mobilityevents.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

/*
 * @(#)MobilityEvents.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.events;

import com.ibm.aglet.*;
import com.ibm.aglet.event.*;

/**
 * MobilityEvents
 *
 * Sample program for the use of Mobility Listener.
 * Counts the number of hops and keeps the history of hopping.
 * @version     1.01
 * @author	Yoshiaki Mima
 */
public class MobilityEvents extends Aglet implements MobilityListener{
   String history = null;        // history
   int count = 0;                // hopping counter
   
   public void onCreation(Object arg) {
      history = "[History of MobilityEvents]\n";
      count = 0;
      addMobilityListener(this);
   }

   public void onArrival(MobilityEvent ev) {
      count += 1;
      history += "onArrival: " + getAgletContext().getHostingURL().toString() + "\n";
   }
   
   public void onDispatching(MobilityEvent ev) {
      history += "onDispatching: " + getAgletContext().getHostingURL().toString() + "\n";
   }
   
   public void onReverting(MobilityEvent ev) {
      history += "onReverting: " + getAgletContext().getHostingURL().toString() + "\n";
   }
   
   public void run() {
      setText("hopping count: " + count);
   }
   
   public boolean handleMessage(Message msg) {
   
      if (msg.sameKind("dialog")) {          // show history
         System.out.println(history);
         return true;
      } else if (msg.sameKind("clear")) {    // reset history and count
         history = "";
         count = 0;
         return true;
      }
      return false;
   }
}