November 2013 - rules-users - Jboss List Archives

Access global functions in Test Scenarios in Guvnor

by franky0517

Hi, I have written a function in Guvnor. Now I am creating a test scenario where I want to call this function. As test scenario doesnt have "Free from DRL" option, is there an another way to call the function ? Thanks, Asim -- View this message in context: http://drools.46999.n3.nabble.com/Access-global-functions-in-Test-Scenari... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 7 months

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Calling RuleSet from a Function/Another Rule

by Chakraborty, Ayon (Genworth, Contractor)

Hello All, We are trying to migrate from Blaze to Drools Guvnor. In Blaze Rule Language, we have functions where depending on conditions, we can call one RuleSet or Decision Table. Is there any functionality in Drools where I can call rule inside another rule depending on some conditions. ( Suppose I have my DRL file and I want to call another rule in the action of one rule) Is that possible in Drools Guvnor 5.5? Any possible alternative ways in Drools? Thanks, Ayon Chakraborty

12 years, 7 months

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Rule For Counting Planning Variables/Entities

by newbie

I am new user of drools and I'm trying to recreate an application similar to nurse rostering. This time assigning an employee to a department for a specific period of time. My hard constraint was an employee must be assigned to a department at least 3 months. My planning entity is DepartmentAssignment and planning variable Employee. The planning entity class looks like this: @PlanningEntity(difficultyComparatorClass = DepartmentAssignmentDifficultyComparator.class) @XStreamAlias("DepartmentAssignment ") public class DepartmentAssignment extends AbstractPersistable{ private Duration duration; // per month private Department department; //Planning variable : changes during planning, between score calculations. private Employee employee; How can I make such rule? I tried using this but it seems not working. Am i missing something? rule "minimumNumberofMonths" when $employee : Employee() $department : Department() $assignedNumberOfMonths : Number(intValue > 0 && < 3) from accumulate( $assignment: DepartmentAssignment( employee!= null, department== $department, employee== $employee ), count($assignment) ) then insertLogical(new IntConstraintOccurrence("minimumNumberofMonths", ConstraintType.NEGATIVE_HARD, 1, $employee, $department)); end -- View this message in context: http://drools.46999.n3.nabble.com/Rule-For-Counting-Planning-Variables-En... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 7 months

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Session missing rules

by sandeep_nambiar

I have integrated Drools 5.3 in my Web application(running in Jboss 7.1). We were creating rules before starting the application. Now we are trying to create rules dynamically. Have added the folder path where I am creating rules dynamically in change-set.xml . After creating rules during runtime I am doing all required things mentioned in the documents. There itself after adding the new rule if i do a check in the available KnowledgePackages , I can see the new rule present in Package... But once I restart the Jboss ,and I see in the session some rules which I have created before are missing..its not always the same rule..it varies on each restart. We are using StatefulSessions and I have made the "drools.agent.newInstance" as false.. Please provide a solution for the same... -- View this message in context: http://drools.46999.n3.nabble.com/Session-missing-rules-tp4026709.html Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 7 months

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Govner - drools:resource-change-scanner

by san_hegde

Hi All, Our application is developed using Spring framework. We have our Rules in Guvnor. In our application we use resource scanner to poll Guvnor to check and download the latest package if modified like below. <drools:resource-change-scanner id="s1" interval="3600" /> The issue is in case if Guvnor goes down and during that time if scanner checks Guvnor and finds Guvnor is down, THEN 1) In the application the local copy of the Rules package which Spring bean have is lost. Hence Rules will not be fired. 2) Even if we restart the Guvnor, the scanner not scanning the resource. I have one package in Guvnor. Before the Guvnor went down the log message from scanner was "ResourceChangeScanner attempt to scan 1 resources" After the Guvnor went down the log message is "ResourceChangeScanner attempt to scan 0 resources" That means it is not even scanning the Guvnor resource as the log message says its 0 resource scanning. Any idea on how to handle this kind of scenario where even if Guvnor goes down Spring should still should continue using its spring local copy which it downloaded while starting the application. My complete spring bean configuration is as below. <bean id="EnvConfiguration" class="com.hp.rebates.grs.model.rules.conf.EnvConfiguration"> </bean> <drools:resource id="resource" source="#{EnvConfiguration.ruleEngineURL}" type="CHANGE_SET" /> <drools:resource-change-scanner id="s1" interval="3600" /> <drools:kagent kbase="knowledgeBase" id="kagent" new-instance="false"> <drools:resources> <drools:resource ref="resource" /> </drools:resources> </drools:kagent> <drools:kbase id="knowledgeBase"> <drools:resources> <drools:resource ref="resource" /> </drools:resources> </drools:kbase> <drools:ksession id="knowledgeSession" type="stateless" kbase="knowledgeBase" /> <bean id="StartChangeScanner" class="com.hp.rebates.grs.model.rules.conf.StartChangeScanner"> </bean> -- View this message in context: http://drools.46999.n3.nabble.com/Govner-drools-resource-change-scanner-t... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 7 months

