FAction

[Fred Wan]

Hi, in some of the java examples I found two different ways of sending a
message to each member in a collection (mostly lists). In the first fragment
below (from SimpleSwarmBug), the method createActionForEach is used to send
a message to each bug in the list. In the second fragment (jheatbugs), a
much more elaborate procedure is used involving the FAction interface. It is
unclear to me what the difference is, and even after studying the reference
guide I have not found out why the second procedure is necessary in this
case. Can someone please elucidate the difference and the necessity of using
FAction?

Thanks,

Fred Wan,
dept. Artificial Intelligence,
Vrije Universiteit Amsterdam,
The Netherlands.

        try {

        sel = new Selector(Class.forName("SimpleBug"), "randomWalk", false);
        modelActions.createActionForEach$message(bugList, sel);

        } catch (Exception e)
        {
        System.err.println("Exception randomWalk: " +
        e.getMessage ());
        System.exit(1);
        }

****************************************************************************
**


 try {
      Heatbug proto = (Heatbug) heatbugList.get (0);
      Selector sel =
        new Selector (proto.getClass (), "heatbugStep", false);
      actionForEach =
        modelActions.createFActionForEachHomogeneous$call
        (heatbugList,
         new FCallImpl (this, proto, sel,
                        new FArgumentsImpl (this, sel, true)));
    } catch (Exception e) {
      e.printStackTrace (System.err);
    }


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