drools quirks
by Matt Young
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I just started using drools and this is my first time implementing a
rules engine. Everything has been pretty smooth but I have some
quirks that I am not sure I can live with.
1) for some reason, if I execute the Knowlege session against an
object, the knowlege session never returns. The only way I can get
the ksession to return is to make IF (obj == null) part of the LHS and
make modify($input){setObj("complete")} part of the RHS
This seems like a deficiency since I have users writing their own
rules, I can see them forgetting this requirement. IS their a way to
get the ksession to firerules only once? If so what does that look like?
2) It seems that any code I want can be executed in the RHS. I could
literally execute something like the following in the RHS.
byte[] b= new byte[10000000000000]; // Really big memory waste
I also could just start a bunch of threads.
The point is that I am intending to let the users write their own
rules but I can't do that if there are no restrictions on how/what can
be done inside the rules. Any suggestions? Are there sandboxes or
filters I can activate to restrict the RHS?
- --
Cheers,
Matt Young
solid(a)youngdev.net
http://youngdev.net
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15 years, 6 months
calling a function from "when"
by Kripa Nathwani
Hello,
I need to know whether it is possible to call a function from within a "when" condition?
I am currently trying with a simple print function just for checking but it is not working.
Best Regards,
Kripa
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15 years, 6 months
Flow Timer causes exception: Caused by: java.util.concurrent.RejectedExecutionException
by Gustavo Tenrreiro
Hi,
I have a flow and a set of rules.
In the flow I have a wait state. If the wait state has a timer, when
the flow reaches the node it blows up with the following exception (
See Below ), if I remove the timer everything works.
INFO 2010-09-18 16:26:28 [ERROR]
com.kgcontrols.services.raytheon.standardsRequests.workflow.managers.DroolsEventsManager
Could not commit session
java.lang.RuntimeException: Could not commit session
at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:292)
at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.execute(CommandBasedStatefulKnowledgeSession.java:434)
at com.kgcontrols.services.raytheon.standardsRequests.workflow.managers.DroolsEventsManager.sendEvent(DroolsEventsManager.java:43)
at com.kgcontrols.services.raytheon.standardsRequests.workflow.Rule_domainLeadReject_0.defaultConsequence(Rule_domainLeadReject_0.java:10)
at com.kgcontrols.services.raytheon.standardsRequests.workflow.Rule_domainLeadReject_0DefaultConsequenceInvoker.evaluate(Rule_domainLeadReject_0DefaultConsequenceInvoker.java:34)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:917)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:856)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1071)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:785)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:751)
at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218)
at org.drools.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:99)
at org.drools.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:33)
at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:279)
at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.fireAllRules(CommandBasedStatefulKnowledgeSession.java:201)
at com.kgcontrols.services.raytheon.standardsRequests.workflow.listeners.VoteCreatedEventListener.onMessage(VoteCreatedEventListener.java:78)
at org.apache.activemq.ActiveMQMessageConsumer.dispatch(ActiveMQMessageConsumer.java:854)
at org.apache.activemq.ActiveMQSessionExecutor.dispatch(ActiveMQSessionExecutor.java:99)
at org.apache.activemq.ActiveMQSessionExecutor.iterate(ActiveMQSessionExecutor.java:166)
at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:117)
at org.apache.activemq.thread.PooledTaskRunner.access$100(PooledTaskRunner.java:26)
at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:44)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.util.concurrent.RejectedExecutionException
at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:1768)
at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:767)
at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:216)
at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:379)
at org.drools.time.impl.JDKTimerService.schedule(JDKTimerService.java:102)
at org.drools.time.impl.JDKTimerService.scheduleJob(JDKTimerService.java:80)
at org.drools.process.instance.timer.TimerManager.registerTimer(TimerManager.java:60)
at org.drools.workflow.instance.node.StateBasedNodeInstance.internalTrigger(StateBasedNodeInstance.java:56)
at org.drools.workflow.instance.node.CompositeNodeInstance.internalTrigger(CompositeNodeInstance.java:86)
at org.drools.workflow.instance.node.StateNodeInstance.internalTrigger(StateNodeInstance.java:48)
at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:117)
at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:178)
at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:144)
at org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:53)
at org.drools.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:117)
at org.drools.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:98)
at org.drools.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java:201)
at org.drools.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:258)
at org.drools.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:234)
at org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:337)
at org.drools.persistence.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:99)
at org.drools.process.workitem.email.EmailWorkItemHandler.executeWorkItem(EmailWorkItemHandler.java:104)
