March 2009 - rules-users - Jboss List Archives

by Benoit VILLAUMIE

Hello, I am using Drools engine 4.0.7 and Eclipse 3.3 drools plugin. I have a very basic/dumb problem but I do not understand where my error is : I have 2 rules --------------------------------- package poc import poc.FlashFact; *rule "HP one"* when FlashFact( homepage == "one"); then System.out.println("*** HP one"); end *rule "HP commons"* when FlashFact(); then System.out.println("*** … [View More]HP commons "); end ---------------------------------- I insert a FlashFact which homepage is set with "one" value. In my understanding, both rules "HP one" and "HP commons" should be fired. Instead, only "HP commons" is launched. I have compared with the Drools State example (which works fine), but I do not notice nothing. Thanks for your help. The code of the FlashFact class --------------------------------- package poc; public class FlashFact { public FlashFact() { this(null); } public FlashFact(String homepage) { this.setHomepage(homepage); } private String homepage; /** * @return the homepage */ public final String getHomepage() { return this.homepage; } /** * @param homepage the homepage to set */ public final void setHomepage(String homepage) { this.homepage = homepage; } } --------------------------------- The code of the launcher --------------------------------- package poc; import java.io.InputStreamReader; import org.drools.RuleBase; import org.drools.RuleBaseFactory; import org.drools.StatefulSession; import org.drools.audit.WorkingMemoryFileLogger; import org.drools.compiler.PackageBuilder; public class FlashUndeployedRulesMain { public static void main(String[] args) throws Exception { StatefulSession session = null; WorkingMemoryFileLogger logger = null; try { PackageBuilder builder = new PackageBuilder(); builder.addPackageFromDrl(new InputStreamReader( FlashUndeployedRulesMain.class.getClassLoader() .getResourceAsStream(RULE))); final RuleBase ruleBase = RuleBaseFactory.newRuleBase(); ruleBase.addPackage(builder.getPackage()); session = ruleBase.newStatefulSession(); logger = new WorkingMemoryFileLogger( session); logger.setFileName("log/flash"); // inserting facts FlashFact HPFrance = new FlashFact("one"); session.insert(HPFrance); session.fireAllRules(); } finally { if(session != null) {session.dispose();} if(logger != null) {logger.writeToDisk();} } } private static final String RULE = "poc/Flash.drl"; --------------------------------- [View Less]

15 years, 11 months

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Re: [rules-users] Begginner question about rule language

by Harsh Jetly

Hi , '$' signifies that its suffix is a binding to an object . It is optional , it just helps you to differentiate between the variables ,constants and bindings. -- View this message in context: http://www.nabble.com/Begginner-question-about-rule-language-tp18072183p1... Sent from the drools - user mailing list archive at Nabble.com.

15 years, 11 months

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using matches in a collection

by ygaurav

Hi All i am new to drools and I am hoping that some body can help me out here. I data in string array and I would like to check if one of the entry starts with the string I have. How can check it ? Code is shown below @java class ABC { String[] array = new String[]{"abcdef","ghijkl","mnopqrst"} } @drools rule "check something" when $abc : ( ABC.array contains a single entry which start with "abc" ) Is there a way I can do it ? If it is not possible what is way I can achive … [View More]

15 years, 11 months

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Backward chaining in drools 5?

by Alberto Cabas Vidani

I read the information available about drools 5, but support to backward chaining is never mentioned. Since in the documentation of Drools 4 it's said that it will be supported in the next major release I'm wondering wether it will be present in release 5. Does anyone know something about it? Alberto

15 years, 11 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). … [View More]

16 years

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high cpu usage

by techy

Hello My app is functioning consumer/producer model. 1.Producer reads the data from DB and inserts to blocking queue 2.Consumer reads the data from queue and execute the rules using drools stateless session. Both producer and consumer run asynchronously. in my testing I found the following 1. for 1000 facts at a time and no rules in drl, cpu usage is maintained at 25-30% in my PC(Intel core 2 CPU,2.13 GH,2G RAM) - with no rules in drl, Is this cpu usage acceptable? 2. for 1000 facts at a … [View More]

16 years

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ClassCastException when firing rules

