February 2007 - rules-users - Jboss List Archives

RE: [rules-users] logical 'not' - is there such a construct?

by Olenin, Vladimir (MOH)

Ok, great. Thanks, Edson. Vlad -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli Sent: 21 February 2007 12:01 To: Rules Users List Subject: Re: [rules-users] logical 'not' - is there such a construct? Vlad, It will result in exactly the same as removing the exists. So, you shall get not problem with that. In fact, we have a logic optimizer/transformer that does some transformations/optimizations and I will add that as a simple optimization. []s Edson Olenin, Vladimir (MOH) wrote: >In effect, is such construct is allowed now in 3.1M? > > not ( > exists MyObject2(field == 'value') > ) > >I'm just not sure what 'not' element as an 'existential operation' will do >in case it's passed 'boolean' result as an operand. Would it act as a >logical negation? I understand that the above construct can be simply >expressed by removing 'exists' altogether, but the problem is that the above >is the result of 'automatic template' generation (ie, there is a sequence of >columns with 'exists' and 'not' elements and in case there is only one such >element the generation might result in the above construct). > >Thanks, > >Vlad > > >-----Original Message----- >From: rules-users-bounces(a)lists.jboss.org >[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli >Sent: 20 February 2007 16:30 >To: Rules Users List >Subject: Re: [rules-users] logical 'not' - is there such a construct? > > No, the "not" conditional element is an existential operator, so the >meaning is what you expressed in your first example. I thought that was >what you were looking for, but apparently it is not. > I never heard about any construction capable of doing what you are >asking for in a rules engine... maybe someone else can throw some light >in... > > []s > Edson > >Olenin, Vladimir (MOH) wrote: > > > >>So, if used like that, 'not' does not have 'existential' meaning then, but >>simple 'negation'? I mean, the expression >> >> not MyObject(field == 'value') >> >>would still mean 'not exists', correct? Would the expression >> >> not (MyObject(field == 'value')) >> >>mean >> >> MyObject(field != 'value') >> >>then. In other worlds, "all objects OTHER then those matching the >>constraint"? >> >>Thanks. >> >>Vlad >> >>-----Original Message----- >>From: rules-users-bounces(a)lists.jboss.org >>[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli >>Sent: 20 February 2007 14:37 >>To: Rules Users List >>Subject: Re: [rules-users] logical 'not' - is there such a construct? >> >> Vlad, >> >>In 3.1M1 you can write: >> >>rule X >>when >>not ( >>MyObject( aaa == "bbb" ) and >>MyObject2( bbb == "aaa" ) >>) >>then >>// do something >>end >> >>But remember that variables bound inside the "not" block are not avaible >>in the consequence for obvious reasons. >> >>[]s >>Edson >> >>Olenin, Vladimir (MOH) wrote: >> >> >> >> >> >>>Hi, >>> >>>I wonder if there is logical 'not' operator (in the meaning of "!=" -> >>>'not equal') which can be applied to the whole rule? Eg: >>> >>>Rule x >>> >>>When >>> >>>! ( >>> >>>MyObject(aaa == "bbb") >>> >>>MyObject2(bbb == "aaa") >>> >>>) >>> >>>Then >>> >>>// do smth >>> >>>End >>> >>>Basically I'm looking for an operator to reverse the evaluation result >>>of the expression in the brackets. The use case: in my system all >>>rules are defined from 'rule passes' prospective, while the >>>application should take some action in case the rule is NOT passed >>>(ie, 'else' case). >>> >>>Any way to do that except reformulating the constraints themselves? >>> >>>Thanks, >>> >>>Vlad >>> >>>------------------------------------------------------------------------ >>> >>>_______________________________________________ >>>rules-users mailing list >>>rules-users(a)lists.jboss.org >>>https://lists.jboss.org/mailman/listinfo/rules-users >>> >>> >>> >>> >>> >>> >> >> >> >> > > > > -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3124-6000 Mobile: +55 11 9218-4151 JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

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Problems with Decision Table

by helidesai

Hello, I am using JBoss Rules 3.1.0M1. I am using the decision table. I don't know how we can check something like DateField <= currentDate? I have tried to put Today() in data column and in condition I have put DueDt <= $1. But this gives error that 'Unexpected Token' .Is there any way to put current date like new Date() in Dicision table. Also I noticed that the 'Or' condition doesn't work properly. For example if i have to enter the condition like "Policy is Live or Policy is Cancelled" do this 'Msg'. I have to repeat the Action (Msg) field for both the rows with live and cancelled. Is there any other way to implement 'Or'? Another thing is can we use the condition without passing the data field? For example if I put DueDt <= new java.util.Date() in condition table and no fields in data column, will it work? Please let me know. Regards, Heli. -- View this message in context: http://www.nabble.com/Problems-with-Decision-Table-tf3267439.html#a9083103 Sent from the drools - user mailing list archive at Nabble.com.

