RE: [rules-users] Run a set of rules in a group B from a rule in agroup A

Hi, See below. "executing a rule" is really two parts: LHS pattern matching (which can't be stopped for a given RuleBase) and execution of the RHS (which can be controlled by the agenda and truth maintenance). I hope my time away hasn't led to me giving wrong advice. Mike -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Thierry B Sent: 21 January 2009 12:53 To: rules-users(a)lists.jboss.org Subject: RE: [rules-users] Run a set of rules in a group B from a rule in agroup A Hello, So if I've well understand : - before calling fireAllRules(), Drools know for all rules (from any group) definied in DRL files, those which all patterns in the LHS of a rule are matched, and those rules are placed on a agenda. At which moment exactly, Drools verified from a rule that all of its pattern in the LHS are matched, if it's before callling fireAllRules() ? >>> Yes, LHS is evaluated on workingMemory.insert(o). A call to fireAllRules() executes the activations on the agenda (i.e. RHS queued as a consequence of LHS being matched on workingMemory.insert(o)). - And fireAllRules() permit to execute all rules that are placed on agenda >>> Yes - When using setFocus() from a java class or a rule, we can control the order of rules to specify to execute rules from group B, and group C... >> I believe so. - So it's not possible to tell Drools that we don't want to execute a group of rules if a rule A is not matched : in that group of rules : those which all paterns match LHS will be inevitably executed. >>> Wrong. The rules won't be executed (read as activations - RHS - won't be run) but you can't stop the LHS being evaluated. All these points that I said, are exact? Thanks :-) Anstis, Michael (M.) wrote: > > Please accept that my knowledge is based on 4.x and there might be other > alternatives in 5. > > Rules are not "ran" but their patterns (LHS) evaluated as facts > (objects) are inserted into Working Memory. When all patterns in the LHS > of a rule are matched activations are placed on the agenda for execution > of the consequence (RHS) when fireAllRules() is called (or other > mechanisms to run what is on the agenda are invoked; such as RuleFlow). > So you could have rules in Group A cause Group B to receive the focus > but it is the RHS's execution order you control and not the pattern > matching - which will happen for Group A and Group B when facts are > inserted into WM. > > Look at Agenda Groups and RuleFlow. This should help. > > With kind regards, > > Mike > > -- View this message in context: http://www.nabble.com/Run-a-set-of-rules-in-a-group-B-from-a-rule-in-a-g roup-A-tp21580767p21582595.html Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users