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(a)alexander-wolf.net&gt; 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 > > > >

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(a)gmail.com&gt; 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(a)alexander-wolf.net&gt; 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(a)alexander-wolf.net&gt; >> 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 >>> >>> >>> >>> >> >> > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users