stationaryaglet.java

移动Agent编程IBM开发的移动Agent编程工具Aglet 采用纯Java编写可移植性好这是用它写的一些例子用于初级入门

/*
 * @(#)StationaryAglet.java
 *
 * 03L7246 (c) Copyright IBM Corp. 1996, 1998
 *
 * The program is provided "as is" without any warranty express or
 * implied, including the warranty of non-infringement and the implied
 * warranties of merchantibility and fitness for a particular purpose.
 * IBM will not be liable for any damages suffered by you as a result
 * of using the Program. In no event will IBM be liable for any
 * special, indirect or consequential damages or lost profits even if
 * IBM has been advised of the possibility of their occurrence. IBM
 * will not be liable for any third party claims against you.
 */

package examples.itinerary;

import com.ibm.aglet.*;
import com.ibm.aglet.event.*;
import com.ibm.agletx.patterns.Meeting;

public final class StationaryAglet extends Aglet implements MobilityListener {

    private Meeting meeting = null;
    boolean dispatched = false;

    public StationaryAglet () {
    }

    public void onCreation(Object ini) {
		print("created!");
		addMobilityListener(this);
		meeting = (Meeting)ini;
    }


    public void onDisposing () {
		print("disposed!!");
    }


    public boolean handleMessage(Message msg) {
		if (msg.sameKind("dispose")) {
	    	try { 
			dispose();
			return true;
	    	} catch (Exception ex) {
				ex.printStackTrace();
	    	}
		} else if ( (meeting != null) && (msg.sameKind(meeting.getID())) ) {
	    	meet((AgletID)(msg.getArg()));
	    	msg.sendReply(getAgletID());
	    	dispose();
	    	return true;
		}
		return false;
    }


    public void onArrival (MobilityEvent ev) {
		print("on Arrival");
		dispatched=true;
		try { 
	    	meeting.ready(this);
		} catch (Exception ex) {	
	    	ex.printStackTrace();
		}
    }


    public void onReverting(MobilityEvent ev) {
		throw new SecurityException();
    }


    public void onDispatching(MobilityEvent ev) {
		if (dispatched) {
	    	throw new SecurityException("Don't try to move me!!");
		}
    }


    private void print (String txt) {
		System.out.println(">>>StationaryAglet:" + txt);
    }	


    private void meet (AgletID id) {
		print("[" + getAgletID() + "] I met with VisitingAglet [id=" + id + "]");
    }

}