at org.drools.persistence.processinstance.JPAWorkItemManager.internalExecuteWorkItem(JPAWorkItemManager.java:45)
at org.drools.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:101)
at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:117)
at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:178)
at org.drools.workflow.instance.node.SplitInstance.internalTrigger(SplitInstance.java:94)
at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:117)
at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:178)
at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:144)
at org.drools.workflow.instance.node.JoinInstance.triggerCompleted(JoinInstance.java:152)
at org.drools.workflow.instance.node.JoinInstance.internalTrigger(JoinInstance.java:52)
at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:117)
at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:178)
at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:144)
at org.drools.workflow.instance.node.EventNodeInstance.triggerCompleted(EventNodeInstance.java:66)
at org.drools.workflow.instance.node.EventNodeInstance.signalEvent(EventNodeInstance.java:50)
at org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:351)
at org.drools.command.runtime.process.SignalEventCommand.execute(SignalEventCommand.java:95)
at org.drools.impl.StatefulKnowledgeSessionImpl.execute(StatefulKnowledgeSessionImpl.java:879)
at org.drools.impl.StatefulKnowledgeSessionImpl.execute(StatefulKnowledgeSessionImpl.java:862)
at org.drools.command.ExecuteCommand.execute(ExecuteCommand.java:50)
at org.drools.command.ExecuteCommand.execute(ExecuteCommand.java:31)
at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:279)
... 24 more
INFO 2010-09-18 16:26:28 [ERROR]
com.kgcontrols.services.raytheon.standardsRequests.workflow.listeners.VoteCreatedEventListener
Unable to consume Vote created event: Could not commit session or
rollback
java.lang.RuntimeException: Could not commit session or rollback
at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:289)
at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.fireAllRules(CommandBasedStatefulKnowledgeSession.java:201)
at com.kgcontrols.services.raytheon.standardsRequests.workflow.listeners.VoteCreatedEventListener.onMessage(VoteCreatedEventListener.java:78)
at org.apache.activemq.ActiveMQMessageConsumer.dispatch(ActiveMQMessageConsumer.java:854)
at org.apache.activemq.ActiveMQSessionExecutor.dispatch(ActiveMQSessionExecutor.java:99)
at org.apache.activemq.ActiveMQSessionExecutor.iterate(ActiveMQSessionExecutor.java:166)
at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:117)
at org.apache.activemq.thread.PooledTaskRunner.access$100(PooledTaskRunner.java:26)
at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:44)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.RuntimeException: Unable to rollback transaction
at org.drools.persistence.session.JtaTransactionManager.rollback(JtaTransactionManager.java:181)
at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:287)
... 11 more
Caused by: java.lang.IllegalStateException: no transaction started on
this thread
at bitronix.tm.BitronixTransactionManager.rollback(BitronixTransactionManager.java:111)
at org.drools.persistence.session.JtaTransactionManager.rollback(JtaTransactionManager.java:178)
... 12 more
Can someone point me in the right direction.
Thanks
15 years, 6 months
LHS compare two lists
by lnguyen
Hi,
I'm trying to determine if a user has the required certifications for a
position. So I'm comparing the list of required certifications to the list
of User Certifications but I'm throwing a nullPointerException even though I
check to make sure the list are not null on their respective objects. How do
I iterate between both list?
rule "Determine if the user has the required certifications"
dialect 'mvel'
no-loop true
salience 80
when
$user : User()
$profile : UserProfile($userCertifications : userCertifications,
eval(userCertifications != null)) from $user.userProfile
$position : Position($certifications : requiredCertifications,
eval(requiredCertifications != null))
exists ($certification: Certification() from $certifications and
UserCertification(certification == $certification) from $userCertifications)
then
System.out.println("The user has the required certifications");
end
public UserProfile
{
List<UserCertification> userCertifications;
//more fields
}
public Position
{
List<Certification> requiredCertifications;
//more fields
}
public Certification
{
Long id;
String name;
//more fields
}
public UserCertification
{
Long id;
Date certificationDate;
Certification certification;
//more fields
}
--
View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/LHS-compare-two-lists...
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15 years, 6 months
Drools flow and BPEL (Drools 5.1)
by tim
Hello,
I am studying how to integrate Drools 5.1 into our product. And we will need
a BPEL engine embedded in Drools. I read from the "Drools Flow User Guide"
that "the Drools Flow engine is based on a generic process engine that
allows the definition and execution of different types of process languages,
like for example our RuleFlow language, WS-BPEL ..." But I can't find any
documentation or examples available for using BPEL in Drools. If you have
done something similar, please let me know. Any suggestion will be helpful!
Thanks in advarce!
--
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15 years, 6 months
drools syntax highlighting editor
by Matt Young
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is there a drools syntax highlighting widget along the lines of
tinymce for regular html pages. I'm certain there is a seam or JSF
component but my application is a JSP based springmvc application and
I would like to not have to migrate to something else, just to
provided a good rules editor in my application.
