June 2010 - rules-users - Jboss List Archives

Creating and deploying rules to Drools and JRules

by Varnit Khanna

Hi, What will be the best way to achieve the following: We are trying to create a simple web based interface which will allow our marketing team to create rules and then deploy them to either jrules or drools (depending on the client). Is there some standard "rules language" or library available to achieve this? Thanks, VK

3 days, 23 hours

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how to write regular expressions in drools..

by Nagaraju runkana

HI Guys, present i am using drools 4.0 in this case.now, i am writting some rules validation using regular expression ZIPCODE,EMAIL,CREDIT CARD number.like this.. -------------------- validation.dslr -------------------- rule "email.mandatory:[insert][update][ui]" when There is an Order Order email address checking for first letter then Reject with response : "email address must not start with @ " end rule "phone.mandatory:[insert][update][ui]" when There is an Order Order phone number format should checking then Reject with response : "The phone number you entered is not valid.Please enter a phone number with the format xxx-xxx-xxxx."\ end ----------------------- validation.dsl -------------------- [*][]Order email address checking for first letter= OrderBean(email matches "@[A-Za-z0-9]*") [*][]Order phone number format should checking=OrderBean( phone not matches "(/\d{3}\-\d{3}\-\d{4}/)==-1)") this rules are not working ...any one can help me.ASAP thanks, chanti

3 weeks, 2 days

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drools-solver results question

by Andrew Waterman

Hello, I'm starting to work with the drools-solver to help on a gaming project. Basically, we have a game that works in two modes: 1) a competitive game where humans (or agents) compete with one another on a well defined game board to achieve 24 points by using three (or four) agricultural development tokens. 2. A puzzle, where all 4 players work cooperatively to create an equitable solution, where all 4 players win with at least 24 points by means of our agricultural development tokens. I am starting to work with drools-solver to address the puzzle part of our game. Basically, we are interested in having the solver do two things for us: a) find the optimal solution for our game/puzzle, based upon our requirements [this part seems quite straightforward] and b) getting the total number of solutions that satisfy our constraints. We would like, as well, to be able to inspect these other, sub-optimal, solutions, in order to explore our game and puzzle further. From my reading of the "Solver" API , it looks like we will only be able to get the optimal solution. Does anyone have any suggestions for a workaround in this case? Or is there some functionality in the solver that I am missing? I look forward to your feedback. best wishes, Andrew --------------------------------- Andrew Waterman San Cristóbal de las Casas, Chiapas, Mexico

4 months, 1 week

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Need help with setFocus

by new2drools

Hi All, Need some help with understanding setFocus. I have the following use case: if (condition1) { if (condition2) { } else if (condition3) { } else if (condition 4) { } } if (condition5) { if (condition2) { } else if (condition3) { } else if (condition 4) { } } I created 3 rules (rule2, rule3, rule4) for checking condition2, condition3, condition4 and created 1 agenda group (groupX) for them. I created 2 rules (rule1, rule5) for checking condition1, condition5 and created 1 agenda group(groupY) for them. rule "rule1" agenda-group "groupY" when // then drools.setFocus("groupX"); end rule "rule3" agenda-group "groupX" activation-group "someActiveGroup" when // then // end >From the java code: ksession.getAgenda().getAgendaGroup("groupY").setFocus(); Problem: The first time, drools.setFocus("groupX") is invoked, I see that it's working fine. rule2 or rule3 or rule4 get triggered. But, the SECOND time that drools.setFocus("groupX") is invoked, I don't see that any rule in agenda-group groupX is being invoked...even though one of the rule's LHS explicitly matches...thinking that the activation-group is cancelling all the activation's (after one rule in that activation group is fired), I even removed the activation-group statement. But, it didn't help...ideally, I would like to bunch rule2, rule3, rule4 in one activation group. Can you please let me know as to why the second invocation of setFocus is not working? I even tried to remove everything in LHS of rule2/3/4, to see if the second invocation would work...it doesn't... Thanks!! -- View this message in context: http://www.nabble.com/Need-help-with-setFocus-tp24177742p24177742.html Sent from the drools - user mailing list archive at Nabble.com.

