Hi,
I am trying to implement a Event-Condition-Action Agent using
Jess. Basically, events are mapped into facts that are inserted into a
Jess engine. Several Jess rules correlate the events received and as a
consequence generate another higher level event. This event is
communicated to the Java program embedding the RETE engine through a
UserFunction, namely notifyEvent.
I have managed to get callbacks from Jess, but the problem is that it does
not return me the values of the Jess variables I pass as arguments. For
example, given the following rule in Jess:
(defrule play-classical-music "Rule determining when user wants to listen
classical music"
(presence-event (personID ?userID))
(not (presence-event (personID ~?userID)))
=>
(notifyEvent (play-music-event (user ?userID) (type-music
"classical")))
(printout t "play-music event asserted" crlf))
The Java code receiving the function call is:
public Value call(ValueVector vv, Context context) throws JessException {
// We are expecting parameters on the following form
// (event-name (attribute-name attribute-value)+)
// Print out the contents of the event generated
System.out.println("AGGREGATION EVENT RECEIVED: " +
vv.get(0));
System.out.println("CONTENTS: "+ vv.toString());
}
The results printed out are:
AGGREGATION EVENT RECEIVED: notifyEvent
CONTENTS: (notifyEvent (play-music-event (user ?userID) (type-music
"classical")))
How can I make to receive the value of the variable '?userID' ?
My apologies if the question is too basic. I have been searching in the
mailing list and I haven't managed to find a similar problem.
Regards,
-----
Diego Lopez de Ipina
http://www-lce.eng.cam.ac.uk/~dl231
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