February 2007 - rules-users - Jboss List Archives

by shilpa.raghavendra＠wipro.com

Hi, I need to know how garbage collection will happen in Drools. Because my system is taking too much time to execute the business logic. Please tell me how to rectify it? One more question I will generate the email content dynamically and send to the client but what will happening is it's taking same content for all mail I think the Last content. For example Through business rule it has generated three mails and it has to send to supervisor then all mail contains last main information like name, Address etc. Please tell me how to rectify it. I need to know how to assert two object of same type and refer then in .drl file. I need to know how to access string array. Regards Shilpa The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com

18 years

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Unable to compile JBoss Rules example code - HelloWorldExample.java

by venkatesh devalapura nagabhushana

Hi, I am unable to compile the example code for JBoss, could some body help me out how to go about compiling the example code ? Is there a document that explains the steps for compiling the example source code ? Please let me know. Following is the error I am getting while trying to compile HelloWorldExample.java: javac HelloWorldExample.java ---------- 1. ERROR in HelloWorldExample.java (at line 14) private static RuleBase readRule() throws Exception { ^^^^^^^^ RuleBase cannot be resolved to a type CLASSPATH=.:/home/dnv/smc/PolicyMgmt/drools-examples/src/main/java: $JAVALIB/org/drools:/usr/local/bin/jdk1.5.0_04:$JAVALIB: $JAVALIB/antlr-2.7.6.jar:$JAVALIB/antlr-3.0ea8.jar: $JAVALIB/commons-collections-3.1.jar:$JAVALIB/commons-io-1.1.jar: $JAVALIB/commons-jci-core-1.0-406301.jar: $JAVALIB/commons-jci-eclipse-3.2.0.666.jar: $JAVALIB/commons-jci-janino-2.4.3.jar:$JAVALIB/commons-lang-2.1.jar: $JAVALIB/commons-logging-api-1.0.4.jar:$JAVALIB/core-3.2.0.666.jar: $JAVALIB/janino-2.4.3.jar:$JAVALIB/jsr94-1.1.jar: $JAVALIB/junit-3.8.1.jar:$JAVALIB/jxl-2.4.2.jar: $JAVALIB/stringtemplate-2.3b6.jar:$JAVALIB/xml-apis-1.0.b2.jar: $JAVALIB/xpp3-1.1.3.4.O.jar: $JAVALIB/xstream-1.1.3.jar:/home/dnv/smc/PolicyMgmt/plugins/org.drools.ide_3.0.5.jar Thanks, Venkatesh The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com

18 years

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Unable to compile JBoss Rules example code - HelloWorldExample.java

by venkatesh devalapura nagabhushana

hi, I was trying to compile the example code that is provided with Jboss Rules - HelloWorldExample.java using javac. I got following errors even though i included the jar files in the class path, please let me know how to go about compiling the example: ERROR in HelloWorldExample.java (at line 33) private static RuleBase readRule() throws Exception { ^^^^^^^^ RuleBase cannot be resolved to a type ERROR in HelloWorldExample.java (at line 43) final PackageBuilder builder = new PackageBuilder(); ^^^^^^^^^^^^^^ PackageBuilder cannot be resolved to a type ---------- 7. ERROR in HelloWorldExample.java (at line 56) final RuleBase ruleBase = RuleBaseFactory.newRuleBase(); ^^^^^^^^ RuleBase cannot be resolved to a type - Venkatesh The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com

18 years

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RE: [rules-users] Subclasses matche superclasses problem.

