leafsettest.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 java.io.IOException;
import java.util.*;

import rice.environment.Environment;
import rice.environment.random.RandomSource;
import rice.p2p.commonapi.rawserialization.OutputBuffer;
import rice.p2p.commonapi.RangeCannotBeDeterminedException;
import rice.pastry.*;
import rice.pastry.leafset.*;
import rice.pastry.messaging.Message;
import rice.pastry.standard.RandomNodeIdFactory;

/**
 * This class tests the correctness of the leafset in Pastry.
 *
 * @version $Id: LeafSetTest.java 3274 2006-05-15 16:17:47Z jeffh $
 * @author Alan Mislove
 */
public class LeafSetTest {

  /**
   * DESCRIBE THE FIELD
   */
  protected NodeIdFactory factory;

  /**
   * DESCRIBE THE FIELD
   */
  protected RandomSource random;

  /**
   * Constructor for LeafSetTest.
   */
  public LeafSetTest() {
    Environment env = new Environment();
    random = env.getRandomSource();
    factory = new RandomNodeIdFactory(env);
  }

  /**
   * DESCRIBE THE METHOD
   */
  public void start() {
    testCumulativeRange();
    testNonCumulativeRange();
    testObservers();
  }

  /**
   * A unit test for JUnit
   */
  public void testObservers() {
    int halfLeafSet = 3;
    LeafSet leafset = generateLeafSet(halfLeafSet * 2, halfLeafSet * 2, false);
    System.out.println(leafset);
    leafset.addNodeSetListener(new MyObserver(leafset));

    NodeHandle handle = leafset.get(halfLeafSet);
    System.out.println("Removing " + handle);
    // NodeId nid = (NodeId)handle.getId();
    // NodeHandle nh = handle;
    leafset.remove(handle);

    System.out.println("Adding " + handle);
    leafset.put(handle);

    System.out.println();

    halfLeafSet = 6;
    leafset = generateLeafSet(halfLeafSet * 2, halfLeafSet, false);
    System.out.println(leafset);
    leafset.addNodeSetListener(new MyObserver(leafset));

    for (int j = 0; j < 10; j++) {
      System.out.println();
      for (int i = 0; i < halfLeafSet * 5; i++) {
        handle = new TestNodeHandle(factory.generateNodeId());
        System.out.println("Adding " + handle);
        leafset.put(handle);
      }
      boolean rightSide = false;

      while (leafset.size() > 2) {
        // System.out.println("looping");
        rightSide = !rightSide;
        int r;
        if (rightSide) {
          r = random.nextInt(leafset.cwSize());
          if (r != 0) {
            handle = leafset.get(r);
            System.out.println("Removing " + handle);
            // nid = (NodeId)handle.getId();
            leafset.remove(handle);
            // leafset.remove(r);
          }
        } else {
          r = random.nextInt(leafset.ccwSize());
          if (r != 0) {
            handle = leafset.get(-r);
            System.out.println("Removing " + handle);
            // nid = (NodeId)handle.getId();
            leafset.remove(handle);
            // leafset.remove(-r);
          }
        }
      }
    }
  }

  /**
   * Throws an exception if the test condition is not met.
   *
   * @param intention DESCRIBE THE PARAMETER
   * @param test DESCRIBE THE PARAMETER
   */
  protected final void assertTrue(String intention, boolean test) {
    if (!test) {
      System.out.println(intention + " - failed.");
      System.exit(0);
    }
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param x DESCRIBE THE PARAMETER
   * @param y DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   */
  protected int min(int x, int y) {
    if (y < x) {
      return y;
    } else {
      return x;
    }
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param x DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   */
  protected int abs(int x) {
    if (x < 0) {
      return -x;
    } else {
      return x;
    }
  }

  /**
   * A unit test for JUnit
   */
  public void testCumulativeRange() {
    for (int nodes = 2; nodes < 20; nodes++) {
      for (int size = 2; size < 17; size += 2) {
        LeafSet leafset = generateLeafSet(size, nodes, false);

