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From: pcb@cacs.usl.edu (Peter C. Bahrs)
Newsgroups: comp.object
Subject: How would you model this situation?
Message-ID: <16734@rouge.usl.edu>
Date: 17 Oct 90 16:26:26 GMT
Sender: anon@rouge.usl.edu
Organization: The Center for Advanced Computer Studies, USL
Lines: 28

The Domain: Object-oriented with concurrency if needed, objects have
     local state, behaviors

The Problem:
  Model an application where two things(people) ara each applying a 
force(pulling) on another thing (ends of a rope).  The acted upon
thing (the rope) breaks.

So suppose I tell person1 to pull X amount.  Should I model all of
the interactions at an application level and then send the rope and 
person2 reactionary messages.  Or should person1, who knows about a
rope (globally) tell the rope to adjust it self, which in turn must
tell person2 to adjust hisself.  So if the rope breaks, how are the
references in person1 and person2 updated?  Does the existing rope
references become forwarders to new part-rope objects?  In summary,
are interactions managed external to objects or should this be
migrated inside the objects.

Please post responses to the net.

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| Peter C. Bahrs                                                         |
| The USL-NASA Project                                                   |
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