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

[Thierry B]

Ha ok, thanks :-)


Edson Tirelli-3 wrote:
> 
>     Michael is right. It is just harder to explain than to do it. Just
> take
> a look at agenda-groups or ruleflow-groups. Chose which one you prefer to
> use it, place your rules in two separate groups: A and B.
> 
>     If using agenda-groups, set initial focus to A, fireAllRules and make
> sure that on the consequence of one of the rules from group A you set
> focus
> to B. So if that rule never fires, B will never have the focus and will
> never fire. Just remeber that agenda-groups work like a stack, so if you
> want ALL rules from A to execute before B, add the setFocus on the rule
> with
> the lowest salience in A.
> 
>     Using ruleflow-groups is similar, but you draw your "flow"
> graphically,
> and it does not work like a stack. Sometimes easier for your use case.
> 
>     []s
>     Edson
> 
> 2009/1/21 Anstis, Michael (M.) <manstis1 at ford.com>
> 
>> 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 at lists.jboss.org
>> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Thierry B
>> Sent: 21 January 2009 12:53
>> To: rules-users at 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
>> >
>> >
>>
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> 
> 
> 
> -- 
>  Edson Tirelli
>  JBoss Drools Core Development
>  JBoss, a division of Red Hat @ www.jboss.com
> 
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