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RE: [rules-users] conditional insert of 'exist' or 'not' keywords in decision table s

by Olenin, Vladimir (MOH)

Hi, Steve, --- I can certainly look at adding some extra config options to the listeners to allow an end row/column to be specified. I'm not sure the other things would be useful to many people (correct me if I'm wrong). --- That definitely would be useful. As to the 'data driven template selection', I don't know if many people ran into such use cases or not. One thing for sure, the data model in Excel spreadsheet can be simplified to a great degree for many applications if one can select appropriate rule template for particular rule (meaning, the columns or combination of columns can mean slightly different things for each row). It's somewhat similar to the MVC pattern, where Model - is data in Excel spreadsheet, View - the rule tempaltes in drl file. The thing that is 'missing' (or not quite missing - it's not very flexible and does not depend on the data submitted) is the data driven Controller. Right now the 'Controller' is driven from the 'outside' by 'hardcoded' links between data and template (hardcoded in a sense that someone has to define which template goes with which model). The rule template 'data' can not be applied to any rule template, but just to the template it was supposed to be used with. It seems like it might be good to maintain this dependency right with the rule data. If you would have time to make the modification (indicate end column/row) that would help to achieve such functionality (I'll write the preprocessing module and submit it here when/if I eventually get to it). Yet even more powerful concept might be to be able to define 'rule template name' within the same 'rule template' file vs a separate rule template file. The implementation might be a bit more involved though... Thanks! Vlad _____ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Steven Williams Sent: 20 February 2007 22:25 To: Rules Users List Subject: Re: [rules-users] conditional insert of 'exist' or 'not' keywords in decision table s Hi Vlad, I can certainly look at adding some extra config options to the listeners to allow an end row/column to be specified. I'm not sure the other things would be useful to many people (correct me if I'm wrong). If you do go down the preprocessing option you could use JXL instead of POI as you will already have a dependency on it for the drools decision table stuff. I'm not sure why we changed from POI to JXL but I have found it very easy to use. cheers Steve On 2/21/07, Olenin, Vladimir (MOH) <Vladimir.Olenin(a)moh.gov.on.ca <mailto:Vladimir.Olenin@moh.gov.on.ca> > wrote: Hi, Steve. That might help, though will require one 'external' run over the spreadsheet (ie, open Excel through POI and read some column with rule template names) or a separate config file which matches rules with appropriate templates. Regarding the ExternalSheetListener constructor, is there a way to set the number of records to read? From what I see (the API call), the l1 will process the same data as l2 does (when the compiler will get to row '30') and the data for the second template might not be very applicable for the first template. Basically, the thing is starting from row 30 the data merged with template 1 might generate invalid rules which is not desirable. Any way to avoid it? The main reason such functionality is required in the first place (in our project at least) is that for some use cases the same data can mean slightly different things and should result in slightly different rules. The number of such 'groups' is quite large to split the 'rule data' into separate spreadsheets and the differences between the data interpretation are quite significant for coming up with some 'generic' data format (which could suit all rule 'groups'). There is definitely a bunch of workarounds that can be done, but most of them would require Excel spreadsheet preprocessing. Within the existing API (from the example you attached) Excel preprocessing might be the easiest thing to do. Unless there is some more low level API which allows to insert 'interceptor' which would monitor each record that is being read by compiler and create new listener if appropriate entry is found in the particular column (eg, one column in the spreadsheet might have template name entry which remains the same for all records below unless changed to a new value)..... Smth along those lines :-) . Thanks, Steve. Vlad _____ From: rules-users-bounces(a)lists.jboss.org <mailto:rules-users-bounces@lists.jboss.org> [mailto:rules-users-bounces@lists.jboss.org <mailto:rules-users-bounces@lists.jboss.org> ] On Behalf Of Steven Williams Sent: 19 February 2007 18:54 To: Rules Users