[rules-users] rule with low Salience is fired too early

[Wolfgang Laun]

Actually, your "threshold" rule shouldn't fire at all in a stateless
session, where
everything is evaluated just once, resulting in a fixed set of activations
(and,
at most from these, firings). What you reported, sounds very fishy,
indicating
a bug - I'm not saying where ;-)  Either check with the latest version of
Drools,
or post the minimal code showing the effect.

In a stateFUL session, activations are added to the agenda as soon as they
become manifest, and are removed as soon as a rule's condition fails. So,
a single change could create any number of activations. Ranking within
the agenda is determined by several things, salience being the major
criterion.

The current online version of the documentation deals with these topics in
several
places:
http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/html/ch02.html#d0e240,
http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/html/ch03.html#d0e1797(see
subsection "Sequential Mode"),
http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/html/ch03.html#d0e1560

-W


On Mon, May 18, 2009 at 8:25 PM, David Boaz <davidb at dbmotion.com> wrote:

>
> Thanks Wolfgang,
>
> I understand your answer. But, still I cannot understand why low salience
> on
> the threshold rule was not enough?
> Does drools run all the activations in the agenda in one block, and then
> match the changed facts and create new activations? or does the matching
> happen immediatly after each change?
>
> Thanks again, David
> --
> View this message in context:
> http://www.nabble.com/rule-with-low-Salience-is-fired-too-early-tp23585593p23602875.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
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