It works now (I get a StatefulKnowledgeSessionImpl back which is fine). Thanks for fixing this.<br><br><div class="gmail_quote">On Sun, Mar 8, 2009 at 4:43 AM, Mark Proctor <span dir="ltr"><<a href="mailto:mproctor@codehaus.org" target="_blank">mproctor@codehaus.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000"><div>
Mark Proctor wrote:
<blockquote type="cite">
Michal Bali wrote:
<blockquote type="cite">Hi,<br>
<br>
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 <b>null</b> back.<br>
</blockquote>
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.<br>
</blockquote></div>
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<div><div></div><div><br>
<a href="https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/" target="_blank">https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/</a><br>
</div></div><blockquote type="cite"><div><div></div><div>
<blockquote type="cite"><br>
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):<br>
<br>
org.drools.runtime.rule.ConsequenceException:
java.lang.ClassCastException: <b>org.drools.reteoo.</b><b>ReteooWorkingMemory
cannot be cast to org.drools.reteoo.</b><b>ReteooStatefulSession</b><br>
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)<br>
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:943)<br>
at
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:885)<br>
at
org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1082)<br>
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:682)<br>
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:659)<br>
at
org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:213)<br>
at com.sample.DroolsTest.main(DroolsTest.java:45)<br>
Caused by: java.lang.ClassCastException:
org.drools.reteoo.ReteooWorkingMemory cannot be cast to
org.drools.reteoo.ReteooStatefulSession<br>
at
org.drools.base.DefaultKnowledgeHelper.getKnowledgeRuntime(DefaultKnowledgeHelper.java:222)<br>
at
com.sample.Rule_Hello_World_0.consequence(Rule_Hello_World_0.java:7)<br>
at
com.sample.Rule_Hello_World_0ConsequenceInvoker.evaluate(Rule_Hello_World_0ConsequenceInvoker.java:26)<br>
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:934)<br>
... 6 more<br>
<br>
for this rule:<br>
rule "Hello World"<br>
when<br>
Message( )<br>
then<br>
System.out.println( drools.getKnowledgeRuntime() );<br>
end<br>
<br>
Best Regards,<br>
Michal<br>
<br>
<br>
<div class="gmail_quote">On Fri, Mar 6, 2009 at 6:45 AM, Mark
Proctor <span dir="ltr"><<a href="mailto:mproctor@codehaus.org" target="_blank">mproctor@codehaus.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000">
<div>David Boaz wrote:
<blockquote type="cite">
<pre>Your answer refered to Statefull session. My question was regarding a
stateless session, that do not extend WorkingMemory.
</pre>
</blockquote>
</div>
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.<br>
<font color="#888888"><br>
Mark</font>
<div>
<div><br>
<blockquote type="cite">
<pre>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:
</pre>
<blockquote type="cite">
<pre>David Boaz wrote:
</pre>
<blockquote type="cite">
<pre>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.
</pre>
</blockquote>
<pre>If you are using StatefulKnowledgeSession. Then the Activation has
Collection< ? extends FactHandle> getFactHandles();
And the KnowledgeRuntime is always available, which extends the
WorkingMemory.
Mkar
</pre>
<blockquote type="cite">
<pre>David
Mark Proctor wrote:
</pre>
<blockquote type="cite">
<pre>David Boaz wrote:
</pre>
<blockquote type="cite">
<pre>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?
</pre>
</blockquote>
<pre>The event listeners don't work in the last release, this is fixed in
trunk, please give it a try in a snapshot:
<a href="https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/" target="_blank">https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/</a>
</pre>
<blockquote type="cite">
<pre>Thanks, David
</pre>
</blockquote>
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