[rules-users] Working Memory and agenda-group

[Mauricio Salatino]

Agenda-groups segment the agenda and not the working memory :)
Probably that is part of your confusion.


2011/12/29 Mike Key <mikey at zenbitz.com>:
> I am a fairly new Drools user and am trying to understand how working memory
> is segmented when using agenda groups.  I have an agenda-group that has
> focus set immediately from the session as follows with a few objects being
> inserted:
>
> ksession.insert(objectA);
> ksession.insert(objectB);
> ksession.getAgenda().getAgendaGroup("Foo").setFocus();
>
> I have 2 rules simplified down to illustrate my confusion.  The first rule
> simply sets some default values evaluated in the second rule if objectA
> exists.  In the example that works I set the defaults in the RHS explicitly.
>  However I want to use these defaults from different agenda-groups, so when
> I put them in a function, the second rule never fires, the activation is
> created for the first rule but never the second.  Can someone tell me why
> the use of a function seems to alter the truth of the rule?
>
> THIS WORKS:
>
> declare SomeDefault
>   minValueA : Integer
>   minValueB : Double
>   maxValueB : Double
> end
>
> rule "Check Object A and Set Default"
>   agenda-group "Foo"
>   salience 100
>   when
>     $a : ObjectA()
>   then
>     default = new SomeDefault()
>     default.minValueA = 100
>     default.minValueB = 20.0
>     default.maxValueB = 20000.0
>     insert(default)
> end
>
> rule "Use the defaults"
>   agenda-group "Foo"
>   salience 100
>   when
>     $default : SomeDefault()
>   then
>     System.out.println("Default minA=" + $default.minValueA)
> end
>
> THIS DOES NOT WORK:
>
> declare SomeDefault
>   minValueA : Integer
>   minValueB : Double
>   maxValueB : Double
> end
>
> rule "Check Object A and Set Default"
>   agenda-group "Foo"
>   salience 100
>   when
>     $a : ObjectA()
>   then
>     insertDefault(drools.getWorkingMemory())
> end
>
> rule "Use the defaults"
>   agenda-group "Foo"
>   salience 90
>   when
>     $default : SomeDefault()
>   then
>     System.out.println("Default minA=" + $default.minValueA)
> end
>
> function void insertDefault(WorkingMemory workingMemory) {
>   SomeDefault default = new SomeDefault();
>   default.setMinValueA(100);
>   default.setMinValueB(20.0);
>   default.setMaxValueB(20000.0);
>   workingMemory.insert(default);
> }
>
> In the latter (non-working) example the first rule activates and then drools
> returns, it never even attempts to try to fire the second rule.  However in
> the working example BOTH rules fire as I would expect.  I am guessing this
> is a simple misunderstanding on my part.  Any assistance in understanding
> why this nuance doesn't seem to work would be greatly appreciated.
>
> Thanks.
>
> MiKey
>
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