0 Replies Latest reply on Jul 7, 2011 10:45 PM by rp2

    Temporal reasoning with external persistence not working

    rp2
    rp2 Jul 7, 2011 10:45 PM

      I am trying to use an external storage for loading and persisting objects. But when I try a set a temporal reasoning rule it start to fail. The rule, test code and exception are given below. Please help

       

       

      // rules file

       

      {code}
      package foo.externalwm;
       
      global foo.ExternalStorage session;
      import foo.externalwm.YUser
      import foo.externalwm.Test
       
       
      declare User 
          @role(event) 
      end
       
      declare Contest 
          @role(event) 
      end
       
       
      rule "test" 
      dialect "java"
      when 
          $c1:Contest() from session.getContestByName("Contest1")
          User(this after[0,3m] $c1) from session.getUserByIndex(0)
      then
          System.out.println("rule fired");
      end 
       
      {code}
       

       

      // ************ code

       

      {code}
      public class Test {
       
          public static void main(String[] args) throws Exception {
              KnowledgeBaseConfiguration config = KnowledgeBaseFactory.newKnowledgeBaseConfiguration(); 
              config.setOption( EventProcessingOption.STREAM ); 
       
              KnowledgeBase k = init(); // read and compile rules done here
       
              final StatefulKnowledgeSession ksession = k.newStatefulKnowledgeSession();
       
              ExternalStorage session = new ExternalStorage();
              ksession.setGlobal("session", session);
              ksession.fireAllRules();        
          }
      {code}
       

       

      ***********EXCEPTION

      Exception in thread "main" org.drools.RuntimeDroolsException: Unexpected exception executing action org.drools.reteoo.ReteooWorkingMemory$WorkingMemoryReteAssertAction@669a4cb

          at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:996)

          at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:730)

          at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:699)

          at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218)

          at foo.externalwm.Test.main(Test.java:55)

      Caused by: java.lang.ClassCastException: org.drools.common.DefaultFactHandle cannot be cast to org.drools.common.EventFactHandle

          at org.drools.base.evaluators.AfterEvaluatorDefinition$AfterEvaluator.evaluateCachedLeft(AfterEvaluatorDefinition.java:332)

          at org.drools.rule.VariableRestriction.isAllowedCachedLeft(VariableRestriction.java:110)

          at org.drools.rule.VariableConstraint.isAllowedCachedLeft(VariableConstraint.java:111)

          at org.drools.common.SingleBetaConstraints.isAllowedCachedLeft(SingleBetaConstraints.java:127)

          at org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:274)

          at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:137)

          at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:189)

          at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:64)

          at org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:279)

          at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:137)

          at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:189)

          at org.drools.reteoo.SingleLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:138)

          at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:141)

          at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)

          at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)

          at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:143)

          at org.drools.reteoo.Rete.assertObject(Rete.java:107)

          at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:260)

          at org.drools.reteoo.ReteooWorkingMemory$WorkingMemoryReteAssertAction.execute(ReteooWorkingMemory.java:343)

          at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:994)

          ... 4 more