aggregationmessage.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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********************************************************************************/
package rice.p2p.aggregation.messaging;

import java.io.IOException;

import rice.*;
import rice.p2p.commonapi.*;
import rice.p2p.commonapi.rawserialization.*;
import rice.p2p.glacier.*;

/**
 * DESCRIBE THE CLASS
 *
 * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
 * @author jeffh
 */
public abstract class AggregationMessage implements Message {

  // the unique id for this message
  /**
   * DESCRIBE THE FIELD
   */
  protected int id;

  // the source Id of this message
  /**
   * DESCRIBE THE FIELD
   */
  protected NodeHandle source;

  // the destination of this message
  /**
   * DESCRIBE THE FIELD
   */
  protected Id dest;

  /**
   * Constructor which takes a unique integer Id
   *
   * @param id The unique id
   * @param source The source address
   * @param dest The destination address
   */
  protected AggregationMessage(int id, NodeHandle source, Id dest) {
    this.id = id;
    this.source = source;
    this.dest = dest;
  }

  /**
   * Method which should return the priority level of this message. The messages
   * can range in priority from 0 (highest priority) to Integer.MAX_VALUE
   * (lowest) - when sending messages across the wire, the queue is sorted by
   * message priority. If the queue reaches its limit, the lowest priority
   * messages are discarded. Thus, applications which are very verbose should
   * have LOW_PRIORITY or lower, and applications which are somewhat quiet are
   * allowed to have MEDIUM_PRIORITY or possibly even HIGH_PRIORITY.
   *
   * @return This message's priority
   */
  public byte getPriority() {
    return MEDIUM_LOW_PRIORITY;
  }

  /**
   * Method which returns this messages' unique id
   *
   * @return The id of this message
   */
  public int getUID() {
    return id;
  }

  /**
   * Method which returns this messages' source address
   *
   * @return The source of this message
   */
  public NodeHandle getSource() {
    return source;
  }

  /**
   * Method which returns this messages' destination address
   *
   * @return The dest of this message
   */
  public Id getDestination() {
    return dest;
  }

//  public AggregationMessage(InputBuffer buf, Endpoint endpoint) throws IOException {
//    id = buf.readInt();
//    dest = endpoint.readId(buf, buf.readShort());
//    source = endpoint.readNodeHandle(buf);
//  }
//
//  public void serialize(OutputBuffer buf) throws IOException {
//    buf.writeInt(id);
//    buf.writeShort(dest.getType());
//    dest.serialize(buf);
//    source.serialize(buf);
//  }
}