hellolistener.java

移动Agent编程工具Naplet

/* @<#>HelloListener.java version 0.0.1, 1/1/2000
 *
 * THIS PROGRAM IS FREE SOFTWARE; YOU CAN DISTRIBUTED IT AND/OR
 * MODIFY IT UNDER THE TERMS OF THE GNU GENERAL PUBLIC LICENSE
 * AS PUBLISHED BY THE FREE SOFTWARE FOUNDATION.
 *
 * THIS PROGRAM IS DISTRIBUTED IN THE HOPE THAT IT WILL BE USEFUL,
 * BUT WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. SEE THE
 * GNU GENERAL PUBLIC LICENSE FOR MORE DETAILS.
 *
 * Copyright (c) 2000 Wayne State University. All Rights Reserved.
 */

package hello;

import java.io.*;
import java.util.*;
import java.rmi.*;
import java.rmi.server.*;
import java.net.*; // For address conversion InetAddress.getByName

import naplet.*;

/**
 * The <code>HelloListener</code> defines an asynchronous interface for
 * remote naplets to call back
 *
 * @version 0.0.1, 1/1/2000
 * @author C. Xu
 */

public class HelloListener
    extends UnicastRemoteObject
    implements NapletListener
{

  public HelloListener()
      throws RemoteException
  {};

  // Collect results from a partition of hosts
  public void report( Object result )
      throws RemoteException
  {
    Hashtable messages = ( Hashtable ) result;

    for ( Enumeration e = messages.elements(); e.hasMoreElements(); )
    {
      String msg = ( String ) e.nextElement();
      System.out.println( msg );
    }
    try
    {
      String host = UnicastRemoteObject.getClientHost();
      InetAddress hostAddress = InetAddress.getByName( host );
      String hostName = hostAddress.getHostName();
      System.out.println( "Message comes from " + hostName );
    }
    catch ( ServerNotActiveException se )
    {
      System.out.println( "report err: " + se.getMessage() );
      se.printStackTrace();
    }
    catch ( Exception e )
    {
      System.out.println( "report err: " + e.getMessage() );
      e.printStackTrace();
    }

    System.exit( 0 );
  }
}