[rules-users] Need help with setFocus

[new2drools]

Your "HINT" certainly helped...really really appreciate your help!!


Wolfgang Laun-2 wrote:
> 
> It's impossible to diagnose exactly what goes on without seeing the LHS
> patterns in detail. One possible reason for the rules rule[234] in groupX
> not firing the second time that group is given focus is that none of the
> objects participating in the LHS of the three rules has changed since the
> first time.
> 
> Mixing condition evaluation by pattern matching with explicit control via
> a-groups and the like is tricky and apt to create surprises galore. Try to
> write the LHS so that they fully express the condition for firing; use
> groups only as a last resort.
> 
> Hint: duplication of RHS code can be avoided by defining and calling
> functions.
> 
> -W
> 
> 
> On Wed, Jun 24, 2009 at 4:42 AM, new2drools <rkbeach at gmail.com> wrote:
> 
>>
>> Hi All,
>>
>> Need some help with understanding setFocus.
>>
>> I have the following use case:
>>
>> if (condition1) {
>>
>>  if (condition2) {
>>
>>  } else if (condition3) {
>>
>>  } else if (condition 4) {
>>
>>  }
>>
>> }
>>
>> if (condition5) {
>>
>>  if (condition2) {
>>
>>  } else if (condition3) {
>>
>>  } else if (condition 4) {
>>
>>  }
>>
>> }
>>
>> I created 3 rules (rule2, rule3, rule4) for checking condition2,
>> condition3,
>> condition4 and
>> created 1 agenda group (groupX) for them.
>>
>> I created 2 rules (rule1, rule5) for checking condition1, condition5 and
>> created 1 agenda group(groupY) for them.
>>
>> rule "rule1"
>>  agenda-group "groupY"
>>
>>  when
>>    //
>>  then
>>   drools.setFocus("groupX");
>> end
>>
>> rule "rule3"
>>  agenda-group "groupX"
>>  activation-group "someActiveGroup"
>>
>>  when
>>    //
>>  then
>>   //
>> end
>>
>> >From the java code:
>>
>> ksession.getAgenda().getAgendaGroup("groupY").setFocus();
>>
>> Problem: The first time, drools.setFocus("groupX") is invoked, I see that
>> it's working fine. rule2 or rule3 or rule4 get triggered. But, the SECOND
>> time that drools.setFocus("groupX") is invoked, I don't see that any rule
>> in
>> agenda-group groupX is being invoked...even though one of the rule's LHS
>> explicitly matches...thinking that the activation-group is cancelling all
>> the activation's (after one rule in that activation group is fired), I
>> even
>> removed the activation-group statement. But, it didn't help...ideally, I
>> would like to bunch rule2, rule3, rule4 in one activation group.
>>
>> Can you please let me know as to why the second invocation of setFocus is
>> not working? I even tried to remove everything in LHS of rule2/3/4, to
>> see
>> if the second invocation would work...it doesn't...
>>
>> Thanks!!
>> --
>> View this message in context:
>> http://www.nabble.com/Need-help-with-setFocus-tp24177742p24177742.html
>> Sent from the drools - user mailing list archive at Nabble.com.
>>
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>>
> 
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> 
> 

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