Gene,

  I was writing the following reply when I received Tony's response to
your query. His solution of using a predicate is elegant. However, it
won't work for you if you've added the TrackReco processes to the
driver's list. Please also look over the approach that I've outlined
below.

  I use a Reconstruction class to select how many (or which) events I
analyze. I've modified it to also allow selecting events. I've attached
the modified version which includes the following elements and methods:

    static int FirstEvent=1;
    static int LastEvent=1000000;

    static boolean GoodEvent = true;

    public static int getFirstEvent() { return FirstEvent; }
    public static int getLastEvent()  { return LastEvent; }
    public static void setFirstEvent(int first) { FirstEvent = first; }
    public static void setLastEvent(int last)   { LastEvent  = last; }

    public static boolean isGoodEvent() { return GoodEvent; }
    public static void setGoodEvent(boolean good) { GoodEvent = good; }

I use it in each process with a line like

    if
(nEvt<Reconstruction.getFirstEvent()||nEvt>Reconstruction.getLastEvent())
return;

However, this version with GoodEvent is not know by the server, and it's
not easy to fool the server unless you're willing to rebuild its code. I
would suggest the following.

  In your main process, TrackJetAna, execute TrackReco's processes. That
is, take out the

        add(new TrackReco());

line in your driver JetFinderTestV5, and in TrackJetAna's constructor
and processor methods add

  public TrackJetAna()
  {
    // Finds tracks in main tracker.
    tracker = new hep.lcd.recon.tracking.tpc.TPCReco();
    // Add reconstructed tracks to event
    addReconTrks = new AddReconTrks(tracker);
    // Turn off track fitting
    addReconTrks.setNoFitting();
    ...
  }

  public void process(LCDEvent event)
  {
    ...
    if (!Reconstruction.isGoodEvent()) return;
    tracker.process(event);
    addReconTrks.process(event);
    ...
  }
  hep.lcd.recon.tracking.Tracker tracker;
  hep.lcd.recon.tracking.AddReconTrks addReconTrks;

It would be more direct to modifiy the base Driver class to check flags
or whatever, but we'll need to review the design after Sitges.

Mike



/* Reconstruction.java */

public class Reconstruction
{
    static int FirstEvent=1;
    static int LastEvent=1000000;

    static boolean GoodEvent = true;

    public static boolean Hist = true;
    public static boolean MCHist = true;
    public static boolean TrkHist = true;
    public static boolean CalHist = true;
    public static boolean PIDHist = true;
    public static boolean EvtHist = true;
    public static boolean AnlHist = true;

    public static int getFirstEvent() { return FirstEvent; }
    public static int getLastEvent()  { return LastEvent; }
    public static void setFirstEvent(int first) { FirstEvent = first; }
    public static void setLastEvent(int last)   { LastEvent  = last; }

    public static boolean isGoodEvent() { return GoodEvent; }
    public static void setGoodEvent(boolean good) { GoodEvent = good; }
}