by Neil Goldman

Oana, Although your example used a superclass/subclass relationship, the problem is not due to that relationship, You could just as well have written two CAR rules : "if a car's price is <20000, then risk of theft is low" "if a car has the stealth radar avoidance option, then risk of theft is high" You might be upset by the infinite loop, but there is no way to know how you would like to assess the theft risk of a car that satisfies BOTH conditions. Here are two ways you might deal with this. a) maybe neither of these conditions is really sufficient to determine the theft risk, but simply to influence that risk. The "then" part of the rule should just increment/decrement a value the accumulates the net risk. But don't have the increment/decrement also tell drools that the CAR was modified. b) maybe the rules are TOTALLY ORDERED in your analytical model, and the first rule that applies is the only one that matters. You can use SALIENCE in drools to capture ordering. If all the rules are in a single activation group, then only the highest salience match will actually run (at least, that is my understanding). Again, you must not tell drools that the CAR has been modified just because you set its theft assessment. _____ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of nicolae oana Sent: Friday, February 16, 2007 2:11 AM To: rules-users(a)lists.jboss.org Subject: [rules-users] Subclasses matche superclasses problem. Hi everybody, I have a class Car which is superclass for class ConvertibleCar, two rules (described below) and a ConvertibleCar fact in working memory that causes both rules to fire, resulting this way an unwanted change to the car`s attribute and an infinite loop. How do I evitate this problem: the specialization class fact to not match its superclass column in a rule? ConvertibleCar car =new ConvertibleCar(10000); rule "rule-1" when $car:Convertible() then $car.setPotentialTheftRating("high"); end rule "rule-2" when $car:Car(price<20000) then $car.setPotentialTheftRating("low"); end Best regards, Oana _____ The fish are biting. Get more visitors <http://us.rd.yahoo.com/evt=49679/*http://searchmarketing.yahoo.com/arp/ sponsoredsearch_v2.php?o=US2140&cmp=Yahoo&ctv=Q107Tagline&s=Y&s2=EM&b=50 > on your site using Yahoo! Search Marketing. <http://us.rd.yahoo.com/evt=49679/*http://searchmarketing.yahoo.com/arp/ sponsoredsearch_v2.php?o=US2140&cmp=Yahoo&ctv=Q107Tagline&s=Y&s2=EM&b=50 >

18 years

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using null in drools rulebase

by mike20043

hi everyone need a bit more help here. im currently attempting to write some rules into my rulesbase and can't seem to get the system to check if a variable is empty. i have tried using null as shown in the code below rule "small beak + small body + garden" when Beak(beak == "small beak", beak = null) && Body(body == "small body") Location(location == "garden") then ES.resultsmx("<p> ); ES.resultsmx( Robin </p>"); ES.resultsop(); end which dosent work but for some reason i am able to check if it is not null by doing this rule "small beak + small body + garden" when Beak(beak == "small beak", beak != null) && Body(body == "small body") Location(location == "garden") then ES.resultsmx("<p> ); ES.resultsmx( Robin </p>"); ES.resultsop(); end I have tired using == null but this returns a false and the rule dosent run. can anyone help me please. Also if anyone has any knowledge of how to write rules so it only outputs one result instead of repeatedly running the conditions and outputting results for each correct condition and also how to check if a string variable contains a substring (within a rule) that would be greatly appreciated . Thanks in advance mike -- View this message in context: http://www.nabble.com/using-null-in-drools-rulebase-tf3244300.html#a9018648 Sent from the drools - user mailing list archive at Nabble.com.

18 years

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conditional insert of 'exist' or 'not' keywords in decision table s

by Olenin, Vladimir (MOH)

Hi, I wonder if it's possible to pass some Column keywords as parameters from template values, eg: Condition Condition $1 Driver $1 Policy age >= $2, age <= $3 type exists, 21, 25 , comprehensive not, 64, 100 exists, comprehensive I'd expect the above table would generate two rules like: Rule 1 When exists Driver (age >= 21, age <= 25) Policy(type == "comprehensive") Then // do smth End Rule 2 When not Driver (age >= 64, age <= 100) exists Policy (type == "comprehensive") then // do smth End The above example is just a mock up derived from one of the examples in the documentation to demonstrate the point (meaning, the rules themselves might not make sense from business point of view or can be implemented differently for this particular case). So, any way to achieve this? Whether in current version (3.0.x) or the upcoming release (3.2) Thanks, Vlad

18 years

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Thread safety of objects in working memory

by Faizan

I have a RulesEngine class which consists of single instance of a WorkingMemory and the RuleBase. In my application two threads access the working memory concurrently and assert/modify/retract my business objects (of same type/class). What will happen if one of the thread fires a rule which retracts an object while the other thread is working on that object? So my question is whether drools provide thread safety on the objects in working memory or do i need to handle it on my own by not allowing threads to access working memory at the same time. -- View this message in context: http://www.nabble.com/Thread-safety-of-objects-in-working-memory-tf324402... Sent from the drools - user mailing list archive at Nabble.com.

