thanks, Ernest
Gang
>From: [EMAIL PROTECTED]
>Reply-To: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: Re: JESS: exit from jess
>Date: Thu, 1 Aug 2002 17:21:23 -0700 (PDT)
>
>I think Gang Liu wrote:
> >
> > hi, all
> > I am using half Java and half Jess script together to address our tasks
>and
> > main() is writted by myself. I am wonder how jess returns control to
>Java.
> >
> > When we call executeCommand("(run)") from main(), the program control is
> > passed to Jess. How does Jess return control to Java? 1way I know is
>after
> > Jess inference engine finishes check all facts ,rules and fire rules, it
> > will return control to main(). Any other ways?
>
>run() returns only when the engine stops running. This can be when
>there are no more rules to fire, or when some rule calls
>(halt). Alternatively, you can use run() with a numeric argument; then
>you'll get control back as soon as either that many rules have fired,
>or there are no more rules to fire. So you can use this as your
>program's "event loop:"
>
>while (true) {
> engine.run(3);
> doMyOwnThing();
>}
>
>Finally, you can use runUntilHalt(), which doesn't return even if
>there are no rules to fire. Typically this function is called in its
>own thread; then your main routine never loses control at all.
>
> >
> > I found a fuction (exit). When (exit) is called, it seems to stop Java
>VM,
> > so main() is stopped also. what I hope is that Jess stops and return
>control
> > to main().
>
>The definition for (exit) says "Exits Jess and halts Java." It just
>calls System.exit(0).
>
>The definition for (halt) says "Halts rule execution. No effect
>unless called from the RHS of a rule. " This is the function you're
>looking for.
>
> >
> > BTW, In which file can I find the source code for (exit)? no
>Intinsics.java?
> > we have multifunctions.java ...
> >
>
>The functions marked "Intrinsic" are defined in
>jess/Funcall.java. (exit) is defined in class "HaltEtc" in that file.
>
>
>---------------------------------------------------------
>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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