initiatejoin.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"
basis, without any representations or warranties of any kind, express
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********************************************************************************/
package rice.pastry.join;

import rice.pastry.*;
import rice.pastry.messaging.*;

import java.io.*;
import java.util.*;

/**
 * Request for the join protocols on the local node to join the overlay.
 *
 * @version $Id: InitiateJoin.java 3274 2006-05-15 16:17:47Z jeffh $
 * @author Andrew Ladd
 */

public class InitiateJoin extends Message implements Serializable {
  private NodeHandle[] handle;

  /**
   * Constructor.
   *
   * @param nh the node handle that the join will begin from.
   */

  public InitiateJoin(NodeHandle nh) {
    this((NodeHandle[]) null);
    handle = new NodeHandle[1];
    handle[0] = nh;
  }


  /**
   * Constructor for InitiateJoin.
   *
   * @param nh DESCRIBE THE PARAMETER
   */
  public InitiateJoin(NodeHandle[] nh) {
    this(null, nh);
    handle = nh;
  }

  /**
   * Constructor.
   *
   * @param stamp the timestamp
   * @param nh the node handle that the join will begin from.
   */

  public InitiateJoin(Date stamp, NodeHandle[] nh) {
    super(JoinAddress.getCode(), stamp);
    handle = nh;
  }

  /**
   * Gets the handle for the join. Gets the first non-dead handle for the join.
   *
   * @return the handle.
   */
  public NodeHandle getHandle() {
    for (int i = 0; i < handle.length; i++) {
      if (handle[i].isAlive()) {
        return handle[i];
      }
    }
    return null;
  }
}