18 years

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RE: Eclipse 3.2.1 and Jboss Rules 3.0.5

by Uday Kamath

Just wanted to tell that I figured out the problem, it was eclipse by default uses JRE 1.5 and 3.0.5 is not compatible, if we change eclipse to use 1.4.2_10 or some flavor of jre 1.42 it works fine. -Uday -----Original Message----- From: Uday Kamath Sent: Thursday, February 15, 2007 3:55 PM To: 'Rules Users List' Subject: Eclipse 3.2.1 and Jboss Rules 3.0.5 Everything looks ok except when CTRL backspace for content assistance is used it throws this exception. Any one has any clue? java.lang.ClassCastException: org.eclipse.ui.internal.editors.text.JavaFileEditorInput at org.drools.ide.editors.completion.RuleCompletionProcessor.getDSLAdapter( RuleCompletionProcessor.java:549) at org.drools.ide.editors.completion.RuleCompletionProcessor.getCompletionP roposals(RuleCompletionProcessor.java:63) at org.drools.ide.editors.completion.AbstractCompletionProcessor.computeCom pletionProposals(AbstractCompletionProcessor.java:33) at org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionP roposals(ContentAssistant.java:1612) at org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProp osals(CompletionProposalPopup.java:473) at org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$17(C ompletionProposalPopup.java:470) at org.eclipse.jface.text.contentassist.CompletionProposalPopup$2.run(Compl etionProposalPopup.java:405) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67) at org.eclipse.jface.text.contentassist.CompletionProposalPopup.showProposa ls(CompletionProposalPopup.java:399) at org.eclipse.jface.text.contentassist.ContentAssistant.showPossibleComple tions(ContentAssistant.java:1441) at org.eclipse.jface.text.source.SourceViewer.doOperation(SourceViewer.java :777) at org.eclipse.jface.text.source.projection.ProjectionViewer.doOperation(Pr ojectionViewer.java:1519) at org.eclipse.ui.texteditor.TextOperationAction$1.run(TextOperationAction. java:131) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67) at org.eclipse.ui.texteditor.TextOperationAction.run(TextOperationAction.ja va:129) at org.eclipse.jface.action.Action.runWithEvent(Action.java:499) at org.eclipse.ui.commands.ActionHandler.execute(ActionHandler.java:185) at org.eclipse.ui.internal.handlers.LegacyHandlerWrapper.execute(LegacyHand lerWrapper.java:109) at org.eclipse.core.commands.Command.executeWithChecks(Command.java:461) at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(Paramet erizedCommand.java:424) at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerSe rvice.java:160) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchK eyboard.java:466) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.j ava:799) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(Workbench Keyboard.java:846) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.filterKeySequenceBindings (WorkbenchKeyboard.java:564) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.access$3(WorkbenchKeyboar d.java:506) at org.eclipse.ui.internal.keys.WorkbenchKeyboard$KeyDownFilter.handleEvent (WorkbenchKeyboard.java:122) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Display.filterEvent(Display.java:982) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:927) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:952) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:937) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:965) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:961) at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1275) at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:3346) at org.eclipse.swt.widgets.Control.windowProc(Control.java:3246) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4025) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1925) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2966) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:4 19) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActiva tor.java:78) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplicat ion(EclipseAppLauncher.java:92) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(Eclip seAppLauncher.java:68) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java: 400) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java: 177) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336) at org.eclipse.core.launcher.Main.basicRun(Main.java:280) at org.eclipse.core.launcher.Main.run(Main.java:977) at org.eclipse.core.launcher.Main.main(Main.java:952) -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Ho, Alan Sent: Thursday, February 15, 2007 12:07 PM To: Rules Users List Subject: RE: [rules-users] Short-circuit rules by group?! Sorry, I take back what I said about the previous email - when I was refering to agenda groups, I actually ment activation groups. But thinking about it more, I think activation groups might be a ok. Just makes sure that all rules in the activation group have the same consequence. Regards, Alan Ho -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Ho, Alan Sent: Wednesday, February 14, 2007 4:04 PM To: Rules Users List Subject: RE: [rules-users] Short-circuit rules by group?! I won't recommend using agenda groups in this case. If you want to make sure that a message is sent once and only once per customer, the predicate for each rule should look like : When customer : Customer() "Your custom business logic" && !customer.sentAEvent Then sendEventToCustomer customer.sentAEvent = true drools.assert(customer.sentAEvent) End This will ensure that only one event would get sent. Even if you use Agenda Groups, you can't prevent the LHS (condition statement) to be evaluated for every single rule. In the case where you have multiple rule's LHS are evaluted to be true, the "drools.assert" executed during the first valid rule would cause a revaluation of all rules that has "!customer.sentEvent" in its condition. When the re-evaluations reoccur, the !customer.sendAEvent is evaluated to false, hence a event is never sent twice to the customer. Agenda groups isn't a good idea because then your agenda groups is tightly tied to the data. You might end up creating more and more agenda groups for each customer. Does that make sense :P Regards, Alan Ho -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of jdepaul Sent: Tuesday, February 13, 2007 9:43 AM To: rules-users(a)lists.jboss.org Subject: [rules-users] Short-circuit rules by group?! I have several rules defined in groups by Customer, so I have number of rules for Walmart, some rules for NIKE, more rules for SomeCustomer... When one of the rules matches for a given customer I need to send an event notification. I need to make sure that I send only ONE event notification per Customer (regardless of how many rules were matched), thus after finding the very first match in the Walmart group, I'd like to activate a rule, and then short-circuit and "Skip" to the next group of rules for NIKE - to see if any of the matches are found in the next group. I've implemented this functionality using a Match object, which I assert into WorkingMemory whenever I find a match for customer, then all my rules check for absence of Match for given customer... This works, but I wonder if there is a better way to do it - using Agenda Groups, maybe - once I find ONE match for Walmart, skip to the next Agenda Group?! Could someone comment on this? THanks, James -- View this message in context: http://www.nabble.com/Short-circuit-rules-by-group-%21-tf3222142.html#a8 949165 Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