List Subject: Re: [rules-users] conditional insert of 'exist' or 'not' keywords in decision table s Hi Vlad, There is a very basic wiki page on it (http://wiki.jboss.org/wiki/Wiki.jsp?page=DecisionTableTemplates <http://wiki.jboss.org/wiki/Wiki.jsp?page=DecisionTableTemplates> ). In terms of the functionality you mention you have your data having knowledge of the rule templates whereas the current implementation is such that the data has no knowledge of the templates. You can apply multiple rule templates to the same data however (as in ExternalSpreadsheetCompilerIntegrationTest): final ExternalSpreadsheetCompiler converter = new ExternalSpreadsheetCompiler(); final List listeners = new ArrayList(); ExternalSheetListener l1 = new ExternalSheetListener(10, 3, "/templates/test_pricing1.drl"); listeners.add(l1); ExternalSheetListener l2 = new ExternalSheetListener(30, 3, "/templates/test_pricing2.drl"); listeners.add(l2); converter.compile("/data/ExamplePolicyPricing.xls", InputType.XLS, listeners); This example assumes two sets of data in the one sheet, however they could both have been applied to the same set (ie. the second listener could also point to row 10, column 3). Would that accomplish what you need? Steve On 2/20/07, Olenin, Vladimir (MOH) < Vladimir.Olenin(a)moh.gov.on.ca <mailto:Vladimir.Olenin@moh.gov.on.ca> > wrote: Thanks, Steve. That really seems to do the trick. Are there any wiki pages on this new functionality? Or for now one should refer to the source code & unit tests? I also wonder what other functionality the new templating engine has? Is it possible to define different 'types' of rules in the same 'rule' template and refer to these types from 'Excel' data fields (eg, have one column per rule where you can refer 'rule template XXX' from drl file; this value can override some default value for example). If not, how such situations can be handled? (ie, when one needs several type of rules driven by the same data?) Thanks, Vlad _____ From: rules-users-bounces(a)lists.jboss.org <mailto:rules-users-bounces@lists.jboss.org> [mailto:rules-users-bounces@lists.jboss.org <mailto:rules-users-bounces@lists.jboss.org> ] On Behalf Of Steven Williams Sent: 17 February 2007 04:25 To: Rules Users List Subject: Re: [rules-users] conditional insert of 'exist' or 'not' keywords in decision table s Hi Vlad, With the new decision table handling you could use the following template to do it: Given a table as follows: exists, 21, 25 , comprehensive not, 64, 100 exists, comprehensive the following template does what you want: template header driver[] policy[] package This_is_a_ruleset; #generated from Decision Table import example.model.Driver; import example.model.Policy ; template "Driver policy" driver policy rule "driver policy $row.rowNumber$" when $driver0$ Driver(age >= $driver1$, age <= $driver2$) $policy0$ Policy(type = "$policy1$") then //do smth end end template the code to call it was: public void testColumnKeywords() { final ExternalSpreadsheetCompiler converter = new ExternalSpreadsheetCompiler(); final String drl = converter.compile( "/data/TestWorkbook.xls", "/templates/test_keywords.drl", InputType.XLS, 1, 1 ); // DT starts at Row 1, Column 1 System.out.println(drl); } cheers Steve On 2/17/07, Olenin, Vladimir (MOH) < Vladimir.Olenin(a)moh.gov.on.ca <mailto:Vladimir.Olenin@moh.gov.on.ca> > wrote: 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 _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users <https://lists.jboss.org/mailman/listinfo/rules-users> -- Steven Williams Supervising Consultant Object Consulting Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501 stevenw(a)objectconsulting.com.au <mailto:stevenw@objectconsulting.com.au> www.objectconsulting.com.au <http://www.objectconsulting.com.au> consulting | development | training | support our experience makes the difference _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users <https://lists.jboss.org/mailman/listinfo/rules-users> -- Steven Williams Supervising Consultant Object Consulting Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501 stevenw(a)objectconsulting.com.au <mailto:stevenw@objectconsulting.com.au> www.objectconsulting.com.au <http://www.objectconsulting.com.au> consulting | development | training | support our experience makes the difference _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users <https://lists.jboss.org/mailman/listinfo/rules-users> -- Steven Williams Supervising Consultant Object Consulting Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501 stevenw(a)objectconsulting.com.au <mailto:stevenw@objectconsulting.com.au> www.objectconsulting.com.au <http://www.objectconsulting.com.au> consulting | development | training | support our experience makes the difference

