Date arithmetic in when part
by rouvas＠mm.di.uoa.gr
Hi list,
I feel this should be an elementary question but unfortunately I haven't
been able to find a solution.
I would like to perform date arithmetic in the when part of a rule.
For example, I would like to express something like:
rule "Date compare rule"
dialect "mvel"
when
a : A()
b : B( a.creationDate <= b.creationDate after 3 months)
then
...
end
Apart from using eval()'s is there any other way to express these types of
comparisons?
Thank you for your time,
-Stathis
15 years, 1 month
activation dependent of rule order in drl file in 5.2.0.Final?
by Florian Beckmann
Hi,
because of https://issues.jboss.org/browse/JBRULES-2942 i just migrated our
(maven) project to 5.2.0.Final - we depend on salience in some of our rules.
However, after the salience issue was gone I'm facing a new problem in several
test cases:
Rules in previously (drools 5.1.1) working rule files don't get activated
anymore when I insert facts - none at all.
When moving the rule expected to fire (see "rule 4" in attached file) to the
first position in the drl file then suddenly several rules get activated and the
expected rule fires.
This shouldn't be the case, shouldn't it? Or do I miss something obvious here?
Could a corrupt file somehow cause this?
I attachached the rule file which causes the problem (I needed to obfuscate
some names, sry). It is quite simple.
I experienced a similar issue (again since 5.2.0.Final) with rules generated
from templates, where I had to change the constraints order in the templates'
LHS for then generated rules to get activated at all.
First I would like to know if my statement that the rule position in the drl
file shouldn't influence the activation (I don't mean firing or order of
activations) of a rule at all, is correct.
I don't use agenda groups.
And second if someone experienced similar issues.
I will try to build a test case which hopefully can reproduce this as soon as
possible.
Florian
15 years, 1 month
NullPointerException in RightTupleIndexHashTable.remove()
by Weiss, Wolfgang
Hi all!
I encountered that null pointer exceptions occur when retracting an object from the working memory. Sometimes the problem occurs sooner sometimes later but it certainly happens. I think it also depends on the workload on the machine. Sometimes the NPE is thrown in 'LeftTupleIndexHashTable' but mainly in 'RightTupleIndexHashTable'. After the exception is thrown, the object to retract is still in the working memory. When I remove the line 'retract($obj)' in my rule, I don't get an exception.
The problem occurs mainly in this rule, but also in other rules:
rule "remove a cross talk"
agenda-group "evaluation"
activation-group "ag-crossTalk"
lock-on-active true
salience 40
when
$ctf : CrossTalkFact($persID : uniquePersonID, $ctfTimestamp : timestamp)
$pers : AnalysisCue(cueType == AnalysisCue.ACTION_STOP_TALKING, uniquePersonID == $persID, timestamp > $ctfTimestamp) from entry-point "LowLevelCueStream"
then
retract($ctf); //the suspicious line
//... do some other things
end
My configuration:
drools.dialect.java.compiler = JANINO
EventProcessingOption = STREAM
I was able to reproduce the problem with following versions:
5.1.1
5.2.0.M1
5.2.0.CR1
Stack trace from the version: 5.2.0.CR1
org.drools.runtime.rule.ConsequenceException: rule: remove a cross talk
at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:915)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:844)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1055)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:733)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:699)
at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218)
...
Caused by: java.lang.NullPointerException
at org.drools.core.util.RightTupleIndexHashTable.remove(RightTupleIndexHashTable.java:351)
at org.drools.reteoo.NotNode.retractRightTuple(NotNode.java:178)
at org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:235)
at org.drools.reteoo.EntryPointNode.retractObject(EntryPointNode.java:229)
at org.drools.common.NamedEntryPoint.retract(NamedEntryPoint.java:529)
at org.drools.base.DefaultKnowledgeHelper.retract(DefaultKnowledgeHelper.java:226)
at eu.ta2.orchestration.engine.cueLifter.Rule_remove_a_cross_talk_0.defaultConsequence(Unknown Source)
at eu.ta2.orchestration.engine.cueLifter.Rule_remove_a_cross_talk_0DefaultConsequenceInvoker.evaluate(Unknown Source)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:905)
... 31 more
Sometimes the exception occurs in the LeftTupleIndexHashTable:
org.drools.runtime.rule.ConsequenceException: rule: remove a cross talk
at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:915)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:844)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1055)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:733)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:699)
at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218)
...
Caused by: java.lang.NullPointerException
at org.drools.core.util.LeftTupleIndexHashTable.remove(LeftTupleIndexHashTable.java:275)
at org.drools.reteoo.NotNode.retractLeftTuple(NotNode.java:231)
at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateRetractLeftTuple(SingleLeftTupleSinkAdapter.java:212)
at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateRetractLeftTuple(SingleLeftTupleSinkAdapter.java:86)
at org.drools.reteoo.JoinNode.retractLeftTuple(JoinNode.java:210)
at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateRetractLeftTuple(SingleLeftTupleSinkAdapter.java:212)
at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateRetractRightTuple(SingleLeftTupleSinkAdapter.java:119)
at org.drools.reteoo.JoinNode.retractRightTuple(JoinNode.java:192)
at org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:235)
at org.drools.reteoo.EntryPointNode.retractObject(EntryPointNode.java:229)
at org.drools.common.NamedEntryPoint.retract(NamedEntryPoint.java:529)
at org.drools.base.DefaultKnowledgeHelper.retract(DefaultKnowledgeHelper.java:226)
at eu.ta2.orchestration.engine.cueLifter.Rule_remove_a_cross_talk_0.defaultConsequence(Unknown Source)
at eu.ta2.orchestration.engine.cueLifter.Rule_remove_a_cross_talk_0DefaultConsequenceInvoker.evaluate(Unknown Source)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:905)
... 31 more
Any help is appreciated.
