[rules-users] missing parameters in the fact object

[Edson Tirelli]

   Agenda groups control only the firing of the rules, not the evaluation.
All the evaluation is eagerly executed as usual in Rete algorithm.

   []s
   Edson

2008/2/5, Jai Vasanth <jaivasanth at gmail.com>:
>
> Hi,
>
>   I am using agenda groups to  pick sets of rules to fire based on an
> attribute value. The presence or absence of other attributes  is dependent
> on the value of this attribute based on which I select  a particular agenda
> group.
>
> Here is an example
>
> rule "ABC"
>   when
>     Shape( type = "rectangle" )
>   then
>     drools.setFocus("twodimensional")
> end
>
>
> rule "PQR"
>   when
>     Shape( type = "cube" )
>   then
>     drools.setFocus("threedimensional")
> end
>
> rule "area threshold"
> agenda-group "twodimensional"
>   when
>     Shape( area > 20 )
>   then
>     System.out.println ("large object" );
> end
>
> rule "volume threshold"
> agenda-group "threedimensional"
>   when
>     Shape( volume > 20 )
>   then
>     System.out.println ("large object" );
> end
>
>
> Suppose if my shape object is a rectangle, then it wouldnt have the volume
> attribute. In this case when we try to run these rules it would throw a
> NoSuchElementException.
>
> Is there a way to avoid this? Agenda groups help us fire the RHSs
> conditionally, Is there a way by which I can conditionally fire LHS of
> certain sets of rules ?
>
>
> Thanks
>
>
> Jai
>
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>
>


-- 
  Edson Tirelli
  JBoss Drools Core Development
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com
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