1:48 a.m.
Hi all,
we are processing events through a Fusion rule base. To be recognized as
such, model classes must be declared as @role(event). We are using a rather
extensive hierarchy of events, all derived from a single abstract class.
Unfortunately, it doesn't seem to be possible to declare just this base
class as an event and have the 'event' role for the others derived from
that.
Is there a way around having to declare each and every single event class
separately?
Thanks
Joerg
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2:08 a.m.
Derived classes should inherit the @role of parent classes... which
version of Drools are you using?
Edson
On Thu, Jul 26, 2012 at 12:48 PM, Joerg Henne <hennejg+nabble(a)googlemail.com
wrote:
Hi all,
we are processing events through a Fusion rule base. To be recognized as
such, model classes must be declared as @role(event). We are using a rather
extensive hierarchy of events, all derived from a single abstract class.
Unfortunately, it doesn't seem to be possible to declare just this base
class as an event and have the 'event' role for the others derived from
that.
Is there a way around having to declare each and every single event class
separately?
Thanks
Joerg
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Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
4:01 p.m.
Thanks for your help, Edson!
We are using drools 5.4.0.Final via maven.
Maybe I am missing something, so here's a quick overview of what we do. We
have a model class ButtonEvent which is derived like this:
ButtonEvent -> ZonedEvent -> VSCPEvent
Then there's a rulebase with something like this:
import test.vscp.VSCPEvent;
import test.vscp.information.ButtonEvent;
declare VSCPEvent
@role( event )
@timestamp( timestamp )
@expires( 1h )
end
declare ButtonEvent
@role( event )
@timestamp( timestamp )
@expires( 1h )
end
rule "Button long pressed"
when
b : ButtonEvent( action == Action.PRESSED )
not( ButtonEvent( action == Action.RELEASED, this after[0s,1s] b ) )
then
...
end
What I would have expected is that the second 'declare' statement to be
unnecessary. However, if I take it away, this is what I get:
java.lang.ClassCastException: org.drools.common.DefaultFactHandle
at
org.drools.base.evaluators.AfterEvaluatorDefinition$AfterEvaluator.evaluateCachedRight(AfterEvaluatorDefinition.java:316)
at
org.drools.rule.constraint.EvaluatorConstraint.isAllowedCachedRight(EvaluatorConstraint.java:80)
at
org.drools.common.SingleBetaConstraints.isAllowedCachedRight(SingleBetaConstraints.java:139)
at org.drools.reteoo.NotNode.assertObject(NotNode.java:133)
at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:141)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:337)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:298)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:888)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847)
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:269)
...
Thanks
Joerg
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8:51 p.m.
Looks like a bug. :( The code to inherit @role event is there, but
apparently there is something else going on:
https://github.com/droolsjbpm/drools/blob/master/drools-core/src/main/jav...
Please open a JIRA with the information bellow.
Edson
On Fri, Jul 27, 2012 at 3:01 AM, Joerg Henne
<hennejg+nabble(a)googlemail.com>wrote:
Thanks for your help, Edson!
We are using drools 5.4.0.Final via maven.
Maybe I am missing something, so here's a quick overview of what we do. We
have a model class ButtonEvent which is derived like this:
ButtonEvent -> ZonedEvent -> VSCPEvent
Then there's a rulebase with something like this:
import test.vscp.VSCPEvent;
import test.vscp.information.ButtonEvent;
declare VSCPEvent
@role( event )
@timestamp( timestamp )
@expires( 1h )
end
declare ButtonEvent
@role( event )
@timestamp( timestamp )
@expires( 1h )
end
rule "Button long pressed"
when
b : ButtonEvent( action == Action.PRESSED )
not( ButtonEvent( action == Action.RELEASED, this after[0s,1s] b )
)
then
...
end
What I would have expected is that the second 'declare' statement to be
unnecessary. However, if I take it away, this is what I get:
java.lang.ClassCastException: org.drools.common.DefaultFactHandle
at
org.drools.base.evaluators.AfterEvaluatorDefinition$AfterEvaluator.evaluateCachedRight(AfterEvaluatorDefinition.java:316)
at
org.drools.rule.constraint.EvaluatorConstraint.isAllowedCachedRight(EvaluatorConstraint.java:80)
at
org.drools.common.SingleBetaConstraints.isAllowedCachedRight(SingleBetaConstraints.java:139)
at org.drools.reteoo.NotNode.assertObject(NotNode.java:133)
at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:141)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:337)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:298)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:888)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847)
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:269)
...
