scribeclient.java

p2p仿真器。开发者可以工作在覆盖层中进行创造和测试逻辑算法或者创建和测试新的服务。PlanetSim还可以将仿真代码平稳转换为在Internet上的实验代码

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"FreePastry" Peer-to-Peer Application Development Substrate

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package planet.scribe;

import planet.commonapi.*;

/**
 * This interface represents a client using the Scribe system.
 *
 * @version $Id: ScribeClient.java,v 1.2 2003/10/14 01:49:57 amislove Exp $
 * @author Alan Mislove
 */
public interface ScribeClient {

  /**
   * This method is invoked when an anycast is received for a topic
   * which this client is interested in.  The client should return
   * whether or not the anycast should continue.
   *
   * @param topic The topic the message was anycasted to
   * @param content The content which was anycasted
   * @return Whether or not the anycast should continue
   */
  public boolean anycast(Topic topic, ScribeContent content);

  /**
   * This method is invoked when a message is delivered for a topic this
   * client is interested in.
   *
   * @param topic The topic the message was published to
   * @param content The content which was published
   */
  public void deliver(Topic topic, ScribeContent content);

  /**
   * Informs this client that a child was added to a topic in
   * which it was interested in.
   *
   * @param topic The topic to unsubscribe from
   * @param child The child that was added
   */
  public void childAdded(Topic topic, NodeHandle child);

  /**
   * Informs this client that a child was removed from a topic in
   * which it was interested in.
   *
   * @param topic The topic to unsubscribe from
   * @param child The child that was removed
   */
  public void childRemoved(Topic topic, NodeHandle child);

  /**
   * Informs the client that a subscribe on the given topic failed
   * - the client should retry the subscribe or take appropriate
   * action.
   *
   * @param topic The topic which the subscribe failed on
   */
  public void subscribeFailed(Topic topic);

}