5 months

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conways game of life

by Mark Proctor

For anyone looking for a good and complex example on how to write rules properly, please look at Conways Game of Life in drools-examples, for extra bonus points compare it to the old version in M1. You'll see nearly all the logic is moved from java to the drl and we have removed the need for nested objects by using objects relaitionally, which also allows us to exploit cross products to drive the application. Mark

8 months, 3 weeks

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FW: Implementation of expert system

by Binyala, Krishna Gopal IN BLR SISL

Hello, I am new to drools community... I want to develop an expert system for medical application using drools. can you please let me know how to use history data in drools... Because as far as i know we have to keep all the data in the working memory to access. How should i implement such system? Would be better if you can provide some reference to existing expert system implemented using drools. Thanks in advance. Krishna Gopal In three words I can sum up everything I've learned about life: it goes on... Important notice:This e-mail and any attachment thereto contains corporate proprietary information. If you have received it by mistake, please notify us immediately by reply e-mail and delete this e-mail and its attachments from your system. Thank You.

13 years, 4 months

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enquiry on drools webservice

by Prem Kumar L

13 years, 7 months

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java.lang.OutOfMemoryError: Java heap space

by vdelbart

Hello, In my tests of the 4.0.3, I have some : java.lang.OutOfMemoryError. So, I try a simple test with 10.000 sequential execution of 1 rule with no context and just a workingmemorylogger and I have the error : java.lang.OutOfMemoryError: Java heap space My code is : public class ExecReglesMemotyTest { private static final Reader DRL = new InputStreamReader(ExecReglesMemotyTest.class .getResourceAsStream("/rules/exemple.drl")); private static final String FICHIER_LOG = "session"; /** * @param args */ public static void main(String[] args) { try { PackageBuilder builder = new PackageBuilder(); builder.addPackageFromDrl(DRL); RuleBase ruleBase = RuleBaseFactory.newRuleBase(); ruleBase.addPackage(builder.getPackage()); for (int i = 0; i < 10000; i++) { StatefulSession session = ruleBase.newStatefulSession(); WorkingMemoryFileLogger logger = new WorkingMemoryFileLogger(session); logger.setFileName(FICHIER_LOG); session.fireAllRules(); logger.writeToDisk(); session.dispose(); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } with this rule (doesn't matter): #created on: Fri Nov 09 15:48:45 CET 2007 package initPackage #list any import classes here. rule "ERG9" when then end I try this in 4.0.1, and it's working (no OutOfMemoryError) What's the problem ? thanks for any information, V. -- View this message in context: http://www.nabble.com/java.lang.OutOfMemoryError%3A-Java-heap-space-tf477... Sent from the drools - user mailing list archive at Nabble.com.

13 years, 8 months

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Problem with gateway(diverge) executing first

by Jian Feng Ng

13 years, 10 months

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Challenge! Using javassist and drools presents an issue with drl

by markricard

In order to make writing drl files easy and not requiring writers to be developers, I have written some JavaAssist code that dynamically creates a subclass and new methods in memory. If for example there is a REAL java class called 'com.foo.Instance'. Via javasssist, I create a new in-memory subclass called 'com.foo.InstanceEx'. The new class dynamically creates a new getter called getFoo(). The drl writer would like to directly reference 'foo' in the drl file like so: when i : Instance(foo == 'fee') The problem is, in order to reference foo, I would need the drl file to do this: import com.rrd.xspace.drools.InstanceEx; But I cannot do that because InstanceEx does not exist at runtime. The error I get, which is an obvious one, is "Unable to create Field Extractor for 'foo' of '[ClassObjectType class=com.foo.Instance]' in rule 'Test' : [Rule name='Test']" Is there a way to include a dynamic import of a JavaAssist class while I am constructing the KnowledgeBase instances to run the rules so that I can reference that new method? I would hope to have something similar to: KnowledgeBuilder kbuilder = .... kbuilder.addImport("com.foo.InstanceEx") or kbuilder.addClass(Class.forName("com.foo.InstanceEx")) Any help GREATLY appreciated. -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Challenge-Using-javas... Sent from the Drools - User mailing list archive at Nabble.com.

14 years, 1 month

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rules-users June 2010