[rules-users] Temporal reasoning with external persistence not working

[Aman Teja]

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

 


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

 


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();        
    }

 

 

 

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

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

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