        System.out.println("Testing cumulative ranges with " + nodes
          + " nodes and leafset size of " + size);

        for (int pos = -min(size / 2, nodes / 2); pos <= min(size / 2,
          nodes / 2); pos++) {

          for (int q = 0; q < size; q++) {
            IdRange range = null;
            try {
              range = leafset.range(leafset.get(pos), q);
            } catch (RangeCannotBeDeterminedException rcbde) {

            }
            if ((q < size / 2 - abs(pos)) || (size + 1 > nodes)) {
              assertTrue("Range of node " + pos + " with q " + q + " nodes "
                + nodes + " size " + size + " should be defined in leafset "
                + leafset, range != null);

              if (q >= nodes - 1) {
                assertTrue("Range of node " + pos + " with q " + q + " nodes "
                  + nodes + " size " + size + " should be full in leafset "
                  + leafset, range.isFull());
              } else {
                assertTrue("Range of node " + pos + " with q " + q + " nodes "
                  + nodes + " size " + size + " should be full in leafset "
                  + leafset, !range.isFull());
              }
            } else {
              assertTrue("Range of node " + pos + " with q " + q + " nodes "
                + nodes + " size " + size
                + " should be not defined in leafset " + leafset,
                range == null);
            }
          }
        }
      }
    }
  }

  /**
   * A unit test for JUnit
   */
  public void testNonCumulativeRange() {
    for (int nodes = 1; nodes < 20; nodes++) {
      for (int size = 2; size < 17; size += 2) {
        LeafSet leafset = generateLeafSet(size, nodes, false);

        System.out.println("Testing non-cumulative ranges with " + nodes
          + " nodes and leafset size of " + size);

        for (int pos = -min(size / 2, nodes / 2); pos <= min(size / 2,
          nodes / 2); pos++) {

          for (int q = 0; q < size; q++) {
            IdRange range = null;
            try {
              range = leafset.range(leafset.get(pos), q, true);
            } catch (RangeCannotBeDeterminedException rcbde) {
            }
            if ((q < size / 2 - abs(pos)) || (size + 1 > nodes)) {
              assertTrue("Range of node " + pos + " with q " + q + " nodes "
                + nodes + " size " + size + " should not be null in leafset "
                + leafset, range != null);

              if (q >= nodes) {
                assertTrue("Range of node " + pos + " with q " + q + " nodes "
                  + nodes + " size " + size + " should be empty in leafset "
                  + leafset, range.isEmpty());
              } else {
                assertTrue("Range of node " + pos + " with q " + q + " nodes "
                  + nodes + " size " + size
                  + " should be defined in leafset " + leafset, !range.isEmpty());
              }
            } else {
              assertTrue("Range of node " + pos + " with q " + q + " nodes "
                + nodes + " size " + size
                + " should be not defined in leafset " + leafset,
                range == null);
            }
          }
        }

        if (size + 1 > nodes) {
          IdRange total = new IdRange();

          for (int q = 0; q < size; q++) {
            total = total.merge(leafset.range(leafset.get(0), q, true));
            total = total.merge(leafset.range(leafset.get(0), q, false));
          }

          assertTrue(
            "Sum of individual ranges should produce entire range with nodes "
            + nodes + " size " + size + " in leafset " + leafset
            + " with total " + total, total.isFull());
        }
      }
    }
  }

  /**
   * Returns a leafset of size size out of a network with the specified number
   * of nodes
   *
   * @param size The size of the leaf set
   * @param nodes The number of nodes in the network
   * @param crossover Whether the leafset must cross over the '0' boundary not
   * @return DESCRIBE THE RETURN VALUE
   */
  protected LeafSet generateLeafSet(int size, int nodes, boolean crossover) {
    NodeHandle[] handles = new NodeHandle[nodes];

    for (int i = 0; i < nodes; i++) {
      handles[i] = new TestNodeHandle(factory.generateNodeId());
    }

