[JAVA3D] behavior post - delayed delivery

[Peter Warren]

Hello,

I'm wondering if anyone can shed some light on the following behavior for
me.  I've created a test program (below) that creates 3 behaviors.  One
posts a notification, and the other two (what I call ReceivePostBehaviors)
listen for it.  The two ReceivePostBehaviors differ in that one's wakeup
condition is a WakeupOr composed of a WakeupOnBehaviorPost and a
WakeupOnAWTEvent (mouse clicked) (call this behavior #1), and the other's
wakeup condition is simply a WakeupOnBehaviorPost (call this behavior #2).
In the program, I disable the two ReceivePostBehaviors and then have the
PostBehavior post its message.  Then I sleep for 3 seconds and afterwards
enable the two ReceivePostBehaviors.  I would expect the
WakeupOnBehaviorPost sent by the PostBehavior to be lost to both
ReceivePostBehaviors, since both are disabled at the time the PostBehavior
posts.

What instead happens is that when I click on the screen after the 3 seconds
have elapsed, #1 receives the mouse click notification AND the
WakeupOnBehaviorPost from the PostBehavior.  #2 does not receive the
WakeupOnBehaviorPost.  I don't get it.  Why is the WakeupOnBehaviorPost
being queued and delivered later to #1?

Below is the test program.  Also notice that you can click on the screen
before the 3 second wait period has expired, and no WakeupOnAWTEvents are
delivered to #1.  Those messages are lost, why aren't the
WakeupOnPostBehaviors lost as well?

Thanks for any insight,
Peter

// TEST PROGRAM
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.media.j3d.*;
import javax.swing.*;
import javax.vecmath.*;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.universe.*;

public class Test
  extends JFrame
{
  private Behavior receive1;
  private Behavior receive2;
  private PostBehavior post1;

  public static void main(String[] args)
  {
    Test test = new Test();
    test.setVisible(true);
  }

  public Test()
  {
    super();
    GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
    Canvas3D canvas = new Canvas3D(config);
    SimpleUniverse simpleU = new SimpleUniverse(canvas);
    simpleU.getViewingPlatform().setNominalViewingTransform();

    BranchGroup contentBranch = createContentBranch();
    simpleU.addBranchGraph(contentBranch);

    this.getContentPane().setLayout(new BorderLayout());
    this.getContentPane().add("Center", canvas);
    this.setSize(300, 300);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    ExecThread execThread = new ExecThread();
    execThread.start();
  }

  private BranchGroup createContentBranch()
  {
    BranchGroup contentBranch = new BranchGroup();
    TransformGroup tg = new TransformGroup();

    WakeupOnAWTEvent wakeup1 =
          new WakeupOnAWTEvent(java.awt.event.MouseEvent.MOUSE_CLICKED);
    WakeupOnBehaviorPost wakeup2 =
          new WakeupOnBehaviorPost(post1, PostBehavior.ID);
    WakeupCriterion[] criteria = { wakeup1, wakeup2 };
    WakeupOr wakeupOr = new WakeupOr(criteria);
    receive1 = new ReceivePostBehavior(1, wakeupOr);

    WakeupOnBehaviorPost wakeup3 =
          new WakeupOnBehaviorPost(post1, PostBehavior.ID);
    receive2 = new ReceivePostBehavior(2, wakeup3);

    post1 = new PostBehavior();
    Bounds bounds = new BoundingSphere();
    post1.setSchedulingBounds(bounds);
    receive1.setSchedulingBounds(bounds);
    receive2.setSchedulingBounds(bounds);

    // will all be enabled by exec thread
    receive1.setEnable(false);
    receive2.setEnable(false);
    post1.setEnable(false);

    tg.addChild(post1);
    tg.addChild(receive1);
    tg.addChild(receive2);
    contentBranch.addChild(tg);
    return contentBranch;
  }

  private class ExecThread
    extends Thread
  {
    public void run()
    {
      try
      {
        post1.setEnable(true);
        int sleepTime = 3000;
        Thread.sleep(sleepTime);
        System.out.println("slept " + sleepTime);
        receive1.setEnable(true);
        receive2.setEnable(true);
      }
      catch (InterruptedException ie)
      {
        ie.printStackTrace();
      }
    }
  }

  private class PostBehavior
    extends Behavior
  {
    private static final int ID = 1;
    private WakeupCriterion firstFrame;

    private PostBehavior()
    {
      firstFrame = new WakeupOnElapsedFrames(0);
    }

    public void initialize()
    {
      wakeupOn(firstFrame);
    }

    public void processStimulus(Enumeration enumeration)
    {
      System.out.println("posting");
      postId(ID);
    }
  }

  private class ReceivePostBehavior
    extends Behavior
  {
    private int id;
    private WakeupCondition wakeup;

    private ReceivePostBehavior(int id, WakeupCondition wakeup)
    {
      this.id = id;
      this.wakeup = wakeup;
    }

    public void initialize()
    {
      wakeupOn(wakeup);
    }

    public void processStimulus(Enumeration enumeration)
    {
      System.out.println("awoken: " + id);
      while (enumeration.hasMoreElements())
      {
        Object element = enumeration.nextElement();
        System.out.println("wakeup type: " + element);
        if (element instanceof WakeupOnBehaviorPost)
        {
          System.out.println("disabling");
          setEnable(false);
        }
        wakeupOn(wakeup);
      }
    }
  }
}

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