April 2009 - rules-users - Jboss List Archives

by Marc Dzaebel

Hi, w're evaluating Drools Flow 5 as a process engine for bigger projects at Volkswagen in a world wide szenario. There is one crucial question about process persistence. Process instances are currently saved binary (@LOB) via ObjectOutputStream and ByteArrayOutputStream through JPA. May be this is efficient for persisting, however, it disables ordinary database access. E.g. if you use process variables and need to find a certain process instance with some process variable values we'd need to unwrap each process for a detailed access. For >100000 processes in the database this might be too slow as Java needs to load all instances for access. We could save process data redundantly via ordinary JPA queries but this could be dangeous. It would be a rewrite of process persistence. Is there a plan to extend the persistence strategy to allow ordinary database access via JPA (no LOBs)? In our current szenario we would have to wrap orders into a process that is persisted. Of course we'd need to search for older input during the process directly in the database. Thanks in advance Marc -- View this message in context: http://www.nabble.com/JPA-persistence-for-Drools-Flow-tp22918819p22918819... Sent from the drools - user mailing list archive at Nabble.com.

15 years, 8 months

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Re: [rules-users] Bizarre bug or user error:

by Tom.E.Murphy＠wellsfargo.com

Wolfgang - Thanks for your reply. As I said in the original subject line -- bizarre bug or user error? Well, it turns out to have been user error -- There was another rule in the rulebase that was altering values on the PolicySet objects, but failing to update() them. This caused the Rule Engine to evaluate using old matches and produced wrong results. If you did file a JIRA, you can probably cancel it. -- <red faced> -- Sorry for the confusion. Date: Tue, 7 Apr 2009 08:59:46 +0200 From: Wolfgang Laun <wolfgang.laun(a)gmail.com> Subject: Re: [rules-users] Bizarre bug or user error: To: Rules Users List <rules-users(a)lists.jboss.org> Message-ID: <17de7ee80904062359w449a42e3y71d218634dc76b6e(a)mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Hi, On 4/7/09, Tom.E.Murphy(a)wellsfargo.com <Tom.E.Murphy(a)wellsfargo.com> wrote: > I have the following rule, which is executing in the midst of a complex > data set and a couple hundred other rules: > > rule "RS6492.1.2" > when > TransactionSummary > ( > $LTVRatioPrcnt : LTVRatioPrcnt > ) > PolicySet > ( > $maxLTVRatioPrcnt : maxLTVRatioPrcnt, > maxLTVRatioPrcnt < $LTVRatioPrcnt > ) This is better written as a single field restriction with binding, all in one: PolicySet( $maxLTVRatioPrcnt : maxLTVRatioPrcnt < $LTVRatioPrcnt ) Nevertheless, you are right: This should either succeed (firing only once) even when written separately or be flagged as an error. I'll file a JIRA. -W > then > System.out.println("RS6492.1.2 fired. $maxLTVRatioPrcnt > = " + $maxLTVRatioPrcnt + ", $LTVRatioPrcnt = " + $LTVRatioPrcnt); > // actual actions removed ... > end > > In the dataset, there are two PolicySets with maxLTVRatioPrcnt values of > 95.0 and 80.0 respectively. The LTVRatioPrcnt in the TransactionSummary > is 85.0. > When my rules run, The above rule should fire only once, for the > PolicySet with 80.0 as its maxLTVRatioPrcnt. However, it fires twice - > once for each PolicySet - with the following outputs: > > RS6492.1.2 fired. $maxLTVRatioPrcnt = 95.0, $LTVRatioPrcnt = 85.0 > RS6492.1.2 fired. $maxLTVRatioPrcnt = 80.0, $LTVRatioPrcnt = 85.0 > > How is this possible? Why is the comparison of maxLTVRatioPercnt < > $LTVRatioPrcnt succeeding in both cases, causing the rule to fire on > both PolicySets? > I'm running Drools 5.0.0 with jars dated 15 Jan 09. > Thanks in advance... > > Tom Murphy > Wells Fargo HCFG - CORE Deal Decisioning Platform > This message may contain confidential and/or privileged information. If > you are not the addressee or authorized to receive this for the > addressee, you must not use, copy, disclose, or take any action based on > this message or any information herein. If you have received this > message in error, please advise the sender immediately by reply e-mail > and delete this message. Thank you for your cooperation. > > >

