what is your expectations on how it should work? (everyone has different
ideas it seems !)
On 4/10/06, Juergen <[EMAIL PROTECTED]> wrote:
>
> I mean
>
> workingMemory.assertObject(new String("A"));
> workingMemory.assertObject(new String("A"));
>
> would currently assert both strings into working memory, whereas if it
> would check not for identityHashCode but with equals, the second assert
> would have no effect.
>
> When during experimentation with rule engines I switched from jess
> (where it is done with equals I think) to drools 2 I first experienced
> problems due to this differences (also did not find much in both engines
> docu), leading to my question if I could customize drools behaviour.
>
> As one can always write a wrapper for drools assertObject to make such
> checks, and lots of other users probably dont need, my request is not
> important.
>
> Juergen
>
>
> Michael Neale wrote:
> > so you mean
> > p1 : Person()
> > p2 : Person()
> > eval ( p1.equals(p2) )
> >
> > (but presumably a shorthand form?)
> >
> >
> >
> > On 4/8/06, Mark Proctor <[EMAIL PROTECTED]> wrote:
> >
> >>We hadn't planned it, not promising anything - but I'll see how things
> >>pan out, may be we will get time.
> >>
> >>Mark
> >>Juergen wrote:
> >>
> >>>ad. Can object equality for assertion be customized?
> >>>Drools 3 still seems to use IdentityMap with System.identityHashCode().
> >>>Is it planned to be customizeable e.g. with equals() in 3.0?
> >>>
> >>>Michael Neale wrote:
> >>>
> >>>>Short answer, not easily with Drools 2. But yes, with Drools 3.
> >>>>
> >>>>On 3/22/06, Juergen <[EMAIL PROTECTED]> wrote:
> >>>>
> >>>>
> >>>>>I recently looked into drools after experimenting with JESS and got a
> >>>>>few questions I could not look up in the drools documentation:
> >>>>>
> >>>>>- Exists a condition to test for non-existence of a matching
> >>>>>object/fact?
> >>>>>-- If yes, how to use it for own domain specific language conditions
> >>>>>
> >>>>>- How is sharing of conditions/nodes between productions implemented
> >>
> >>in
> >>
> >>>>>drools, one of the main benefits of the rete algorithm?
> >>>>>-- How is the equality of conditions defined for java smf? via
> textual
> >>>>>equality of the condition's java code?
> >>>>>-- How can equality of conditions for sharing be defined for domain
> >>>>>specific language conditions?
> >>>>>e.g. Conway's game of life (slightly modified dsl)
> >>>>><rule name="kill the overcrowded">
> >>>>> <conway:cellIsAlive cellName="cell"/>
> >>>>> <conway:cellIsOverCrowded cellName="cell"/>
> >>>>> <conway:killCell cellName="cell"/>
> >>>>></rule>
> >>>>><rule name="kill the lonely">
> >>>>> <conway:cellIsAlive cellName="cell"/>
> >>>>> <conway:cellIsLonely cellName="cell"/>
> >>>>> <conway:killCell cellName="cell"/>
> >>>>></rule>
> >>>>>
> >>>>>The conway:cellIsAlive condition could be shared between these two
> >>>>>productions. Would it?
> >>>>>
> >>>>>- When will the properties map be supported in drools implementation
> >>
> >>of
> >>
> >>>>>JSR 94 javax.rules API?
> >>>>>-- e.g. to be able to set conflict resolver of a rule base and other
> >>>>>settings that can be set via drools native API
> >>>>>
> >>>>>- Can object equality for assertion be customized?
> >>>>>-- Currently, org.drools.util.IdentityMap
> >>>>>(org.drools.reteoo.WorkingMemoryImpl) makes use of
> >>>>>System.identityHashCode(). There seems to be no way to customize
> that,
> >>>>>e.g. make drools use equals() instead, neither via native nor JSR 94
> >>>>>API.
> >>>>>
> >>>>>My apologies if some questions have already been answered in other
> >>>>>postings, I made no thorough search in this newsgroup yet.
> >>>>>
> >>>>>Thanks a lot, Juergen
>
>
