Hi,<br><br>I guess the issue is that StatelessKnowledgeSession doesn&#39;t extend the WorkingMemory interface as David pointed out. So if you call event.getKnowledgeRuntime() you&#39;ll get <b>null</b> back.<br><br>Similar issue happens when you call drools.getKnowledgeRuntime() from within rule&#39;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 &quot;Hello World&quot;<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">&lt;<a href="mailto:mproctor@codehaus.org">mproctor@codehaus.org</a>&gt;</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 class="im">
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></div><div class="h5"><br>
<blockquote type="cite">
  <pre>Currently, I did an ugly work-around. The Activation returns a
Collection&lt;FactHandle&gt;, 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&#39;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&lt; ? extends FactHandle&gt; 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&#39;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&#39;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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        </pre>
      </blockquote>
      <pre>  
      </pre>
    </blockquote>
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    </pre>
  </blockquote>
  <pre>  </pre>
</blockquote>
<br>
</div></div></div>

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