myapp.java

pastry的java实现的2.0b版

/*************************************************************************

"FreePastry" Peer-to-Peer Application Development Substrate 

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/*
 *  Created on Feb 15, 2005
 *
 *  TODO To change the template for this generated file go to
 *  Window - Preferences - Java - Code Style - Code Templates
 */
package rice.tutorial.lesson3;

import rice.p2p.commonapi.Application;
import rice.p2p.commonapi.Endpoint;
import rice.p2p.commonapi.Id;
import rice.p2p.commonapi.Message;
import rice.p2p.commonapi.Node;
import rice.p2p.commonapi.NodeHandle;
import rice.p2p.commonapi.RouteMessage;

/**
 * A very simple application.
 *
 * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
 * @author Jeff Hoye
 */
public class MyApp implements Application {
  /**
   * The Endpoint represents the underlieing node. By making calls on the
   * Endpoint, it assures that the message will be delivered to a MyApp on
   * whichever node the message is intended for.
   */
  protected Endpoint endpoint;

  /**
   * Constructor for MyApp.
   *
   * @param node DESCRIBE THE PARAMETER
   */
  public MyApp(Node node) {
    // We are only going to use one instance of this application on each PastryNode
    this.endpoint = node.buildEndpoint(this, "myinstance");

    // the rest of the initialization code could go here

    // now we can receive messages
    this.endpoint.register();
  }

  /**
   * Called to route a message to the id
   *
   * @param id DESCRIBE THE PARAMETER
   */
  public void routeMyMsg(Id id) {
    System.out.println(this + " sending to " + id);
    Message msg = new MyMsg(endpoint.getId(), id);
    endpoint.route(id, msg, null);
  }

  /**
   * Called to directly send a message to the nh
   *
   * @param nh DESCRIBE THE PARAMETER
   */
  public void routeMyMsgDirect(NodeHandle nh) {
    System.out.println(this + " sending direct to " + nh);
    Message msg = new MyMsg(endpoint.getId(), nh.getId());
    endpoint.route(null, msg, nh);
  }

  /**
   * Called when we receive a message.
   *
   * @param id DESCRIBE THE PARAMETER
   * @param message DESCRIBE THE PARAMETER
   */
  public void deliver(Id id, Message message) {
    System.out.println(this + " received " + message);
  }

  /**
   * Called when you hear about a new neighbor. Don't worry about this method
   * for now.
   *
   * @param handle DESCRIBE THE PARAMETER
   * @param joined DESCRIBE THE PARAMETER
   */
  public void update(NodeHandle handle, boolean joined) {
  }

  /**
   * Called a message travels along your path. Don't worry about this method for
   * now.
   *
   * @param message DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   */
  public boolean forward(RouteMessage message) {
    return true;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @return DESCRIBE THE RETURN VALUE
   */
  public String toString() {
    return "MyApp " + endpoint.getId();
  }

}