pingtestrecord.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.pastry.testing;

import rice.pastry.direct.TestRecord;

/**
 * PingAddress A performance test suite for pastry.
 *
 * @version $Id: PingTestRecord.java 2805 2005-11-17 16:22:24Z jeffh $
 * @author Rongmei Zhang
 */

public class PingTestRecord extends TestRecord {
  private int nIndex;

  private int nHops[];

  private double fProb[];

  private double fHops;

  private double fDistance = 0;

  /**
   * Constructor for PingTestRecord.
   *
   * @param n DESCRIBE THE PARAMETER
   * @param k DESCRIBE THE PARAMETER
   * @param baseBitLength DESCRIBE THE PARAMETER
   */
  public PingTestRecord(int n, int k, int baseBitLength) {
    super(n, k);

    nIndex = (int) Math.ceil(Math.log(n) / Math.log(Math.pow(2, baseBitLength)));
    nIndex *= 3;
    nHops = new int[nIndex * 2];
    fProb = new double[nIndex * 2];
  }

  /**
   * Gets the AveHops attribute of the PingTestRecord object
   *
   * @return The AveHops value
   */
  public double getAveHops() {
    return fHops;
  }

  /**
   * Gets the AveDistance attribute of the PingTestRecord object
   *
   * @return The AveDistance value
   */
  public double getAveDistance() {
    return fDistance;
  }

  /**
   * Gets the Probability attribute of the PingTestRecord object
   *
   * @return The Probability value
   */
  public double[] getProbability() {
    return fProb;
  }

  /**
   * DESCRIBE THE METHOD
   */
  public void doneTest() {
    int i;
    //calculate averages ...
    long sum = 0;
    for (i = 0; i < nIndex; i++) {
      sum += nHops[i] * i;
    }
    fHops = ((double) sum) / nTests;
    fDistance = fDistance / nTests;

    for (i = 0; i < nIndex; i++) {
      fProb[i] = i * nHops[i] / ((double) sum);
    }
  }

  /**
   * Adds a feature to the Hops attribute of the PingTestRecord object
   *
   * @param index The feature to be added to the Hops attribute
   */
  public void addHops(int index) {
    nHops[index]++;
  }

  /**
   * Adds a feature to the Distance attribute of the PingTestRecord object
   *
   * @param rDistance The feature to be added to the Distance attribute
   */
  public void addDistance(double rDistance) {
    fDistance += rDistance;
  }
}