I think Vicken Kasparian wrote:
>
> Funcall f = new Funcall("definstance", rete);
> f.add(new Value("pump", RU.ATOM));
> f.add(new Value(p));
> f.execute(rete.getGlobalContext());
>
> In my application, have thousands of objects that I am working with and they
> are being created and deleted dynamically.
>
> Q1. Do I need to tell Jess about each instance of an object for which I have
> rules for, or can the rules be defined to work for a class of objects?
You have to tell Jess about each object somehow. Of course, you might
be able to make it automatic -- for instance, by doing it in
the class's constructors.
> If yes then do I need to call f = new Funcall("definstance", rete) for each
> instance of an object that I create? (Any limitations or performance issues
> if that is the case?)
You can recycle one Funcall object, if you'd like After the first
execute() call, just replace the one argument that changes -- i.e.,
f.set(new Value(myObject), 2);
and then call execute again. See docs/api/jess/ValueVector.html for
the set() function.
>
> Q2. Is there an explanation somewhere about how the LHS of rules match
> patterns for objects defined in a Java code. For example,
> (defrule warn-if-low
> (tank (name ?name) (low TRUE) (intact TRUE))
> "low" and "intact" are not attributes (properties) of tank. How are
> the being used in this rule?
Download and read the Java Beans spec, or buy a book about Java
Beans. "low" and "intact" are indeed Java Bean properties of the Tank class
-- generated from the isLow() and isIntact() member functions.
>
> Q3. Can you have a function call that returns a Boolean on the [LHS] of a
> rule? For example, I would like to check in a rule the existence of an
> object in the Java app's working memory that matches a certain pattern. This
> can be used to do correlation of patterns across multiple instances of
> objects. (If not, any ideas for a workaround??)
I'm afraid I don't understand the example, but to have a boolean test
on the LHS of a rule, use the (test) CE -- see manual section 2.8.1.5.
---------------------------------------------------------
Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9012 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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