[EMAIL PROTECTED] wrote:
>
> I think Alan Moore wrote:
> [Charset iso-8859-1 unsupported, filtering to ASCII...]
> > Greetings,
> >
> > This is going to sound really dumb...
> >
>
> > I have a SimpleBean that has two properties property1 and
> > property2. I also have two rules each matching one of the
> > properties.
> >
> > When one of the properties changes, both rules fire even though only
> > one pattern has a reference to the changed property slot.
> >
> > Has Jess always worked this way or has this behavior changed
> > recently?
>
> Jess has always worked this way. Beans are exactly like Facts, which
> behave exactly as they did in CLIPS. We've talked about changing this
> behavior, and that might happen, but it wouldn't be free. Either facts
> would have to change, too, or you'd lose some of the nice symmetry
> that exists now. It's too radical of a change to be a runtime option.
>
> Of course, every time I say something like this in public, the next
> day I think of a way to do it anyway...
I'd favor this a lot ... maybe a concept might be to map Java beans not
to facts but rather to some kind of 'objects' (as COOL in Clips, which
*do* behave as desired, i.e.
here a rule fires only if any of the involved object properties has
changed, real facts instead behave as in Jess).
Maybe you could even adopt the Clips syntax ...
(defrule fire-fact
(templ-fact (slot ?a) ...)
=>
)
and
(defrule fire-fact
(object (is-a templ-obj) (slot ?a) ...)
=>
)
where 'templ-fact' is a deftemplate and 'templ-obj' a defclass.
Of course this would require major user Jess code modifications, unless
maybe you accept both formats above, and switch the behavior depending
on the flavor - the first rule fires with the current policy (if *any*
slot of the fact/bean changes), the latter with the alternate policy.
This way you could have both and would be even backward compatible.
Regards,
tge
> ---------------------------------------------------------
> 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
>
> --------------------------------------------------------------------
> To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]'
> in the BODY of a message to [EMAIL PROTECTED], NOT to the list
> (use your own address!) List problems? Notify [EMAIL PROTECTED]
> --------------------------------------------------------------------
--
........................................................
Thomas Gentsch
--------------
Phone: +49 711 486948 E-mail: [EMAIL PROTECTED]
Mobil: +49 173 6620507 WWW: www.e-tge.de
Fax: +49 711 4687889 www.blue-elephant-systems.com
........................................................
--------------------------------------------------------------------
To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]'
in the BODY of a message to [EMAIL PROTECTED], NOT to the list
(use your own address!) List problems? Notify [EMAIL PROTECTED]
--------------------------------------------------------------------
