Hi!
> 1. Will like to know which rule gets triggered each time. Since there
> could be more than one rules which meet the requirement. My java application
> will need to know specifically which rule was triggered and at what
> sequence.
This sounds pretty procedural to me. Why would you need to know that?
Anyway, you can install a JessListener listening to rule firings:
// Make Rete engine fire the DEFRULE_FIRED event
int mask = rete.getEventMask() | JessEvent.DEFRULE_FIRED;
rete.setEventMask(mask);
// Install JessListener
rete.addJessListener(new MyRuleListener());
See also:
Rete::getEventMask() : int
Rete::setEventMask() : void
JessEvent
JessListener
> 2. When no rule gets triggered, my java application will result in a
> "hang" mode waiting for something to happen. Is there a work around?
The Rete.run() method returns the number of rules that have been fired. You could
check if the return value is zero. In that case you'd know that no rules have been
fired.
> 3. I understand that I can instantiate object using the Jess scripts. I'm
> wondering if I can pass the reference of an object instance if rules are
> loaded through an Java Application?
There are different possibilties to pass an object reference to the Java application:
(1) store and fetch, and (2) global variables. Using store and fetch you'd do the
following:
Jess language:
(store MY_KEY (new MyObject))
Java:
Context context = rete.getGlobalContext();
MyObject o = rete.fetch("MY_KEY").externalAddressValue(context);
See also:
(store <string-or-atom> <expression>
(fetch <string-or-atom>)
Rete::store(String, Object) : Value
Rete::store(String, Value) : Value
Rete::fetch(String) : Value
Hope that helped.
Thomas
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