gcnode.java

pastry的java实现的2.0b版

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"FreePastry" Peer-to-Peer Application Development Substrate 

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package rice.p2p.past.gc;

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

/**
 * @(#) GCNode.java This class wraps a Node
 *
 * @version $Id: GCNode.java 3274 2006-05-15 16:17:47Z jeffh $
 * @author Alan Mislove
 */
public class GCNode implements Node {

  /**
   * The node which this mulitring node is wrapping
   */
  protected Node node;

  /**
   * Constructor
   *
   * @param node The node which this multiring node is wrapping
   */
  public GCNode(Node node) {
    this.node = node;
  }

  /**
   * This returns a Endpoint specific to the given application and instance name
   * to the application, which the application can then use in order to send an
   * receive messages. This method allows advanced developers to specify which
   * "port" on the node they wish their application to register as. This "port"
   * determines which of the applications on top of the node should receive an
   * incoming message. NOTE: Use of this method of registering applications is
   * recommended only for advanced users - 99% of all applications should just
   * use the other registerApplication
   *
   * @return The endpoint specific to this applicationk, which can be used for
   *      message sending/receiving.
   */
//  public Endpoint registerApplication(Application application, int port) {
//    return new GCEndpoint(node.registerApplication(application, port));
//  }

  /**
   * Method which returns the node handle to the local node
   *
   * @return A handle to the local node
   */
  public NodeHandle getLocalNodeHandle() {
    return node.getLocalNodeHandle();
  }

  /**
   * Returns the Id of this node
   *
   * @return This node's Id
   */
  public Id getId() {
    return node.getId();
  }

  /**
   * Returns a factory for Ids specific to this node's protocol.
   *
   * @return A factory for creating Ids.
   */
  public IdFactory getIdFactory() {
    return new GCIdFactory(node.getIdFactory());
  }

  /*
   *  (non-Javadoc)
   *  @see rice.p2p.commonapi.Node#getEnvironment()
   */
  /**
   * Gets the Environment attribute of the GCNode object
   *
   * @return The Environment value
   */
  public Environment getEnvironment() {
    return node.getEnvironment();
  }

  /**
   * This returns a VirtualizedNode specific to the given application and
   * instance name to the application, which the application can then use in
   * order to send an receive messages.
   *
   * @param application The Application
   * @param instance An identifier for a given instance
   * @return The endpoint specific to this applicationk, which can be used for
   *      message sending/receiving.
   */
  public Endpoint registerApplication(Application application, String instance) {

    GCEndpoint gce = new GCEndpoint(node.buildEndpoint(application, instance));
    gce.register();
    return gce;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param application DESCRIBE THE PARAMETER
   * @param instance DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   */
  public Endpoint buildEndpoint(Application application, String instance) {
    return new GCEndpoint(node.buildEndpoint(application, instance));
  }

  /**
   * Prints out the string
   *
   * @return A string
   */
  public String toString() {
    return "{GCNode " + node + "}";
  }
}