- --
Cheers,
Matt Young
solid(a)youngdev.net
http://youngdev.net
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15 years, 6 months
Re: [rules-users] Welcome to the "rules-users" mailing list
by Aman
Hello,
I can see Drools 5.1 is going to add support for Spring integration.
How about Seams, I think it is already integrated, because in all
presentations, I haven't seen anyone referring to Seam.
Thanks
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
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15 years, 6 months
Re: [rules-users] Perfromance issues and memory leaks in Drools (Edson Tirelli)
by Nikhil S. Kulkarni
Hi Edson,
Thanks for the information.
But now I want to ask you one thing. I have seen your post. The problem in application is mainly usage of memory
You posted that Match 30,2010. I downloaded Drools 5.0 on August 2009 and I am using that.
SO this "True modify" algorithm is implemented in Drools 5.1 only or it is even available in latest Drools 5.0
If I use Drools 5.1 then Whether I will get any advantage.
In application we are using Rules Template ,Rule Flows and drls. When I am calling Rules from Java then it is taking more time compared to calling Java method from rules.
In addition to this can u suggest me how to write better rules Query.
I am using very simple way of writing Rules Query like :-
When
Abc : ABC(condition==A)
Then
Call method
End;
Thanks & Regards,
Nikhil S. Kulkarni
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of rules-users-request(a)lists.jboss.org
Sent: Friday, September 17, 2010 9:30 PM
To: rules-users(a)lists.jboss.org
Subject: rules-users Digest, Vol 46, Issue 58
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Today's Topics:
1. Re: Perfromance issues and memory leaks in Drools (Edson Tirelli)
----------------------------------------------------------------------
Message: 1
Date: Fri, 17 Sep 2010 11:04:55 -0400
From: Edson Tirelli <tirelli(a)post.com>
Subject: Re: [rules-users] Perfromance issues and memory leaks in
Drools
To: Rules Users List <rules-users(a)lists.jboss.org>
Message-ID:
<AANLkTinr2-+twT_myOijf1rc_wAw7E6CVtwjPNGKBOb_(a)mail.gmail.com>
Content-Type: text/plain; charset="windows-1252"
Nikhil,
Maybe you are using the term "memory leak" loosely here, but otherwise,
Drools 4.0.7 and Drools 5.0.1 were both tested to exhaustion for memory
leaks and I can tell you that no memory leak was found, and I personally
doubt there is one there on regular use. Also, FYI, Drools 5.x eliminates
the need for shadow facts, what is a considerable memory save over 4.x, but
adds some other overheads for performance improvement that kind of offset
those gains. On the other hand, Drools 5.1.1 takes the algorithm to a new
level, saving a lot of memory on systems that use modify actions on their
rules.
http://blog.athico.com/2010/03/drools-halves-memory-use-with-new-true.html
Regarding your performance, all I can tell you is that a rules engine is
a relational engine that works pretty much like a database, and rules as
databases queries. The same way you can write SQL queries that run fast or
slow on a database, you can write rules that run fast or slow on a rules
engine. It all depends on how the rules/queries are written, how your data
model/domain model looks like, etc.
So, regarding your question, we can't tell you how to improve those
metrics without knowing your domain model, rules and etc.
[]s
Edson
2010/9/17 Nikhil S. Kulkarni <Nikhil.Kulkarni(a)mastek.com>
> Hi,
>
>
>
> I have written 2 different Drools programs. One is with
> Using rule Base of Drools 4.0 and other is using Knowledge Base of Drools
> 5.0.
>
> I was trying to check that is there any improvement in Drools 5.0. But I
> haven?t got any performance improvement in Drools 5.0 code compared to
> Drools 4.0.
>
>
>
> One more important thing is I am calling this drools code
> from My application which itself is heavy application, when I am doing
> Performance tuning
>
> I got one point i.e. session.execute() method is taking around 6-7 seconds
> to initialize rules and even the memory utilized by Rules is huge.
>
>
>
> So is there any way that we can reduce the Memory leakage and improve
> performance.
>
>
>
> Waiting for Reply.
>
>
>
> Thanks & Regards,
>
> Nikhil S. Kulkarni
>
> Emp No: - 9254
>
>
>
>
>
> MASTEK LTD.
> In the US, we're called MAJESCOMASTEK
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Opinions expressed in this e-mail are those of the individual and not that of Mastek Limited, unless specifically indicated to that effect. Mastek Limited does not accept any responsibility or liability for it. This e-mail and attachments (if any) transmitted with it are confidential and/or privileged and solely for the use of the intended person or entity to which it is addressed. Any review, re-transmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. This e-mail and its attachments have been scanned for the presence of computer viruses. It is the responsibility of the recipient to run the virus check on e-mails and attachments before opening them. If you have received this e-mail in error, kindly delete this e-mail from desktop and server.
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> _______________________________________________
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> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
--
Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
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15 years, 6 months