by seemamani

hi, We are using Drools 4.0.7 in a web application deployed in WebSphere 6.1. Occasionally, we have rule engine failure caused by RuntimeDroolsException (whose root cause is shown as ClassCastException) when firing rules. Other times, the rules are executing without errors. Here is the stack trace of the exception. What are the possible reasons? Thanks, Seema org.drools.RuntimeDroolsException: Exception executing predicate eval( inventory.leaseInformation != null ) at org.drools.rule.… [View More]PredicateConstraint.isAllowed(PredicateConstraint.java:216) at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318) at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:145) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:162) at org.drools.reteoo.Rete.assertObject(Rete.java:175) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192) at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:911) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:883) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:684) at com.adesa.business.framework.rules.process.drools.ManagedStatefulSession.init(ManagedStatefulSession.java:87) at com.adesa.business.framework.rules.process.drools.ManagedStatefulSession.fireAllRules(ManagedStatefulSession.java:100) at com.adesa.business.framework.rules.process.drools.RuleEngineImpl.execute(RuleEngineImpl.java:60) at com.adesa.business.framework.rules.interceptor.RulesInterceptor.applyAnnotedRules(RulesInterceptor.java:109) at com.adesa.business.framework.rules.interceptor.RulesInterceptor.applyRules(RulesInterceptor.java:80) at sun.reflect.GeneratedMethodAccessor575.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:618) at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:597) at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:583) at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:60) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:629) at com.adesa.business.rules.RuleHandler$$EnhancerByCGLIB$$3ab6eda.fireUpdatePricing(<generated>) at com.adesa.business.auction.manager.SaleEventManagerImpl.updatePricing(SaleEventManagerImpl.java:2599) at com.adesa.business.auction.manager.SaleEventManagerImpl.cascadeAtEndOfAuction(SaleEventManagerImpl.java:1993) at com.adesa.business.auction.manager.SaleEventManagerImpl.cascadeAtEndOfGroundingSaleEventForHyundai(SaleEventManagerImpl.java:1783) at com.adesa.business.auction.manager.SaleEventManagerImpl.cascadeAtEndOfGroundingSaleEvent(SaleEventManagerImpl.java:1180) at com.adesa.business.auction.manager.SaleEventManagerImpl.cascadeAtEndOfGroundingSaleEvent(SaleEventManagerImpl.java:1134) at com.adesa.business.auction.service.AuctionServiceImpl.cascadeAtEndOfGroundingSaleEvent(AuctionServiceImpl.java:766) at sun.reflect.GeneratedMethodAccessor263.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:618) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:77) at com.adesa.business.framework.logging.LoggingInterceptor.profileLog(LoggingInterceptor.java:136) at sun.reflect.GeneratedMethodAccessor74.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:618) at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:597) at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:583) at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:60) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:50) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:54) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:50) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:54) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) at $Proxy58.cascadeAtEndOfGroundingSaleEvent(Unknown Source) at com.adesa.business.pricing.ejb.PricingBean.updateMBPPrice(PricingBean.java:112) at com.adesa.business.pricing.ejb.EJSRemoteStatelessPricing_a0966b04.updateMBPPrice(EJSRemoteStatelessPricing_a0966b04.java:183) at com.adesa.business.pricing.ejb._EJSRemoteStatelessPricing_a0966b04_Tie.updateMBPPrice(_EJSRemoteStatelessPricing_a0966b04_Tie.java:243) at com.adesa.business.pricing.ejb._EJSRemoteStatelessPricing_a0966b04_Tie._invoke(_EJSRemoteStatelessPricing_a0966b04_Tie.java:108) at com.ibm.CORBA.iiop.ServerDelegate.dispatchInvokeHandler(ServerDelegate.java:621) at com.ibm.CORBA.iiop.ServerDelegate.dispatch(ServerDelegate.java:474) at com.ibm.rmi.iiop.ORB.process(ORB.java:503) at com.ibm.CORBA.iiop.ORB.process(ORB.java:1571) at com.ibm.rmi.iiop.Connection.respondTo(Connection.java:2701) at com.ibm.rmi.iiop.Connection.doWork(Connection.java:2575) at com.ibm.rmi.iiop.WorkUnitImpl.doWork(WorkUnitImpl.java:62) at com.ibm.ejs.oa.pool.PooledThread.run(ThreadPool.java:118) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1473) Caused by: java.lang.ClassCastException: com.adesa.data.grounding.pojo.Inventory incompatible with com.adesa.data.grounding.pojo.Inventory$$EnhancerByCGLIB$$de81aab3 at ASMAccessorImpl_11448003161226563261710.getValue(Unknown Source) at org.mvel.ast.VariableDeepPropertyNode.getReducedValueAccelerated(VariableDeepPropertyNode.java:22) at org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:21) at org.mvel.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:21) at org.mvel.MVELRuntime.execute(MVELRuntime.java:90) at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111) at org.mvel.MVEL.executeExpression(MVEL.java:235) at org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:45) at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:209) -- View this message in context: http://www.nabble.com/ClassCastException-when-firing-rules-tp20694738p206... Sent from the drools - user mailing list archive at Nabble.com. [View Less]

16 years

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Trying to get Sliding Windows to work

by ober0n

Hi, I am having trouble understanding how to use sliding windows. Here are the relevant snippets of code I added to the Hello World example under Drools Fusion. I also added a timestamp to the Message class (with corresponding get and set functions). DroolsTest.java: for(int i=0; i < 6; i++) { Thread.sleep(10000); currDate = new Date(); Message message = new Message(); message.setMessage("Hello World"); message.setStatus(Message.HELLO); message.setTemporalStamp(currDate); ksession.… [View More]

16 years

5
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Drools flow and BPEL (Drools 5.0.0.M5)

by Umesh Wankhede

Hi I am trying to evaluate various features (rules and workflow) of Drools 5.0. What I understand from docs (drools-docs-flow.pdf - page 5) is that the Drools flow engine is based on generic process engine that allows the execution of different process languages like RuleFlow, BPEL, OSWorkflow, etc. Although I am able to do PoC (Proof of Concept) with RuleFlow, there isn't any documentation/samples available for using BPEL as process language. Also I don't find any more information on … [View More]

16 years

3
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Guvnor, database and rule language

by Anu＠work

I am trying to use drools to evaluate the following rule: Given a telephone number, if the telephone number already exists in database and has a balance > 0, set isAllowed = false. I cannot figure out how to write the rule. This is my object public class Customer implements Serializable { private static final long serialVersionUID = 1L; private String tn; private Double balance; private Boolean isAllowed; // getters/ setters } Can anyone help me with the rule below? … [View More]

16 years

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rules-users March 2009