15 years, 9 months

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ConsequenceInvokers building up in heap

by toddp2

I am currently using drools in a project and I am finding that my heap is accumulating (and seemingly not releasing) several ConsequenceInvoker classes. I have done a search on possible causes but have not found much regarding this issue. Below is an excerpt of the code that runs the rules engine. I have checked that the code deregisters the execution set and closes the rulesession, is there anything else that it needs to do to release resources? Thanks, Todd try { RuleExecutionSet rexeSet = null; StatelessRuleSession ruleSession = null; rexeSet = _localRuleExeSetProvider.createRuleExecutionSet(strReader, properties); uidName = new UID();//use a unique name for this rule set each time through _ruleAdmin.registerRuleExecutionSet(uidName.toString(), rexeSet, null); ruleSession = (StatelessRuleSession)_ruleRunTime.createRuleSession(uidName.toString(), null, RuleRuntime.STATELESS_SESSION_TYPE); //execute the rules and facts listRetDrools = (List)ruleSession.executeRules(listFacts); } catch(Exception e){ _log.fatal("Rule Engine execution error!", e); throw new RuleEngineException(RuleEngineErrorType.RULEENGINE_EXECUTION_ERROR, e); } finally { //release the rule session if (ruleSession != null) { try { ruleSession.release(); _log.info("Released the rule session."); } catch(Exception e) { _log.fatal("Rule Engine execution cleanup error!", e); throw new RuleEngineException(RuleEngineErrorType.RULEENGINE_EXECUTION_CLEANUP_ERROR, e); } } else _log.info("No rule session to release."); //deregister the execution set if (rexeSet != null && uidName != null) { try { _ruleAdmin.deregisterRuleExecutionSet(uidName.toString(), null); } catch(Exception e) { _log.fatal("Rule Execution Set deregistration error!", e); throw new RuleEngineException(RuleEngineErrorType.RULEENGINE_EXECUTION_CLEANUP_ERROR, e); } } else _log.info("No rule execution set to deregister."); //close our rule reader if (strReader != null){ strReader.close(); _log.info("Closed the rule stream."); } //close our dsl reader... if (strDSLReader != null) { strDSLReader.close(); _log.info("Closed the DSL stream."); } } -- View this message in context: http://www.nabble.com/ConsequenceInvokers-building-up-in-heap-tp22927995p... Sent from the drools - user mailing list archive at Nabble.com.

15 years, 9 months

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Rule Count and Consequence Sets

by Arjun Dhar

Hi, I have many rules. These rules may or may not belong to the same set. However, based on their name they can be grouped. Say all rules starting with "Traffic_Rule", "Criminal_Rule" etc. Q1. I want to check after assertion of a fact (A.) how many and (B.) which all rules executed for "Traffic_Rule" and the result will fire another rule. (So I want all this in the rules files only) - So in a way I want to collect the consequences and based on the result of that consequence set fire more rules. Q2. evals() are expensive. I dont think we can assign the output of an eval in the condition to a variable; so how do I re-use an eval in a condition and then in the consequence? (To avoid calling the function multiple times) regards, Arjun

15 years, 9 months

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Bug in Guvnor?

by hpost

Hi. I didn't see this in Jira, and it is very reproducible for me. I am using 5.0CR1, and trying to work completely in Guvnor. I create a simple Model, add a Business Rule and a Test Scenario, and all works fine. As soon as I add a function, the Test Scenarios no longer work. If I delete the function, the Test Scenario starts working again. Here is a simple sample. package TestPkg declare TestFact name: String age: Integer end function int testFunc() { return 2; } rule "TestRule" dialect "mvel" when $testFact : TestFact( name == "Bill" ) then $testFact.setAge( 3 ); end I'm not even calling the function - just its presence causes Test Scenarios to fail. Thanks, Herman Post -- View this message in context: http://www.nabble.com/Bug-in-Guvnor--tp22919335p22919335.html Sent from the drools - user mailing list archive at Nabble.com.