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how can I modify a batch of objects

by Elran Dvir

Hi all, I am trying to identify a port scan event. The basic fact is connection log. For each combination of src (source IP) and dst (destination IP) , detect a port scan event, if over 60 seconds there were at least 20 connection logs with different service and protocol. The event will stay closed for 10 minute - no event will be sent during this time for this combination of src and dst. The event will contain the connection logs' ids (markers). I tried to implement it using "accumulate" and "over window:time" but it consumes too much memory. So I am trying to imitate this functionality using several rules and facts. My drl contains the following lines (among others): declare CorrelatedEvent @role( event) @expires( 600s ) end declare CandidatesWindow @role( event) @expires( 60s ) end rule "Create Port Scan Event - 1" enabled true dialect "java" no-loop when $log : Log() not CorrelatedEvent(getId() == "portScan" , groupByFieldsMap.get("src") == $log.fieldsMap.get("src") ,groupByFieldsMap.get("dst") == $log.fieldsMap.get("dst")) $windows : ArrayList() from collect( CandidatesWindow(getRuleId() == "portScan" , groupByFieldsMap.get("src") == $log.fieldsMap.get("src") , groupByFieldsMap.get("dst") == $log.fieldsMap.get("dst"))) then String id = $log.fieldsMap.get("port").toString(); System.out.println(new Date().toString()+" windowSize: " + $windows.size()); for (Object windowObj : $windows) { CandidatesWindow window = (CandidatesWindow) windowObj; modify ( window ) { addLog($log, id) } } CandidatesWindow newWindow = new CandidatesWindow("portScan", true); newWindow.groupByFieldsMap.put("src", $log.fieldsMap.get("src")); newWindow.groupByFieldsMap.put("dst", $log.fieldsMap.get("dst")); newWindow.addLog($log, id); insert(newWindow); end This imitates sliding time windows. when I tested it, I got the following exception: Exception executing consequence for rule "Create Port Scan Event - 1" in com.checkpoint.correlation.impl.drools.package1: java.util.ConcurrentModificationException 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.checkpoint.correlation.impl.drools.DroolsCEPEngineV1.insertEvents(DroolsCEPEngineV1.java:173) at com.checkpoint.correlation.impl.feeder.JsonFileFeeder.init(JsonFileFeeder.java:68) at com.checkpoint.correlation.server.CorrelationServer.initFeeder(CorrelationServer.java:63) at com.checkpoint.correlation.server.CorrelationServer.run(CorrelationServer.java:28) at com.checkpoint.correlation.server.CorrelationServer.runServer(CorrelationServer.java:101) at com.checkpoint.correlation.server.CorrelationServer.main(CorrelationServer.java:85) Caused by: java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:819) at java.util.ArrayList$Itr.next(ArrayList.java:791) at com.checkpoint.correlation.impl.drools.package1.Rule_Create_Port_Scan_Event___1_2f94bc67f9064c6e9614982cf9bc8859.defaultConsequence(Rule_Create_Port_Scan_Event___1_2f94bc67f9064c6e9614982cf9bc8859.java:11) at com.checkpoint.correlation.impl.drools.package1.Rule_Create_Port_Scan_Event___1_2f94bc67f9064c6e9614982cf9bc8859DefaultConsequenceInvokerGenerated.evaluate(Unknown Source) at com.checkpoint.correlation.impl.drools.package1.Rule_Create_Port_Scan_Event___1_2f94bc67f9064c6e9614982cf9bc8859DefaultConsequenceInvoker.evaluate(Unknown Source) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287) ... 11 more It is caused by modify ( window ) in the for loop. How can I make it work? Thanks.

12 years, 7 months

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Drools get value from stateful session

by forsakendoll

How can I get the value from a stateful session. As they say I can use this: protected Collection findFacts( final StatefulKnowledgeSession session, final String factClass ) { ObjectFilter filter = new ObjectFilter() { @Override public boolean accept( Object object ) { return object.getClass().getSimpleName().equals( factClass ); } }; Collection results = session.getObjects( filter ); return results; } to get the value from the rules. Given the fact the code already red the rules when I tried this: StatefulKnowledgeSession ksession = aKnowledgeBase.newStatefulKnowledgeSession(); ksession.insert( aBean ); ksession.fireAllRules(); Collection result = findFacts( ksession, "com.neu.als.thesis.db.beans.StudentBean" ); ksession.dispose(); for( Object test : result ) { System.out.println( test == null ); System.out.println( test ); } Nothing is printed. What is the proper way to get bean that I inserted in the rules? -- View this message in context: http://drools.46999.n3.nabble.com/Drools-get-value-from-stateful-session-... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 7 months

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Space Invaders in 8 minutes with Drools

by Mark Proctor

http://blog.athico.com/2013/11/space-invaders-in-8-minutes-with-drools.html — Following in the same fashion of Pong and Wumpus World, I've written a simplified Space Invaders game. I've uploaded it to youtube, make sure you watch it in high quality and full screen, to avoid blur text: http://www.youtube.com/watch?v=wORlAZoxttA It's not the complete game, but in it's current form is simpler than Pong or Wumpus World; so it's a better place to start learning. I've written it, with re-use in mind, such as the configuration classes and key rules, to be re-used in other games; although they will need refactoring first. For Invaders I've committed each stage of the game, as separate files, so it's easy to see the stages for yourself. The model classes and the 6 mains are here: https://github.com/droolsjbpm/drools/tree/master/drools-examples/src/main... The 6 drl folders for each of the mains are here: https://github.com/droolsjbpm/drools/tree/master/drools-examples/src/main...

