scribe.java

pastry的java实现的2.0b版

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

"FreePastry" Peer-to-Peer Application Development Substrate 

Copyright 2002, Rice University. All rights reserved.

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- Redistributions of source code must retain the above copyright
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- Redistributions in binary form must reproduce the above copyright
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- Neither  the name  of Rice  University (RICE) nor  the names  of its
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This software is provided by RICE and the contributors on an "as is"
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********************************************************************************/

package rice.p2p.scribe;

import rice.*;
import rice.environment.Environment;
import rice.p2p.commonapi.*;
import rice.p2p.scribe.rawserialization.*;

/**
 * @(#) Scribe.java This interface is exported by all instances of Scribe.
 *
 * @version $Id: Scribe.java 3274 2006-05-15 16:17:47Z jeffh $
 * @author Alan Mislove
 */
public interface Scribe extends Destructable {

  /**
   * Subscribes the given client to the provided topic. Any message published to
   * the topic will be delivered to the Client via the deliver() method.
   *
   * @param topic The topic to subscribe to
   * @param client The client to give messages to
   */
  public void subscribe(Topic topic, ScribeClient client);

  /**
   * Subscribes the given client to the provided topic. Any message published to
   * the topic will be delivered to the Client via the deliver() method.
   *
   * @param topic The topic to subscribe to
   * @param client The client to give messages to
   * @param content The content to include in the subscribe
   */
  public void subscribe(Topic topic, ScribeClient client, ScribeContent content);

  /**
   * DESCRIBE THE METHOD
   *
   * @param topic DESCRIBE THE PARAMETER
   * @param client DESCRIBE THE PARAMETER
   * @param content DESCRIBE THE PARAMETER
   */
  public void subscribe(Topic topic, ScribeClient client, RawScribeContent content);

  /**
   * Unsubscribes the given client from the provided topic.
   *
   * @param topic The topic to unsubscribe from
   * @param client The client to unsubscribe
   */
  public void unsubscribe(Topic topic, ScribeClient client);

  /**
   * Publishes the given message to the topic.
   *
   * @param topic The topic to publish to
   * @param content The content to publish
   */
  public void publish(Topic topic, ScribeContent content);

  /**
   * DESCRIBE THE METHOD
   *
   * @param topic DESCRIBE THE PARAMETER
   * @param content DESCRIBE THE PARAMETER
   */
  public void publish(Topic topic, RawScribeContent content);

  /**
   * Anycasts the given content to a member of the given topic
   *
   * @param topic The topic to anycast to
   * @param content The content to anycast
   */
  public void anycast(Topic topic, ScribeContent content);

  /**
   * DESCRIBE THE METHOD
   *
   * @param topic DESCRIBE THE PARAMETER
   * @param content DESCRIBE THE PARAMETER
   */
  public void anycast(Topic topic, RawScribeContent content);

  /**
   * Returns the current policy for this scribe object
   *
   * @return The current policy for this scribe
   */
  public ScribePolicy getPolicy();

  /**
   * Sets the current policy for this scribe object
   *
   * @param policy The current policy for this scribe
   */
  public void setPolicy(ScribePolicy policy);

  /**
   * Returns whether or not this Scribe is the root for the given topic
   *
   * @param topic The topic in question
   * @return Whether or not we are currently the root
   */
  public boolean isRoot(Topic topic);

  /**
   * Returns the list of children for a given topic
   *
   * @param topic The topic to return the children of
   * @return The children of the topic
   */
  public NodeHandle[] getChildren(Topic topic);

  /**
   * Returns the parent node for a given topic
   *
   * @param myTopic The topic to return the parent of
   * @return The parent of the topic
   */
  public NodeHandle getParent(Topic myTopic);

  /**
   * Adds a child to the given topic
   *
   * @param topic The topic to add the child to
   * @param child The child to add
   */
  public void addChild(Topic topic, NodeHandle child);

  /**
   * Removes a child from the given topic
   *
   * @param topic The topic to remove the child from
   * @param child The child to remove
   */
  public void removeChild(Topic topic, NodeHandle child);

  /**
   * Returns the list of topics the given client is subscribed to.
   *
   * @param client The client in question
   * @return The list of topics
   */
  public Topic[] getTopics(ScribeClient client);

  /**
   * @return
   */
  public Environment getEnvironment();

  /**
   * DESCRIBE THE METHOD
   */
  public void destroy();

  /**
   * Sets the ContentDeserializer attribute of the Scribe object
   *
   * @param deserializer The new ContentDeserializer value
   */
  public void setContentDeserializer(ScribeContentDeserializer deserializer);

}