processingrequest.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
modification, are permitted provided that the following conditions are
met:

- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

- 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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particular purpose. In no event shall RICE or contributors be liable
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business interruption) however caused and on any theory of liability,
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********************************************************************************/
/*
 *  Created on Aug 9, 2005
 */
package rice.environment.processing.simple;

import rice.*;
import rice.environment.logging.*;
import rice.environment.time.TimeSource;
import rice.pastry.dist.DistPastryNode;
import rice.selector.SelectorManager;

/**
 * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
 * @author Jeff Hoye
 */
public class ProcessingRequest implements Runnable {
  Continuation c;
  Executable r;

  TimeSource timeSource;
  SelectorManager selectorManager;
  Logger logger;

  /**
   * Constructor for ProcessingRequest.
   *
   * @param r DESCRIBE THE PARAMETER
   * @param c DESCRIBE THE PARAMETER
   * @param logging DESCRIBE THE PARAMETER
   * @param timeSource DESCRIBE THE PARAMETER
   * @param selectorManager DESCRIBE THE PARAMETER
   */
  public ProcessingRequest(Executable r, Continuation c, LogManager logging, TimeSource timeSource, SelectorManager selectorManager) {
    this.r = r;
    this.c = c;

    logger = logging.getLogger(getClass(), null);
    this.timeSource = timeSource;
    this.selectorManager = selectorManager;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param o DESCRIBE THE PARAMETER
   */
  public void returnResult(Object o) {
    c.receiveResult(o);
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param e DESCRIBE THE PARAMETER
   */
  public void returnError(Exception e) {
    c.receiveException(e);
  }

  /**
   * Main processing method for the ProcessingRequest object
   */
  public void run() {
    if (logger.level <= Logger.FINER) {
      logger.log("COUNT: Starting execution of " + this);
    }
    try {
      long start = timeSource.currentTimeMillis();
      final Object result = r.execute();
      if (logger.level <= Logger.FINEST) {
        logger.log("QT: " + (timeSource.currentTimeMillis() - start) + " " + r.toString());
      }

      selectorManager.invoke(
        new Runnable() {
          public void run() {
            returnResult(result);
          }

          public String toString() {
            return "return ProcessingRequest for " + r + " to " + c;
          }
        });
    } catch (final Exception e) {
      selectorManager.invoke(
        new Runnable() {
          public void run() {
            returnError(e);
          }

          public String toString() {
            return "return ProcessingRequest for " + r + " to " + c;
          }
        });
    }
    if (logger.level <= Logger.FINER) {
      logger.log("COUNT: Done execution of " + this);
    }
  }
}