[rules-users] Drools Flow: Skipping some LHS evaluations attime of insert

[Greg Barton]

And make sure and look at Sequential Mode when you read the docs. (Section 3.3.7.1 in the Drools Expert docs.)  Possibly that is what you're looking for.

--- On Thu, 4/8/10, Swindells, Thomas <TSwindells at nds.com> wrote:

> From: Swindells, Thomas <TSwindells at nds.com>
> Subject: Re: [rules-users] Drools Flow: Skipping some LHS evaluations attime of insert
> To: "Rules Users List" <rules-users at lists.jboss.org>
> Date: Thursday, April 8, 2010, 10:57 AM
> If the aim is purely optimization
> then in that case it won't work (even ignoring the fact you
> haven't told drools you are updating $co).
> Activations are evaluated first then rules are fired. 
> If an activation updates an object then activations are
> recalculated.
> 
> Are you actually having performance problems with drools or
> are you trying to optimize prematurely?
> You seem to be under a misconception  of how drools
> works if you are worried about it trying to match every rule
> against every object and probably need to read up about the
> Rete algorithms and how drools implements it.  http://blog.athico.com/ is a good place to start
> searching through for information and if you want really
> detailed information and advice read chapter 12 of the book
> "Drools JBoss rules 5.0 developer's guide".
> 
> Thomas
> 
> > -----Original Message-----
> > From: rules-users-bounces at lists.jboss.org
> [mailto:rules-users-
> > bounces at lists.jboss.org]
> On Behalf Of madchen
> > Sent: 08 April 2010 16:25
> > To: rules-users at lists.jboss.org
> > Subject: Re: [rules-users] Drools Flow: Skipping some
> LHS evaluations attime
> > of insert
> >
> >
> > Okay so correct me if I'm wrong, but what you're
> suggesting is something like
> > this:
> >
> > rule "1"
> >       when
> >           
>    $v :variable(blah = "matches")
> >           
>    $co : controlObject
> >       then
> >           
>    System.out.println("Yay it matched")
> >           
>    $co.setDoneTrue
> > end
> >
> > rule "2"
> >       when
> >           
>    $v2 :variableTwo(blah = "matches")
> >           
>    $co : controlObject(done != True)
> >       then
> >           
>    //do some stuff
> > end
> >
> > So basically, when the first rule activates and fires,
> it sets the
> > controlObject.done to true and then the second rule
> will not fire because
> > done is true. In this case, it seems that drools will
> run through the tests
> > for each rule and match it against the control
> object.
> >
> > Basically, I'm looking to improve the performance of
> Drools and in my case,
> > if it matches one rule, then there would be no reason
> to check the other
> > ones. Therefore, I'm trying to not have drools check
> every rule against
> > every object.
> > --
> > View this message in context: http://n3.nabble.com/Drools-Flow-Skipping-some-
> >
> LHS-evaluations-at-time-of-insert-tp704324p706256.html
> > Sent from the Drools - User mailing list archive at
> Nabble.com.
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> 
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