[rules-users] Listen event in different package

[Wolfgang Laun]

Add two declare ... @role(event) end to listener.drl.

-W

On 11/01/2013, Marco Malziotti <marco.malziotti at trs.it> wrote:
> Hello
> I am a beginner in Drools 5.1.1 and try to listen a event in a packageX
> inserted by a rule in another packageY.
> I have following 2 drl file :
>
> ---inserter.drl----
> package packageY
> import internal.event.*;
>
> declare EventItem
>    @role (event)
> end
>
> rule "insert EventItem"
> when
>    ...
> then
>    EventItem ei = new EventItem(...);
>    insert(ei);
> end
> ----------------
>
> ---listener.drl---
> package packageX
> import internal.event.*;
>
> rule "listen EventItem temporal constraint"
> when
>    ei: EventItem()
>    oi: OtherItem(this after ei)
> then
>    System.out.println("Hello word");
> end
> ----------------
>
> EventItem and OtherItem are defined in 'internal.event' package.
> If I run with a StatefulKnowledgeSession configured in 'pseudo clock',
> I have following stack trace:
>
> java.lang.ClassCastException: org.drools.common.DefaultFactHandle
> cannot be cast to org.drools.common.EventFactHandle
> at
> org.drools.base.evaluators.AfterEvaluatorDefinition$AfterEvaluator.evaluateCachedRight(AfterEvaluatorDefinition.java:322)
> at
> org.drools.rule.VariableRestriction.isAllowedCachedRight(VariableRestriction.java:117)
> at
> org.drools.rule.VariableConstraint.isAllowedCachedRight(VariableConstraint.java:121)
> at
> org.drools.common.SingleBetaConstraints.isAllowedCachedRight(SingleBetaConstraints.java:151)
> at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:125)
> at
> org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
> at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:145)
> at
> org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
> at
> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:190)
> at
> org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:145)
> at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1174)
> at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1123)
> at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:917)
> at
> org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:251)
> ...
>
> Moving listener.drl in packageY, all works.
> I don't know if it is already open a related issue, perhaps the :
> https://issues.jboss.org/browse/JBRULES-2774
> Thanks for your attention.
> Regards.
>
> Marco Malziotti
> Tecnologie nelle Reti e nei Sistemi T.R.S. S.p.A.
> Integration Test Engineer
> Tel.  + 39 06.87281.407
> Fax.  + 39 06.87281.550
> E-mail: marco.malziotti at trs.it
>
>
> Tecnologie nelle Reti e nei Sistemi T.R.S. SpA
> Via della Bufalotta, 378 - 00139 Roma
> Tel +39.06.87.28.1.1 - Fax +39.06.87.28.1.550
>
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