RE: Finding events at a particular time in a Schedule

[Tee Toth-Fejel]

> -----Original Message-----
> From: address@hidden [mailto:address@hidden
> Sent: Thursday, September 21, 2000 9:52 PM
> To: address@hidden
> Subject: Re: Finding events at a particular time in a Schedule
>  
> >>>>> "TTF" == Tee Toth-Fejel <address@hidden> writes:
> 
> TTF>    swarm.collections.StringImpl strc = new StringImpl(getZone());
> TTF>    System.out.println("DUMP SCHEDULE at " + 
> Globals.env.getCurrentTime());
> TTF>    schedule.describeForEach(strc);
> TTF>    System.out.println(strc.getC());
> TTF>    strc.drop();
> 
> Huh?  `strc' does nothing here.
> 
> TTF> But what if I don't care about the past, i.e. events 
> scheduled before
> TTF> Globals.env.getCurrentTime())?
> 
> A Schedule is a kind of Map.  You can traverse it with a 
> MapIndex, i.e. by using begin:.

I assume that you mean something like:

    System.out.println("dumpSchedule: begin="+schedule.begin(
                this.getZone()).getCollection().toString());
    Index sheduleIndex = schedule.begin(this.getZone());
    System.out.println("dumpSchedule: sheduleIndex="+sheduleIndex);
    System.out.println("dumpSchedule: sheduleIndex="+
                        sheduleIndex.getName().toString());
    Object next = null;
    System.out.println("dumpSchedule: first next="+sheduleIndex.next());
    while(next != null)
      {
      System.out.println("dumpSchedule: next="+sheduleIndex.next());
      }

But it results in:

dumpSchedule: address@hidden
dumpSchedule: address@hidden
dumpSchedule: sheduleIndex=swarm.collections.MapIndexImpl
Internal error: caught an unexpected exception.
Please check your CLASSPATH and your installation.
java/lang/NullPointerException
      0 [sig] Kaffe 1129 stackdump: Dumping stack trace to
Kaffe.exe.stackdump

$ less Kaffe.exe.stackdump
60006709 [sig] Kaffe 1129 sig_send: wait for sig_complete event failed, sig
11, rc 258, Win32 error
0
60008381 [main] Kaffe 1129 sig_send: wait for sig_complete event failed, sig
6, rc 258, Win32 error
0

Two questions: 
1.  Why can't I do a .next on the MapIndexImpl I got from my schedule?
2.  In general, how does one debug such a stackdump?  
     There seems to be no useful information here.  sig 6?  rc 258?

Thanks for any help that you can give.

In the meantime, I wrote a parser that does what I want (builds a HashMap of
Lists that contain actions in the schedule, which I can then search for
events at a particular time), but it also crashes for unknown reasons,
though half the time.

// UGLY!  UGLY! UGLY! But indexing methods cause a stackdump.
  public HashMap parseSchedule()
    {
    String token;
    int count = 0;
    int sub = 0;
    String time, method;
    boolean multiple = false;
    boolean first = true;
    HashMap actions = new HashMap();
    Vector subactions = new Vector();

    // Possible states are: multiple or single; first or next
    swarm.collections.StringImpl strc = new StringImpl(getZone());
    System.out.println("parseSchedule:  Begin at " +
Globals.env.getCurrentTime());
    schedule.describeForEach(strc);
    StringTokenizer parser = new StringTokenizer(strc.getC()," \n");
    try
      {
      while (parser.hasMoreTokens())
        {
        token = "";
        token = parser.nextToken();
        System.out.println("\n--------Reading *"+token+"*");
        if (token.equals("time:"))
          {
          time = parser.nextToken();
          count = new Integer(time).intValue();
          System.out.print("\n Time: "+count+" ");
          first = true;
          }
        else if (token.equals("concurrentGroup:"))
          {
          multiple = true;
          System.out.print("Concurrent ");
          }
        else if (token.equals("]"))   // must do this before checking for
"method]"
          {
          multiple = false;
          System.out.print("Single ");
          }
        else if
(token.substring(0,Math.min(token.length(),10)).equals("ActionTo_c"))
          {
          //multiple = false;
          System.out.print("Single ");
          }
        else if (token.endsWith("]"))
          {
          method = token.substring(0,token.length()-1);
          if (multiple == true)
              {
              if (first == true)
                {
                  subactions = new Vector();
                  System.out.print("first ");
                  System.out.print("subactions="+subactions);
                  subactions.addElement(method);
                  actions.put(new Integer(count), subactions);
                  first = false;
                }
              else
                {
                subactions.addElement(method);
                System.out.print("next ");
                }
              }
          else
              {
              actions.put(new Integer(count), method);
              }
          System.out.print("Method: "+method+" ");
          }
        else if (token.equals("GUISwarm")) {;}
        else if (token.equals("is:")) {;}
        else if (token.equals("at")) {;}
        else if (token.equals("action")) {;}
        else
          {
 
System.out.print("substring="+token.substring(0,Math.min(token.length(),10))
);
          System.out.println("Else "+count+"."+sub+" "+token);
          ;
          }
        }
      }
    catch (Exception e)
      {
      e.printStackTrace();
      }
    strc.drop();
    return actions;
    }


public int getTimeOfNextEvent(int now)
      {
      HashMap scheduledActions;
      int next = now;
      boolean after = false;

      //System.out.println("getTimeOfNextEvent:"+ now +". Start.");
      scheduledActions = parseSchedule();
      Set keys = scheduledActions.keySet();
      Iterator keysIterator = keys.iterator();
       for (Iterator i = keys.iterator(); i.hasNext(); )
            {
            Integer timeOfActionI = (Integer) i.next();
            int timeOfAction = timeOfActionI.intValue();
            if (timeOfAction< now)
                {
                //System.out.println(timeOfAction+"<"+now);
                ;
                }
            else if (timeOfAction == now)
                {
                //System.out.println(timeOfAction+"="+now);
                ;
                }
            else
                {
                //System.out.println(timeOfAction+">"+now);
                after = true;
                return timeOfAction;
                }
                  }
      return now;
      }


Tihamer "Tee" Toth-Fejel                    Member of Technical Staff
(734) 623-2544   address@hidden      http://www.anteaters.net/ttf/  
Center for Electronic Commerce, Environmental Research Institute of Michigan




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