[rules-users] sliding window problems

[will_lauer]

(reposting to a more appropriate list)

I'm starting to expirament with Drools and Drools Fusion and am running into
some problems using sliding windows. I'm using Drools 5.1.1 with a fairly
simple configuration. I have one rule: 

package net.wlauer.DroolsEngine 

import net.wlauer.DroolsEngine.Event 
import java.util.ArrayList 

declare Event 
        @role(event) 
        @expires(30s) 
end 

rule TestWindow 
        when 
                $up : Event (type == "linkup", $inf : extra) 
                $window : ArrayList () from collect ( 
                        Event (extra == $inf) over window:length(2)) 
                $down : Event (type == "linkdown", this before $up) from
$window 
        then 
                channels["up"].send($up); 
end 


I expect this rule to fire whenever it sees a "linkup" event immediately
after a "linkdown" event for the same value of extra. (If you can suggest a
better way to write this, I would appreciate it). My sample program simply
inserts four Events, calling fireAllRules once all the inserts have been
completed. 

What I'm seeing instead of my expected results is the exception: 
Exception in thread "main" java.lang.ClassCastException:
org.drools.common.DefaultFactHandle cannot be cast to
org.drools.common.EventFactHandle 
        at
org.drools.base.evaluators.BeforeEvaluatorDefinition$BeforeEvaluator.evaluateCachedLeft(BeforeEvaluatorDefinition.java:333) 
        at
org.drools.rule.VariableRestriction.isAllowedCachedLeft(VariableRestriction.java:110) 
        at
org.drools.rule.VariableConstraint.isAllowedCachedLeft(VariableConstraint.java:115) 
        at
org.drools.common.SingleBetaConstraints.isAllowedCachedLeft(SingleBetaConstraints.java:142) 
        at
org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:274) 
        at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:138) 
        at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:189) 
        at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:64) 
        at
org.drools.reteoo.AccumulateNode.evaluateResultConstraints(AccumulateNode.java:662) 
        at
org.drools.reteoo.AccumulateNode.assertLeftTuple(AccumulateNode.java:181) 
        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:148) 
        at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59) 
        at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:145) 
        at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:450) 
        at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:368) 
        at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:190) 
        at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:145) 
        at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1174) 
        at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1123) 
        at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:917) 
        at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:251) 
        at
net.wlauer.DroolsEngine.NonSpringRulesEngine.main(NonSpringRulesEngine.java:71) 

>From scanning the list, it looks like this implies that a non-event fact is
being treated as an event-type fact, but I don't see where that could be
happening. Am I doing something obviously wrong? I've tried marking
ArrayList as an event type, but that didn't change the behavior. 

Any insight you can give me would be appreciated. 
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