sendoptions.java

pastry的java实现的2.0b版

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

"FreePastry" Peer-to-Peer Application Development Substrate 

Copyright 2002, Rice University. All rights reserved.

Redistribution and use in source and binary forms, with or without
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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
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

- Neither  the name  of Rice  University (RICE) nor  the names  of its
contributors may be  used to endorse or promote  products derived from
this software without specific prior written permission.

This software is provided by RICE and the contributors on an "as is"
basis, without any representations or warranties of any kind, express
or implied including, but not limited to, representations or
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********************************************************************************/
package rice.pastry.routing;

import java.io.*;

/**
 * This is the options for a client to send messages.
 *
 * @version $Id: SendOptions.java 2556 2005-06-07 22:02:14Z jeffh $
 * @author Andrew Ladd
 */

public class SendOptions implements Serializable {
  private boolean random;

  private boolean noShortCuts;

  private boolean shortestPath;

  private boolean allowMultipleHops;

  private boolean rerouteIfSuspected;

  /**
   * DESCRIBE THE FIELD
   */
  public final static boolean defaultRandom = false;

  /**
   * DESCRIBE THE FIELD
   */
  public final static boolean defaultNoShortCuts = true;

  /**
   * DESCRIBE THE FIELD
   */
  public final static boolean defaultShortestPath = true;

  /**
   * DESCRIBE THE FIELD
   */
  public final static boolean defaultAllowMultipleHops = true;

  /**
   * DESCRIBE THE FIELD
   */
  public final static boolean defaultRerouteIfSuspected = true;

  /**
   * Constructor.
   */

  public SendOptions() {
    random = defaultRandom;
    noShortCuts = defaultNoShortCuts;
    shortestPath = defaultShortestPath;
    allowMultipleHops = defaultAllowMultipleHops;
    rerouteIfSuspected = defaultRerouteIfSuspected;
  }

  /**
   * Constructor.
   *
   * @param random true if randomize the route
   * @param noShortCuts true if require each routing step to go to a node whose
   *      id matches in exactly one more digit
   * @param shortestPath true if require to go to the strictly nearest known
   *      node with appropriate node id
   * @param allowMultipleHops true if we allow multiple hops for this
   *      transmission, false otherwise.
   * @param rerouteIfSuspected DESCRIBE THE PARAMETER
   */

  public SendOptions(boolean random, boolean noShortCuts, boolean shortestPath,
                     boolean allowMultipleHops, boolean rerouteIfSuspected) {
    this.random = random;
    this.noShortCuts = noShortCuts;
    this.shortestPath = shortestPath;
    this.allowMultipleHops = allowMultipleHops;
    this.rerouteIfSuspected = rerouteIfSuspected;
  }

  /**
   * Sets the MultipleHopsAllowed attribute of the SendOptions object
   *
   * @param b The new MultipleHopsAllowed value
   */
  public void setMultipleHopsAllowed(boolean b) {
    allowMultipleHops = b;
  }

  /**
   * Sets the RerouteIfSuspected attribute of the SendOptions object
   *
   * @param b The new RerouteIfSuspected value
   */
  public void setRerouteIfSuspected(boolean b) {
    rerouteIfSuspected = b;
  }

  /**
   * Returns whether randomizations on the route are allowed.
   *
   * @return true if randomizations are allowed.
   */

  public boolean canRandom() {
    return random;
  }

  /**
   * Returns whether it is required for each routing step to go to a node whose
   * id matches in exactly one more digit.
   *
   * @return true if it is required to go to a node whose id matches in exactly
   *      one more digit.
   */

  public boolean makeNoShortCuts() {
    return noShortCuts;
  }

  /**
   * Returns whether it is required to go to the strictly nearest known node
   * with appropriate node id.
   *
   * @return true if it is required to go to the strictly nearest known node
   *      with appropriate node id.
   */

  public boolean requireShortestPath() {
    return shortestPath;
  }

  /**
   * Returns whether multiple hops are allowed during the transmission of this
   * message.
   *
   * @return true if so, false otherwise.
   */

  public boolean multipleHopsAllowed() {
    return allowMultipleHops;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @return DESCRIBE THE RETURN VALUE
   */
  public boolean rerouteIfSuspected() {
    return rerouteIfSuspected;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param in DESCRIBE THE PARAMETER
   * @exception IOException DESCRIBE THE EXCEPTION
   * @exception ClassNotFoundException DESCRIBE THE EXCEPTION
   */
  private void readObject(ObjectInputStream in) throws IOException,
    ClassNotFoundException {
    random = in.readBoolean();
    noShortCuts = in.readBoolean();
    shortestPath = in.readBoolean();
    allowMultipleHops = in.readBoolean();
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param out DESCRIBE THE PARAMETER
   * @exception IOException DESCRIBE THE EXCEPTION
   * @exception ClassNotFoundException DESCRIBE THE EXCEPTION
   */
  private void writeObject(ObjectOutputStream out) throws IOException,
    ClassNotFoundException {
    out.writeBoolean(random);
    out.writeBoolean(noShortCuts);
    out.writeBoolean(shortestPath);
    out.writeBoolean(allowMultipleHops);
  }

}