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Null Checks

by Ronald R. DiFrango

All, I am in the process of migrating my rules from the 2.1 format to the 3.0.5format and I was wondering if the new version automatically does Null checks. For example I have the following: <java:condition>contact.getAccessoriesSelection() != null</java:condition> <java:condition>contact.getAccessoriesSelection().getAccessoriesTotal() != null</java:condition> I was wondering if under the new set I could do the following: rule "total calc" when contact : Contact(accessoriesSelection.accessoriesTotal != null) then # Add to the total end Ron

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How to stop rules

by Labuhn

Hello, i want to stop the rule engine when some spezial rules fire. I am working for rules for an online shop. The Problem (example) A rule finds out that we cannot put a book into the onlineshop besause the price is to low, not defined, ....! These rule has a high salience. When this happends we can stop going on and create an error. In javacode i can write my one exception and and throw it. But what can i do in Jboss Rule? Regards & Thanks Stefan

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Problem in Defining Rules

by Niyas

I am trying to use Drools with Spring-Hibernate. I don't know whether it's a proper way of using Drools with Spring and Hibernate. I am having the MVC application in Spring. This MVC application is having the form for adding the employee id and employee name. I have a bean for Employee. And EmployeeContoller using SimpleFormController in Spring. And I am having the DAO Interface with two methods addEmp(Employee e) and displayEmp(empid) and the implementation for this interface in Hibernate. What I am trying to do is, I am checking a conditon in .drl file, if it satisfies the condition in the then part I need to save the employee bean into database. My DRL: package com.example; import com.example.EmployeeBean; rule "My First Rule" when a:EmployeeBean(empName == "Andrew") then System.out.println("Hi Andrew -- My First Rule is Fired Successfully!!"); a.getempDAOTarget().addEmp(a); end But I am getting the following error: It's Endowment Policy -- My First Rule is Fired Successfully!! java.lang.NullPointerException at com.example.Rule_My_First_Rule_0.consequence(Rule_My_First_Rule_0.java:9) at com.example.Rule_My_First_Rule_0ConsequenceInvoker.evaluate(Rule_My_First_Rule_0ConsequenceInvoker.java:22) at org.drools.common.DefaultAgenda.fireActivation(Unknown Source) at org.drools.common.DefaultAgenda.fireNextItem(Unknown Source) at org.drools.common.AbstractWorkingMemory.fireAllRules(Unknown Source) at org.drools.common.AbstractWorkingMemory.fireAllRules(Unknown Source) at com.example.PolicyController.onSubmit(PolicyController.java:41) at org.springframework.web.servlet.mvc.SimpleFormController.onSubmit(SimpleFormController.java:356) at org.springframework.web.servlet.mvc.SimpleFormController.processFormSubmission(SimpleFormController.java:258) at org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:249) at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153) at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:44) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:723) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:663) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:394) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:358) at javax.servlet.http.HttpServlet.service(HttpServlet.java:709) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595)

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RE: [rules-users] logical 'not' - is there such a construct?

by Olenin, Vladimir (MOH)

