fablistener.java

移动Agent编程工具Naplet

/* @<#>FabListener.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 fabonacci;

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

public class FabListener
    extends UnicastRemoteObject
    implements NapletListener
{

  public FabListener()
      throws RemoteException
  {};

  // Collect results from a partition of hosts
  public void report( Object res )
      throws RemoteException
  {
    ArrayList result = ( ArrayList ) res;
    Iterator iter = result.iterator();
    System.out.println( "Sequence of Fabonacci Numbers: " );
    while ( iter.hasNext() )
    {
      System.out.print( ( ( Integer ) iter.next() ).toString() + " " );
    }
    System.out.println();

    try
    {
      String host = UnicastRemoteObject.getClientHost();
      InetAddress hostAddress = InetAddress.getByName( host );
      String hostName = hostAddress.getHostName();
      System.out.println( "Result 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 );
  }
}