Mark Proctor wrote:
Michal Bali wrote:
Hi,
I guess the issue is that StatelessKnowledgeSession doesn't extend
the WorkingMemory interface as David pointed out. So if you call
event.getKnowledgeRuntime() you'll get *null* back.
when in an event or in a consequence, whether using a stateless or
stateful session it should return a knowledgeruntime instance - if
it's not, it's a bug. I'll look into it.
I've looked into this and fixed the bug, you should now be able to
access the knowledgeruntime from the consequence and the event. Please
do retest all of this from trunk
https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/
Similar issue happens when you call drools.getKnowledgeRuntime() from
within rule's consequence. However in this case it throws the
following exception (running with snapshot from 07. 03. 2009):
org.drools.runtime.rule.ConsequenceException:
java.lang.ClassCastException:
*org.drools.reteoo.**ReteooWorkingMemory cannot be cast to
org.drools.reteoo.**ReteooStatefulSession*
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:943)
at
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:885)
at
org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1082)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:682)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:659)
at
org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:213)
at com.sample.DroolsTest.main(DroolsTest.java:45)
Caused by: java.lang.ClassCastException:
org.drools.reteoo.ReteooWorkingMemory cannot be cast to
org.drools.reteoo.ReteooStatefulSession
at
org.drools.base.DefaultKnowledgeHelper.getKnowledgeRuntime(DefaultKnowledgeHelper.java:222)
at
com.sample.Rule_Hello_World_0.consequence(Rule_Hello_World_0.java:7)
at
com.sample.Rule_Hello_World_0ConsequenceInvoker.evaluate(Rule_Hello_World_0ConsequenceInvoker.java:26)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:934)
... 6 more
for this rule:
rule "Hello World"
when
Message( )
then
System.out.println( drools.getKnowledgeRuntime() );
end
Best Regards,
Michal
On Fri, Mar 6, 2009 at 6:45 AM, Mark Proctor <[email protected]
<mailto:[email protected]>> wrote:
David Boaz wrote:
Your answer refered to Statefull session. My question was regarding a
stateless session, that do not extend WorkingMemory.
you are using an event, that event exposes the knowledgeruntime
in the event listener - stateless and stateful use the same event
model and both expose the knowledgeruntime as a parameter. All
events should extend KnowledgeRuntimeEvent which provides the
method getKnowledgeRuntime.
Mark
Currently, I did an ugly work-around. The Activation returns a
Collection<FactHandle>, and I noticed that in runtime, the FactHandle is
instanceof InternalFactHandle, that do have a getObject(). So, My code looks
like:
for(FactHandle handle:activation.getFactHandles()){
assert(handle instanceof InternalFactHandle);
Object o=((InternalFactHandle)handle).getObject();
...
}
Im looking for the correct way to implement this functionality.
Thanks, David
Mark Proctor wrote:
David Boaz wrote:
Thanks Mark,
The post bellow doesn't deal with the event listener registration.
Assuming
the registration was solved, now I have another issue. How to retrieve
the
Facts given Fact-handles? In a stateless session, I have no access to the
working memory.
If you are using StatefulKnowledgeSession. Then the Activation has
Collection< ? extends FactHandle> getFactHandles();
And the KnowledgeRuntime is always available, which extends the
WorkingMemory.
Mkar
David
Mark Proctor wrote:
David Boaz wrote:
Hi all,
Im trying to listen to the events fired during the evaluation of a
stateless
session. I implemented org.drools.event.rule.AgendaEventListener. The
events
fire as expected. From the event I can extract the Activation, the Rule
and
the list of FactHandles. Now, from each FactHandle I want to retrieve
the
associated fact (Object). For that, I need a WorkingMemory. But the WM
doesn't participate in the event signature. In addition, since Im using
a
stateless session, the working memory does not exist until I execute()
method.
Can you please help?
The event listeners don't work in the last release, this is fixed in
trunk, please give it a try in a snapshot:
https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/
Thanks, David
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