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

"FreePastry" Peer-to-Peer Application Development Substrate 

Copyright 2002, Rice University. All rights reserved.

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modification, are permitted provided that the following conditions are
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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
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
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********************************************************************************/

package rice.pastry.testing;

import rice.environment.Environment;
import rice.environment.logging.Logger;
import rice.environment.params.simple.SimpleParameters;
import rice.pastry.*;
import rice.pastry.direct.*;
import rice.pastry.standard.*;
import rice.pastry.join.*;
import rice.pastry.client.*;
import rice.pastry.messaging.*;
import rice.pastry.security.*;
import rice.pastry.routing.*;
import rice.pastry.leafset.*;

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

/**
 * ClosestRegrTest A test suite for the getClosest algorithm. getClosest
 * attempts to choose routing table entries with the closet proximity. Consider
 * this test a PASS if the closest node is there more than 50% of the time.
 * Potentially this test should be run daily and the proximity recorded over
 * time to see if there was a drastic change based on algorithmic change.
 *
 * @version $Id: ClosestRegrTest.java 2844 2005-12-15 13:07:05Z jeffh $
 * @author alan mislove
 */
public class ClosestRegrTest {

  private PastryNodeFactory factory;
  private NetworkSimulator simulator;
  private Vector pastryNodes;

  int incorrect = 0;
  double sum = 0;

  private Environment environment;

  /**
   * DESCRIBE THE FIELD
   */
  public static int NUM_NODES = 1000;

  /**
   * constructor
   *
   * @exception IOException DESCRIBE THE EXCEPTION
   */
  private ClosestRegrTest() throws IOException {
    environment = new Environment(null, null, null, new DirectTimeSource(System.currentTimeMillis()), null,
      new SimpleParameters(Environment.defaultParamFileArray, null));
    simulator = new SphereNetwork(environment);
    factory = new DirectPastryNodeFactory(new RandomNodeIdFactory(environment), simulator, environment);
    pastryNodes = new Vector();
  }

  /**
   * Get pastryNodes.last() to bootstrap with, or return null.
   *
   * @return The Bootstrap value
   */
  protected NodeHandle getBootstrap() {
    NodeHandle bootstrap = null;

    try {
      PastryNode lastnode = (PastryNode) pastryNodes.lastElement();
      bootstrap = lastnode.getLocalHandle();
    } catch (NoSuchElementException e) {
    }

    return bootstrap;
  }

  /**
   * Gets the AvgNumEntries attribute of the ClosestRegrTest object
   *
   * @param nds DESCRIBE THE PARAMETER
   * @return The AvgNumEntries value
   */
  protected double getAvgNumEntries(Collection nds) {
    double sum = 0;
    Iterator i = nds.iterator();
    while (i.hasNext()) {
      PastryNode pn = (PastryNode) i.next();
      sum += pn.getRoutingTable().numUniqueEntries();
    }
    return sum / nds.size();
  }

  /**
   * initializes the network and prepares for testing
   */
  protected void run() {
    for (int i = 0; i < NUM_NODES; i++) {
      PastryNode node = factory.newNode(getBootstrap());
      if (i > 0) {
        test(i, (DirectNodeHandle) node.getLocalHandle());
      }

      while (simulator.simulate()) {
      }

      System.out.println("CREATED NODE " + i + " " + node.getNodeId());

      pastryNodes.add(node);
      double ave = getAvgNumEntries(pastryNodes);
      System.out.println("Avg Num Entries:" + ave);
    }

    System.out.println("SO FAR: " + incorrect + "/" + NUM_NODES + " PERCENTAGE: " + (sum / incorrect));
  }

  /**
   * starts the testing process
   *
   * @param i DESCRIBE THE PARAMETER
   * @param handle DESCRIBE THE PARAMETER
   */
  protected void test(int i, DirectNodeHandle handle) {
    PastryNode bootNode = (PastryNode) pastryNodes.elementAt(environment.getRandomSource().nextInt(i));
    NodeHandle bootstrap = bootNode.getLocalHandle();
//    System.out.println();
    DirectNodeHandle closest = (DirectNodeHandle) factory.getNearest(handle, bootstrap);
    DirectNodeHandle realClosest = simulator.getClosest(handle);

    if (!closest.getNodeId().equals(realClosest.getNodeId())) {
      incorrect++;
      int cProx = simulator.proximity(closest, handle);
      int rProx = simulator.proximity(realClosest, handle);
      sum += (cProx / rProx);

      System.out.println("ERROR: CLOSEST TO " + handle + " WAS " + closest.getNodeId() + ":" + cProx + " REAL CLOSEST: " + realClosest.getNodeId() + ":" + rProx);
      System.out.println("SO FAR: " + incorrect + "/" + i + " PERCENTAGE: " + (sum / incorrect));

//      NodeHandle closest2 = factory.getNearest(handle, bootstrap);
//      System.out.println(closest2);
//      NodeHandle realClosest2 = simulator.getClosest(nodeId);
    }
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @return DESCRIBE THE RETURN VALUE
   */
  public boolean pass() {
    return incorrect < NUM_NODES / 2;
  }

  /**
   * main
   *
   * @param args DESCRIBE THE PARAMETER
   * @exception IOException DESCRIBE THE EXCEPTION
   */
  public static void main(String args[]) throws IOException {
    ClosestRegrTest pt = new ClosestRegrTest();
    pt.run();
    System.out.println("pass:" + pt.pass());
    pt.environment.destroy();
  }
}

