void result)
			{
				if(locals!=null)
					locals.dispose();
				if(remotes!=null)
					remotes.dispose();
				super.customResultAvailable(result);
			}
		});
		return ret;
	}
}