18 years

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Subclasses matche superclasses problem.

by nicolae oana

Hi everybody, I have a class Car which is superclass for class ConvertibleCar, two rules (described below) and a ConvertibleCar fact in working memory that causes both rules to fire, resulting this way an unwanted change to the car`s attribute and an infinite loop. How do I evitate this problem: the specialization class fact to not match its superclass column in a rule? ConvertibleCar car =new ConvertibleCar(10000); rule "rule-1" when $car:Convertible() then $car.setPotentialTheftRating("high"); end rule "rule-2" when $car:Car(price<20000) then $car.setPotentialTheftRating("low"); end Best regards, Oana --------------------------------- The fish are biting. Get more visitors on your site using Yahoo! Search Marketing.

18 years

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Special characters in rule parameter

by Rifflard Mickaël

Hi all, We have an issue when we want to use special characters in a rule parameter. For example, if we use french accents like é or è, the following exception is raised during drl file loading : line 1:8: unexpected char: 0xE9 at org.drools.semantics.java.parser.JavaLexer.nextToken(JavaLexer.java:611) at antlr.TokenBuffer.fill(TokenBuffer.java:69) at antlr.TokenBuffer.LA(TokenBuffer.java:80) at antlr.LLkParser.LA(LLkParser.java:52) at org.drools.semantics.java.parser.JavaRecognizer.unaryExpressionNotPlusMinus(JavaRecognizer.java:4778) at org.drools.semantics.java.parser.JavaRecognizer.unaryExpression(JavaRecognizer.java:4636) at org.drools.semantics.java.parser.JavaRecognizer.multiplicativeExpression(JavaRecognizer.java:4479) at org.drools.semantics.java.parser.JavaRecognizer.additiveExpression(JavaRecognizer.java:4419) at org.drools.semantics.java.parser.JavaRecognizer.shiftExpression(JavaRecognizer.java:4350) at org.drools.semantics.java.parser.JavaRecognizer.relationalExpression(JavaRecognizer.java:4216) at org.drools.semantics.java.parser.JavaRecognizer.equalityExpression(JavaRecognizer.java:4156) at org.drools.semantics.java.parser.JavaRecognizer.andExpression(JavaRecognizer.java:4119) at org.drools.semantics.java.parser.JavaRecognizer.exclusiveOrExpression(JavaRecognizer.java:4082) We are using Drools 2.5 with JDK 1.4. Is it possible to use special characters in a rule parameter ? If yes, what is our mistake ? Thanks a lot. Mickaël

18 years

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rules-users February 2007