view src/samer/core_/util/shell/AgentManager.java @ 0:bf79fb79ee13

Initial Mercurial check in.

/*
 *	AgentManager.java	
 *
 *	Copyright (c) 2000, Samer Abdallah, King's College London.
 *	All rights reserved.
 *
 *	This software is provided AS iS and WITHOUT ANY WARRANTY; 
 *	without even the implied warranty of MERCHANTABILITY or 
 *	FITNESS FOR A PARTICULAR PURPOSE.
 */

package samer.core.util.shell;
import  samer.core.*;
import  java.awt.event.*;
import  java.util.*;

public class AgentManager implements Agent, ActionListener
{
	private Vector  agents=new Vector();
	//private boolean exitOnReturn=false;

	public AgentManager() { Shell.put("AgentManager",this); }

	public ActionListener getBroadcaster() { return this; }

	public void actionPerformed(ActionEvent e) {
		dispatch(e.getActionCommand(),Shell.env());
	}

	public void getCommands(Agent.Registry r) { r.add("help").add("agents"); }
	public void execute(String cmd, Environment env) throws Exception
	{
		if (cmd.equals("agents")) {
			Shell.print("registered agents:");
			Enumeration i=agents.elements();
			while(i.hasMoreElements()) {
				Shell.print(i.nextElement().toString());
			}
		} else if (cmd.equals("help")) help();
	}

	//public void exitOnReturn() { Shell.trace("*** exit on return"); exitOnReturn=true; }

	public void registerAgent(Agent a) {
		Shell.trace("registering agent: "+a);
		agents.addElement(a);
	}

	public void deregisterAgent(Agent a) {
		Shell.trace("deregistering agent: "+a);
		agents.removeElement(a);
	}

	public void dispatch(String cmd, Environment env)
	{
		Enumeration i=agents.elements();
		while(i.hasMoreElements()) {
			Agent agent=(Agent)i.nextElement();
			try { agent.execute(cmd,env); }
			catch (Exception ex) {
				Shell.print("*** agent error in "+agent);
				Shell.print("*** exception: "+ex);
				ex.printStackTrace();
			}
		}
		//if (exitOnReturn) System.exit(0);
	}

	public void help()
	{
		Shell.print("____________________________________");
		Shell.print("Registered Agents and their commands");

		Enumeration i=agents.elements();
		Agent.Registry printer = new Agent.Registry() {
			public void setTarget(Agent a) {}
			public Registry add( String name) { Shell.print("\t"+name); return this; }
			public Registry add( String name, boolean initialValue) {
				Shell.print("\t"+name+" (boolean)"); return this;
			}
			public void group() { Shell.print("............"); }
		};

		while(i.hasMoreElements()) {
			Agent a=(Agent)(i.nextElement());
			Shell.print("");
			Shell.print("---- "+a.getClass().getName());
			a.getCommands(printer);
		}
	}
}