A Jess definstance is a little more like a 'deffacts' than just
asserting a fact, in that (reset) does not make them go away. To
forget one completely, use (undefinstance) or (retract) (which will
both have the same effect - telling Jess to completely forget about
the Bean. )
My first version of Bean matching in Jess let reset clear all
definstances, and this turned out to be very unintuitive, at least for
me, so I changed the behviour.
I think Kathy Lee Simunich wrote:
>
> I've created a loop in which I read a record from an oracle database,
> create a java bean class, set a variable (which has been defclass'd
> within a jess file). Then I call reset, Funcall (to call the
> definstance
> function to pass in the object), then call run.
>
> My question is: am I using the reset properly? I thought that by
> calling reset, it would erase the previous definstance, so that the
> engine would run only on the current definstance. I put in a (watch
> all),
> and it is showing that I'm collecting all the instances, and the engine
> is firing upon them all each time I call run.
>
> Is there some other way I'm supposed to delete the definstances?
>
> Thanks for any help,
>
> KathyLee Simunich
> Decision & Information Sciences Division
> Argonne National Lab
>
> ----code segment follows-----
>
> for (int i= 0; i < numrecs; i++) {
> ccc = (String)fieldReturns[0].get(i); // field from oracle
> db
>
> // create the bean
> tRec = new TRecord();
> tRec.setCCC(ccc);
>
> // assert the facts, and execute manually.
> try {
> rete.executeCommand("(reset)");
>
> // Tell Jess about the bean
> Funcall f = new Funcall("definstance", rete);
> f.add(new Value("tRec", RU.ATOM));
> f.add(new Value(tRec, RU.EXTERNAL_ADDRESS));
> f.simpleExecute(f, rete.globalContext());
>
> // now run on the new definstance
> rete.executeCommand("(run)");
> } catch (ReteException re) {
> re.printStackTrace(nd.stderr());
> }
> }
>
>
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Ernest Friedman-Hill
Distributed Systems Research Phone: (510) 294-2154
Sandia National Labs FAX: (510) 294-2234
Org. 8920, MS 9214 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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