12 years, 7 months

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Two Guvnor instances sharing repository

by Demian Calcaprina

Hi Guys, I have two guvnor instances. They are using a mysql db repository. I would like both to point to the same database. I configured them both to use the same database in the repository.xml, but it starting throwing errors and they were not in sync. Errors are like this 11:43:29,597 WARN [com.arjuna.ats.arjuna] (Transaction Reaper) ARJUNA012117: TransactionReaper::check timeout for TX 0:ffff7f000101:55ee0fc5:527e486a:3f in state RUN 11:43:29,599 WARN [com.arjuna.ats.arjuna] (Transaction Reaper Worker 0) ARJUNA012095: Abort of action id 0:ffff7f000101:55ee0fc5:527e486a:3f invoked while multiple threads active within it. 11:43:29,601 WARN [com.arjuna.ats.arjuna] (Transaction Reaper Worker 0) ARJUNA012108: CheckedAction::check - atomic action 0:ffff7f000101:55ee0fc5:527e486a:3f aborting with 1 threads active! 11:43:29,602 WARN [com.arjuna.ats.arjuna] (Transaction Reaper Worker 0) ARJUNA012121: TransactionReaper::doCancellations worker Thread[Transaction Reaper Worker 0,5,main] successfully canceled TX 0:ffff7f000101:55ee0fc5:527e486a:3f 11:44:37,245 INFO [org.apache.jackrabbit.core.query.lucene.IndexMerger] (jackrabbit-pool-5) merged 791 documents in 568 ms into _p. 11:44:37,377 INFO [org.apache.jackrabbit.core.query.lucene.IndexMerger] (jackrabbit-pool-2) merged 1370 documents in 709 ms into _o. 11:48:07,300 WARN [org.jboss.seam.transaction.TransactionServletListener] (http--127.0.0.1-8080-5) Error starting the transaction: javax.transaction.NotSupportedException: BaseTransaction.checkTransactionState - ARJUNA016051: thread is already associated with a transaction! at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.begin(BaseTransaction.java:63) at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.begin(BaseTransactionManagerDelegate.java:65) at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.begin(ServerVMClientUserTransaction.java:142) at org.jboss.seam.transaction.UTTransaction.begin(UTTransaction.java:51) [seam-transaction-3.1.0.Final.jar:3.1.0.Final] at org.jboss.seam.transaction.DefaultSeamTransaction.begin(DefaultSeamTransaction.java:88) [seam-transaction-3.1.0.Final.jar:3.1.0.Final] at org.jboss.seam.transaction.TransactionServletListener.requestInitialized(TransactionServletListener.java:110) [seam-transaction-3.1.0.Final.jar:3.1.0.Final] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [jbossweb-7.0.13.Final.jar:] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.13.Final.jar:] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.13.Final.jar:] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.13.Final.jar:] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.13.Final.jar:] at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.13.Final.jar:] at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.13.Final.jar:] at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_21] Caused by: java.lang.IllegalStateException: BaseTransaction.checkTransactionState - ARJUNA016051: thread is already associated with a transaction! at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.checkTransactionState(BaseTransaction.java:257) at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.begin(BaseTransaction.java:59) ... 13 more I also tried both instances to also share the repository folder, both this is failing because it lockes the file Caused by: javax.jcr.RepositoryException: The repository home /home/calcacuervo/development appears to be in use since the file named .lock is locked by another process. at org.apache.jackrabbit.core.util.RepositoryLock.tryLock(RepositoryLock.java:166) Any idea on how could I do it? Thanks! Demian

12 years, 7 months

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Drools in a web application

by forsakendoll

I'm very new to drools. I know this question is really a noob question but please bear with me. I'm using Spring MVC and I want to integrate drools expert to my project. What I've done so far is to integrate the hello world sample of drools expert. But now what I want to do is: 1. Send a bean to the rules for it to evaluate. 2. Modify the bean depending on the rules 3. Send it back to the controller to make a response to the user. I was able to do the number 1. But for number 2 and 3. I don't know how to do it. I want to have a nested rule. But now I'm only capable of doing this rule: global String $test; rule "Excellent" when $m: FLTBean ( listeningScore > 85 ) $p: FLTBean ( listeningScore < 101 ) then $test = "Excellent"; System.out.println( $test ); end I don't know yet how can I make a nested rule. Please give me a simple example that a newbie like me can understand. -- View this message in context: http://drools.46999.n3.nabble.com/Drools-in-a-web-application-tp4026704.html Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 7 months

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rules-users November 2013