    Arrays.sort(handles);

    int i = 0;

    if (crossover) {
      i = (nodes - size + random.nextInt(size)) % nodes;
    } else {
      i = random.nextInt(nodes);
    }

    int base = (i + size / 2) % nodes;
    LeafSet set = new LeafSet(handles[base], size);

    for (int j = 0; j < nodes; j++) {
      set.put(handles[j]);
    }

    return set;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param args DESCRIBE THE PARAMETER
   */
  public static void main(String args[]) {
    LeafSetTest test = new LeafSetTest();
    test.start();
  }

  /**
   * DESCRIBE THE CLASS
   *
   * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
   * @author jeffh
   */
  class MyObserver implements NodeSetListener {
    LeafSet ls;

    /**
     * Constructor for MyObserver.
     *
     * @param ls DESCRIBE THE PARAMETER
     */
    public MyObserver(LeafSet ls) {
      this.ls = ls;
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param set DESCRIBE THE PARAMETER
     * @param handle DESCRIBE THE PARAMETER
     * @param added DESCRIBE THE PARAMETER
     */
    public void nodeSetUpdate(NodeSetEventSource set, NodeHandle handle, boolean added) {
      SimilarSet caller;
      if (set instanceof SimilarSet) {
        caller = (SimilarSet) set;
      }

      if (ls.overlaps() && (ls.ccwSize() != ls.cwSize())) {
        System.out.println("FAILURE: overlaps and different size" + ls);
      }
      if (added) {
        boolean consistent = !ls.directTest(handle);
        if (!consistent) {
          System.out.println("FAILURE:" + handle
            + " was added, but ls is inconsistent.");
          System.out.println(ls);
        } else {
          System.out.println("OK:" + handle + " was added");
        }
      } else {
        // node was removed
        boolean consistent = !ls.member(handle.getNodeId());
        if (!consistent) {
          System.out.println("FAILURE:" + handle
            + " was removed, but ls is inconsistent.");
          System.out.println(ls);
        } else {
          System.out.println("OK:" + handle + " was removed");
        }
      }
    }

  }

  /**
   * DESCRIBE THE CLASS
   *
   * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
   * @author jeffh
   */
  public static class TestNodeHandle extends NodeHandle implements Comparable {
    private Id id;

    /**
     * Constructor for TestNodeHandle.
     *
     * @param id DESCRIBE THE PARAMETER
     */
    public TestNodeHandle(Id id) {
      this.id = id;
    }

    /**
     * Gets the NodeId attribute of the TestNodeHandle object
     *
     * @return The NodeId value
     */
    public Id getNodeId() {
      return id;
    }

    /**
     * Gets the Liveness attribute of the TestNodeHandle object
     *
     * @return The Liveness value
     */
    public int getLiveness() {
      return LIVENESS_ALIVE;
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @return DESCRIBE THE RETURN VALUE
     */
    public int proximity() {
      return 1;
    }

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

    /**
     * DESCRIBE THE METHOD
     *
     * @param obj DESCRIBE THE PARAMETER
     * @return DESCRIBE THE RETURN VALUE
     */
    public boolean equals(Object obj) {
      if (obj instanceof TestNodeHandle) {
        return ((TestNodeHandle) obj).id.equals(id);
      }

      return false;
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @return DESCRIBE THE RETURN VALUE
     */
    public int hashCode() {
      return id.hashCode();
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param m DESCRIBE THE PARAMETER
     */
    public void receiveMessage(Message m) {
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param o DESCRIBE THE PARAMETER
     * @return DESCRIBE THE RETURN VALUE
     */
    public int compareTo(Object o) {
      return id.compareTo(((TestNodeHandle) o).id);
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @return DESCRIBE THE RETURN VALUE
     */
    public String toString() {
      return id.toString();
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param buf DESCRIBE THE PARAMETER
     * @exception IOException DESCRIBE THE EXCEPTION
     */
    public void serialize(OutputBuffer buf) throws IOException {
      throw new RuntimeException("not implemented.");
    }
  }
}