15 years, 9 months

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Bizarre bug or user error:

by Tom.E.Murphy＠wellsfargo.com

I have the following rule, which is executing in the midst of a complex data set and a couple hundred other rules: rule "RS6492.1.2" when TransactionSummary ( $LTVRatioPrcnt : LTVRatioPrcnt ) PolicySet ( $maxLTVRatioPrcnt : maxLTVRatioPrcnt, maxLTVRatioPrcnt < $LTVRatioPrcnt ) then System.out.println("RS6492.1.2 fired. $maxLTVRatioPrcnt = " + $maxLTVRatioPrcnt + ", $LTVRatioPrcnt = " + $LTVRatioPrcnt); // actual actions removed ... end In the dataset, there are two PolicySets with maxLTVRatioPrcnt values of 95.0 and 80.0 respectively. The LTVRatioPrcnt in the TransactionSummary is 85.0. When my rules run, The above rule should fire only once, for the PolicySet with 80.0 as its maxLTVRatioPrcnt. However, it fires twice - once for each PolicySet - with the following outputs: RS6492.1.2 fired. $maxLTVRatioPrcnt = 95.0, $LTVRatioPrcnt = 85.0 RS6492.1.2 fired. $maxLTVRatioPrcnt = 80.0, $LTVRatioPrcnt = 85.0 How is this possible? Why is the comparison of maxLTVRatioPercnt < $LTVRatioPrcnt succeeding in both cases, causing the rule to fire on both PolicySets? I'm running Drools 5.0.0 with jars dated 15 Jan 09. Thanks in advance... Tom Murphy Wells Fargo HCFG - CORE Deal Decisioning Platform This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation.

15 years, 9 months

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Drools Flow persistance

by Petersen, Jan (CH Ext)

Hello, I been searching through all the documentation I could find about how to persist a flow. In the whats-new-in-drools-5-video-and-q session I found the following: ---------------------------- Q: For long-running processes involving human tasks, how is the state of the process/flow persisted? A: Various approaches available - database via hibernate for instance, file system, all intended for high performance. Working Memories are now transactional and persistable (JPA is also an option). ---------------------------- Is there any examples available somewhere which describes how to persist to the file system (for a simple start)? Best regards Jan Petersen

15 years, 9 months

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Rule package/rule name/ruleflow-group question

by brian.xiang＠thomsonreuters.com

Hi, I am new to Drools. I am not sure how rules should be organized using package. My questions are: 1) Should rule name/ruleflow-group name be unique within the same package or globally? 2) Can multiple packages be loaded into workingmemory at the same time? if this true, then I have following quesitons: 2.1 How to load multiple packages? 2.2 How the rules have the same name but belong to different packages, are differieniated and fired? Thanks, Brian Xiang

15 years, 9 months

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HumanTask Content parameter

by Garrett Conaty

Is it planned to add support for more than the StringDataType to HumanTasks? I noticed that the WSHumanTaskHandler takes whatever content and serializes it to a byte[], but the HumanTaskNode sets a parameter definition of StringType. I noticed one of the sample apps with a work item (FileFinder.rf?) that would take arbitrary content. Is there a best practice here? I could see for portability setting the content as an XML or JSON string which would be fine, but just wondered if other use cases were possible. Thanks, Garrett

15 years, 9 months

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Re: [rules-users] Significant memory degradation in high transaction system

by Michael Finger

Have you profiled your application yet? You can get a free trial of yourKit, or play with the visual JVM in JDK 6.. sburrows wrote: > > Hello, > After the introduction of drools into our application, we see our memory > declining over the course of 2-3 days to the point were the garbage > collector thrashes, latency becomes unbearable (> 5 sec) and we have to > restart the servers. We also notice that the garbage collector runs much > more frequently all of the time. > > Here's our setup: > - drools 4.0.7 > - multi-threaded web application that receives around 10 hits per second > - about 30 rules defined > - we update a global RuleBase nightly by creating a new RuleBase and > replacing the old one, so the old one should be GC'd when there are no > more sessions using it > - we create a new StatefulSession for each web application session and > call dispose() when the web session expires (30min) > - servers have 2GB RAM each > > Besides the RuleBase reference to StatefulSession (which is removed by > dispose), are there any other 'hooks' which might cause memory to be > retained longer than the StatefulSession? Is our usage correct? Has > anyone else had this problem? Any other ideas how to resolve this? > > Thanks for your help! > sburrows. > > -- View this message in context: http://www.nabble.com/Significant-memory-degradation-in-high-transaction-... Sent from the drools - user mailing list archive at Nabble.com.

15 years, 9 months

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rules-users April 2009