[rules-users] Limiting rule evaluation--not firing

[Swindells, Thomas]

The thing to remember is that fact evaluation occurs at object insert/update time, not at the point you call fireAllRules. Salience, Agenda and rufeflow control on the other hand are runtime conditions which control which rules are actually activated in what order.

Thomas

From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Vincent Legendre
Sent: 21 March 2011 13:34
To: Rules Users List
Subject: Re: [rules-users] Limiting rule evaluation--not firing

And what about ruleflow-group ?
There is no network filtering for that too ? The ruleflow-group behaves like an agenda filter, but still evaluate all nodes ?
Could we imagine setting "tags" to nodes, and stop propagation for node that does not declare the current task tag ?


Le 21/03/2011 14:20, Edson Tirelli a écrit :

   The algorithm as is does eager evaluation, as for the general case that is still better than doing selective evaluation.

   If, in your case, the decision of which rules to fire is an arbitrary application decision, and not based on the actual constraints of the rules themselves, then the only way would be by creating a control fact:

rule 1
when
   ControlFact( phase == Phase.ONE )
...

rule 2
when
   ControlFact( phase == Phase.TWO )
...

   This way, if the control fact is the first pattern in each rule it effectively disables all the beta evaluations for rules of phases other than the current one. Just be aware that by blocking the eager evaluation this way, phase switches are heavier than without the control fact, where most constraints were already previously evaluated. Obvious, but worth saying out loud... :)

   There is also a feature that Leonardo is working on that makes the engine automatically unlink and relink parts of the network, based on the existence and possibility of matching the other required facts in a rule LHS. It might achieve similar results to what you are looking for in some cases, but that is totally based on the constraints in there and not on any arbitrary application decision.

   Edson



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