Thanks
Joerg
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Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
11:04 p.m.
After some debugging I was able to shed some light on what causes the
problem, even if I don't fully understand it. The problem is produced by the
event base class, which is declared with @role(event), i.e. (VSCPEvent)
living in a different package than the ButtonEvent. If I move then into the
same package, everything works just fine.
The two package instances are merged in PackageBuilder.mergePackage(...),
but the RuleBuilder still seems to operate on two separate instances, one
with the declarations and Package.isEvent(...) returning true for the
ButtonEvent and the other without them. Unfortunately, as I know too little
about the workings of the various builders, I can't provide you with a
ready-made idea of how to fix the problem.
See https://issues.jboss.org/browse/JBRULES-3587
Thanks
Joerg
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11:53 p.m.
I had the same strange problem some time ago (last winter), but I never managed to
reproduce a small sample....
I checked, and my problematic class hierarchy also lived in different packages (and never
tried that that for my smaller samples) .
----- Mail original -----
De: "Joerg Henne" <hennejg+nabble(a)googlemail.com>
À: rules-users(a)lists.jboss.org
Envoyé: Lundi 30 Juillet 2012 16:04:50
Objet: Re: [rules-users] Apply role to whole class hierarchy
After some debugging I was able to shed some light on what causes the
problem, even if I don't fully understand it. The problem is produced by the
event base class, which is declared with @role(event), i.e. (VSCPEvent)
living in a different package than the ButtonEvent. If I move then into the
same package, everything works just fine.
The two package instances are merged in PackageBuilder.mergePackage(...),
but the RuleBuilder still seems to operate on two separate instances, one
with the declarations and Package.isEvent(...) returning true for the
ButtonEvent and the other without them. Unfortunately, as I know too little
about the workings of the various builders, I can't provide you with a
ready-made idea of how to fix the problem.
See https://issues.jboss.org/browse/JBRULES-3587
Thanks
Joerg
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http://drools.46999.n3.nabble.com/Apply-role-to-whole-class-hierarchy-tp4...
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4:42 p.m.
Vincent,
this issue seems to be fixed as per
https://issues.jboss.org/browse/JBRULES-3587
Thanks
Joerg Henne
2012/8/6 Vincent LEGENDRE <vincent.legendre(a)eurodecision.com>
I had the same strange problem some time ago (last winter), but I
never
managed to reproduce a small sample....
I checked, and my problematic class hierarchy also lived in different
packages (and never tried that that for my smaller samples).
------------------------------
*De: *"Joerg Henne" <hennejg+nabble(a)googlemail.com>
*À: *rules-users(a)lists.jboss.org
*Envoyé: *Lundi 30 Juillet 2012 16:04:50
*Objet: *Re: [rules-users] Apply role to whole class hierarchy
After some debugging I was able to shed some light on what causes the
problem, even if I don't fully understand it. The problem is produced by
the
event base class, which is declared with @role(event), i.e. (VSCPEvent)
living in a different package than the ButtonEvent. If I move then into the
same package, everything works just fine.
The two package instances are merged in PackageBuilder.mergePackage(...),
but the RuleBuilder still seems to operate on two separate instances, one
with the declarations and Package.isEvent(...) returning true for the
ButtonEvent and the other without them. Unfortunately, as I know too little
about the workings of the various builders, I can't provide you with a
ready-made idea of how to fix the problem.
See https://issues.jboss.org/browse/JBRULES-3587
Thanks
Joerg
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6 comments
4 participants
participants (4)
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Edson Tirelli -
Joerg Henne -
Jörg Henne -
Vincent LEGENDRE