Best regards,
Wolfgang
15 years, 1 month
Guvnor guided editor problem - "add more options"
by capeja
Hi all, I'm completely new to Drools and Guvnor and I'm following the "JBoss
Drools Business Rules" book's instructions for getting familiar with Drools.
When adding action to rule I cannot get the "add more options" feature
working in Guided Editor - "U->" like icon is missing and the "pen" icon
does not work either. For those who have the book, I'm talking about the
example in page 102. The data model is exactly as described in the sample
case. Any idea of what's the problem?
BR,
Pekka
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15 years, 1 month
Drools 5.0 -> 5.2 Migration Issue
by Steven Waldren
I am working to migrate my project from 5.0 to 5.2.0 Final. I am getting an error that I cannot figure out how to fix.
I get the error stack trace below my email signature. The only thing the consequence does is insert an object. This rule worked well in 5.0, and some of the early 5.2.0-snapshot builds. When I comment out the rule, I get the same error for a similar rule.
The rule:
rule "ccr - Person"
when
ActorType.Person($g:gender != null)
then
insert($g);
end
The documentation does not say this is an incorrect syntax. Any help would be appreciated.
Best,
Steven
--
Steven E. Waldren, MD MS
Co-founder, Open Health Data
swaldren(a)openhealthdata.com
validateTest(org.openhealthdata.validator.ValidatorManagerTest) Time elapsed: 11.699 sec <<< ERROR!
org.drools.runtime.rule.ConsequenceException: rule: ccr - Person
at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:916)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:845)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1056)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:733)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:699)
at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218)
at org.openhealthdata.validator.ValidationManager.validate(ValidationManager.java:158)
at org.openhealthdata.validator.ValidationManager.validate(ValidationManager.java:108)
at org.openhealthdata.validator.ValidatorManagerTest.validateTest(ValidatorManagerTest.java:26)
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:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:35)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:115)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:97)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.maven.surefire.booter.ProviderFactory$ClassLoaderProxy.invoke(ProviderFactory.java:103)
at $Proxy0.invoke(Unknown Source)
at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:150)
at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcess(SurefireStarter.java:91)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:69)
Caused by: org.drools.RuntimeDroolsException: Exception executing predicate
at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:298)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130)
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:450)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:378)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:450)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:378)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:450)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:378)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:193)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:191)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:332)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:293)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:905)
at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:119)
at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:113)
at org.astm.ccr.rules.core.Rule_ccr___Person_0.defaultConsequence(Rule_ccr___Person_0.java:7)
at org.astm.ccr.rules.core.Rule_ccr___Person_0DefaultConsequenceInvoker.evaluate(Rule_ccr___Person_0DefaultConsequenceInvoker.java:27)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:906)
... 37 more
Caused by: java.lang.NullPointerException
at org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:104)
at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:291)
... 58 more
15 years, 1 month
Any high volume trading examples?
by Nigel R Murray
Hello all. I'm at the point where I need to pick the brains of those of you
who have spent significant time with Drools I am just in the process of
trying to decide if Drools is the right choice for a high volume trading
application. It would be best if there were some simple examples out there
of how to create this type of app in Drools but I suspect they don't exist.
(The reason I even considered moving to a CEP framework is that I know that
Streambase claims to be ideal for this type of application. But they are
way out of our budget.)
The application we are developing is highly modular and multi-threaded with
many self-contained operations/modules that can be performed in parallel on
incoming events. Each threaded module would take as its inputs either the
input stream event or the outputs some other modules. Eventually the
various outputs would be combined into an output trade request event.
I can envisage how to create such an application directly in Java using,
say, the Observer pattern (where each of the modules subscribes to its
desired inputs) but it's difficult to get this to run multi-threaded and we
are going to need to be able to use all the processors and cores available
on the executing server. It's also a clumsy way to implement what should be
an elegant architecture. If I understand the Drools paradigm correctly,
Drools should take care of multi-threading and timestamp synchronization
automatically. This is the appeal.
I fear this is coming out a little like gobbledegook but before I spend much
more time on understanding how Drools works, I thought some of you experts
might have some simple words of advice.
Any comments or suggestions or am I way off base here?
Thanks!
Nigel
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15 years, 1 month
MUTEX, mutual exclusion in Drools?
by itchupe
Hello there
I am new to all drools...
How can I 'mutex' in drools? Or could you suggest a better concept for that?
(i mean, when two rules would fire : rule1 and rule2 in agenda
the mutex is checked and : mutex for this case is defined, rule1
= higher, rule2 = lower prio
only the one rule with higher priority will be executed)
Cheers. Please let me know if my question is understandable...
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15 years, 1 month
Drools & jBPM team hiring soon
by Mark Proctor
http://blog.athico.com/2011/06/drools-jbpm-team-hiring-soon.html
I'll post more details when I have them, but I thought I'd let people
know we'll be hiring multiple positions over the next 6 to 9 months for
Drools and jBPM.
We'll have an immediate position for a very senior Drools programmer
extraordinaire. We'll be looking for someone able to help us build the
next generation high performance reasoning engine.
So if you think in ontologies, eat Prolog for breakfast, are fluent in
Haskell, able to give a detailed critique of FIPA and explain truth
maintenance and defeasible reasoning while also being able to design and
build scalable parallel, concurrent and distributed java systems – send
me an email :) mproctor at codehaus d0t org
15 years, 1 month
