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