MVEL was my first suspect as well, but the same rules in java dialect (just added setters/getters)
produced same exceptions.
Alex
On 04 Nov 2013, at 07:43, Wolfgang Laun <wolfgang.laun at gmail.com> wrote:
> You never know what an expression suffers when it is thrown into
> the MVEL machinery, (Mario's continuing efforts notwithstanding).
> Documentation is sparse...
>
> To be on the safe side, I'd probably have written
>
> rule "count old"
> when
> $le : LastEvent($ev: event )
> $last: Event( this == $ev )
> $old : Event( this before [1ms , 5s] $last )
> then
> System.out.println($old);
> end
>
> -W
>
>
>
>
> On 03/11/2013, Alexander Wolf <mail at alexander-wolf.net> wrote:
>> Okey I got a little further: This works:
>>
>> rule "count old"
>> when
>> $le : LastEvent($ts : event.timestamp)
>> $old : Event(this before [1ms , 5s] $ts)
>> then
>> System.out.println($old);
>> end
>>
>> but then why does this not work ?!
>>
>> rule "count old"
>> when
>> $le : LastEvent($event : event)
>> $old : Event(this before [1ms , 5s] $event.timestamp)
>> then
>> System.out.println($old);
>> end
>>
>> To me this seems to be a bug, that occurs as soon as I set an event as
>> member of a fact (the LastEvent) -> implementing the peephole technique.
>> At least I got it to do what I want...but not as "niceley..." as expected.
>>
>> -
>>
>>
>> On 02 Nov 2013, at 18:11, Alexander Wolf <mail at alexander-wolf.net> wrote:
>>
>>> Drools 5.5.0 + Fusion / stateful session / STREAM mode
>>>
>>> Hi,
>>>
>>> I try to improve my rules using peephole technique (Thanks @W)
>>> I think I got it right, but now I am stuck with a problem.
>>>
>>> I want to keep a reference to my latest inserted event. Problem: the rule
>>> "print old" gives me an Exception (see below).
>>> I think the peephole itself works pretty well, but somehow my Event Object
>>> (POJO with: Date timestamp, int value) is making problems when I try to
>>> use "before". (see marked line, when commenting it out, the rules run
>>> alright)
>>>
>>> dialect "mvel"
>>>
>>> import java.util.Date
>>> import com.testmodel.Event
>>>
>>>
>>> //declarations
>>> declare Event
>>> @role(event)
>>> @timestamp( timestamp )
>>> end
>>>
>>> declare LastEvent
>>> event: Event
>>> end
>>>
>>>
>>> rule "init"
>>> when
>>> //once...
>>> then
>>> System.out.println("init");
>>> LastEvent l = new LastEvent();
>>> Event e = new Event();
>>> e.timestamp = new Date();
>>> e.value = 0;
>>> l.event = e;
>>> insert(l);
>>> end
>>>
>>> rule "update LastEvent"
>>> no-loop
>>> salience 99
>>> when
>>> $event : Event()
>>> $last : LastEvent()
>>> then
>>> System.out.println("update LastEvent");
>>> retract ($last)
>>> LastEvent l = new LastEvent();
>>> l.event = $event;
>>> insert(l);
>>> end
>>>
>>>
>>> rule "count old"
>>> when
>>> LastEvent($last : event)
>>> $old : Event(this before [0 , 5s] $last) //<<<<<<<<<< THIS IS EVIL?!
>>> then
>>> System.out.println($old);
>>> end
>>>
>>> My test code looks like this:
>>>
>>> Event event = new Event(new Date(), 1);
>>> ksession.insert(event);
>>> ksession.fireAllRules();
>>>
>>> //sleep 1+ sec
>>> Thread.sleep(1001);
>>>
>>> Event event2 = new Event(new Date(), 2);
>>> ksession.insert(event2);
>>> ksession.fireAllRules();
>>>
>>>
>>> And this is the Exception I get:
>>>
>>> Exception executing consequence for rule "init" in testEasierLife: [Error:
>>> drools.insert(l): com.testmodel.Event cannot be cast to java.lang.Number]
>>> [Near : {... System.out.println("init"); ....}]
>>> ^
>>> [Line: 1, Column: 1]
>>> at
>>> org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
>>> at
>>> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)
>>> at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)
>>> at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)
>>> at
>>> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
>>> at
>>> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
>>> at
>>> org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
>>> at com.Test.test(PeepholeTest.java:65)
>>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>> at
>>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>>> at
>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>> at java.lang.reflect.Method.invoke(Method.java:597)
>>> at
>>> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
>>> at
>>> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
>>> at
>>> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
>>> at
>>> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
>>> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
>>> at
>>> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
>>> at
>>> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
>>> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
>>> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
>>> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
>>> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
>>> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
>>> at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
>>> at
>>> org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
>>> at
>>> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
>>> at
>>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
>>> at
>>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
>>> at
>>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
>>> at
>>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
>>> Caused by: [Error: drools.insert(l): com.testmodel.Event cannot be cast to
>>> java.lang.Number]
>>> [Near : {... System.out.println("init"); ....}]
>>> ^
>>> [Line: 1, Column: 1]
>>> at
>>> org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:416)
>>> at
>>> org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:143)
>>> at org.mvel2.ast.ASTNode.optimize(ASTNode.java:159)
>>> at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:115)
>>> at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
>>> at
>>> org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:123)
>>> at
>>> org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:119)
>>> at
>>> org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:113)
>>> at org.mvel2.MVEL.executeExpression(MVEL.java:930)
>>> at
>>> org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:104)
>>> at
>>> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
>>> ... 29 more
>>> Caused by: java.lang.reflect.InvocationTargetException
>>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>> at
>>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>>> at
>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>> at java.lang.reflect.Method.invoke(Method.java:597)
>>> at
>>> org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:1104)
>>> at
>>> org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:987)
>>> at
>>> org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:377)
>>> ... 39 more
>>> Caused by: java.lang.ClassCastException: com.testmodel.Event cannot be
>>> cast to java.lang.Number
>>> at
>>> org.drools.base.evaluators.BeforeEvaluatorDefinition$BeforeEvaluator.evaluateCachedLeft(BeforeEvaluatorDefinition.java:337)
>>> at
>>> org.drools.rule.constraint.EvaluatorConstraint.isAllowedCachedLeft(EvaluatorConstraint.java:67)
>>> at
>>> org.drools.common.SingleBetaConstraints.isAllowedCachedLeft(SingleBetaConstraints.java:125)
>>> at org.drools.reteoo.JoinNode.propagateFromLeft(JoinNode.java:105)
>>> at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:95)
>>> at
>>> org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:196)
>>> at
>>> org.drools.reteoo.SingleLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:145)
>>> at
>>> org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:154)
>>> at
>>> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
>>> at
>>> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
>>> at
>>> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
>>> at
>>> org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
>>> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)
>>> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311)
>>> at
>>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)
>>> at
>>> org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:192)
>>> at
>>> org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:186)
>>> ... 46 more
>>>
>>>
>>>
>>>
>>
>>
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