Well, probably to rephrase it, what is the status / thoughts on 'else' construct for rules? Basically global 'logical' not for rules would be the 'else' branch of conditional statement (if DROOLS had one), correct? I've read some postings regarding this shortly after I joined the list (ie, around a month ago). I wonder if that discussion went anywhere.... To clarify, I do need the _logical_ not, NOT exisitential. So that the constructs with logical 'not' would select an 'inverse' fact tuples, ie, tuples for facts that did not the condition.... Kind of simple logical statement transformation in boolean algebra (DeMorgan law?...): MyObject( field == 'value' ) and MyObject2( field == 'value' ) ---> !( MyObject( field != 'value' ) or MyObject2( field != 'value' ) ) If '!' would mean "ALL TUPLES FOR FACTS IN THE RULE" XOR "SELECTED TUPLES", would the above conditions select the same set of tuples? I assume the engine should just 'expand' any such 'logical not' operands to move it into the coluimn constraints?.. I might be confusing smth though.... On the second thought for my particular case 'existential' not should work too, so I guess the above is just a possible extention of functionality. It really has nothing to do with the rule engine itself (from what I see), but rather transformation of the logical expressions before they are feeded into the rules engine. Thanks for the answers, Edson. Vlad -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli Sent: 20 February 2007 16:30 To: Rules Users List Subject: Re: [rules-users] logical 'not' - is there such a construct? No, the "not" conditional element is an existential operator, so the meaning is what you expressed in your first example. I thought that was what you were looking for, but apparently it is not. I never heard about any construction capable of doing what you are asking for in a rules engine... maybe someone else can throw some light in... []s Edson Olenin, Vladimir (MOH) wrote: >So, if used like that, 'not' does not have 'existential' meaning then, but >simple 'negation'? I mean, the expression > > not MyObject(field == 'value') > >would still mean 'not exists', correct? Would the expression > > not (MyObject(field == 'value')) > >mean > > MyObject(field != 'value') > >then. In other worlds, "all objects OTHER then those matching the >constraint"? > >Thanks. > >Vlad > >-----Original Message----- >From: rules-users-bounces(a)lists.jboss.org >[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli >Sent: 20 February 2007 14:37 >To: Rules Users List >Subject: Re: [rules-users] logical 'not' - is there such a construct? > > Vlad, > >In 3.1M1 you can write: > >rule X >when >not ( >MyObject( aaa == "bbb" ) and >MyObject2( bbb == "aaa" ) >) >then >// do something >end > >But remember that variables bound inside the "not" block are not avaible >in the consequence for obvious reasons. > >[]s >Edson > >Olenin, Vladimir (MOH) wrote: > > > >>Hi, >> >>I wonder if there is logical 'not' operator (in the meaning of "!=" -> >>'not equal') which can be applied to the whole rule? Eg: >> >>Rule x >> >>When >> >>! ( >> >>MyObject(aaa == "bbb") >> >>MyObject2(bbb == "aaa") >> >>) >> >>Then >> >>// do smth >> >>End >> >>Basically I'm looking for an operator to reverse the evaluation result >>of the expression in the brackets. The use case: in my system all >>rules are defined from 'rule passes' prospective, while the >>application should take some action in case the rule is NOT passed >>(ie, 'else' case). >> >>Any way to do that except reformulating the constraints themselves? >> >>Thanks, >> >>Vlad >> >>------------------------------------------------------------------------ >> >>_______________________________________________ >>rules-users mailing list >>rules-users(a)lists.jboss.org >>https://lists.jboss.org/mailman/listinfo/rules-users >> >> >> >> > > > > -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3124-6000 Mobile: +55 11 9218-4151 JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

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Mapping (or converting) RuleML to .drl file

by venkatesh devalapura nagabhushana

Hi, Is it possible to map / convert RuleML to a .drl file ? If it is not supported currently, is there a plan to do so in future releases of JBoss Rules ? Let me know. 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

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A question regarding licensing

by Marcus Ilgner

Hello list, I'm somewhat confused about how to license my software. I have made a couple of searches on the net, but could not come up with any good solution. That's the situation: JBoss Rules is licensed under the Apache License. It does, however contain Eclipse compiler components, which are licensed under the EPL. My project also builds upon the Eclipse RCP, which is EPL, too. Now I'm uncertain under which license I can or must release my software. Is it Apache License (from what I understand after my research, it is the more restrictive one of the two), or could I release under EPL, too? It is especially unclear to me if I did create a derivative work of JBoss Rules or even Eclipse, since I did not modify any of its code, I'm only using the product in my project. I'd be grateful for any enlightenment or weblinks to information on that matter. Best regards Marcus

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Recursion problem due to modify an object.

by KAPX

Hi, I am explaining the scenerio of recursion problem which I am facing. I have three rules in a ruleset. rule "gst_rate_ol" no-loop true salience 50 when QuoteUpdater:QuoteUpdater() eval(QuoteUpdater.getCustomerTypeCountry().equals("New Zealand") && QuoteUpdater.isFinanceLease() == true || QuoteUpdater.isRental() == true || QuoteUpdater.isOperatingLease() == true || QuoteUpdater.isHirePurchase() == true) then System.out.println("1"); TEMP = BigDecimal . valueOf ( 0.125 ) ; QuoteUpdater . setQuoteLevelGSTRate ( BigDecimal . valueOf ( TEMP . doubleValue ( ) ) ) ; modify(QuoteUpdater); end rule "NZ_SD" no-loop true salience 45 when QuoteUpdater:QuoteUpdater() eval(QuoteUpdater . getCustomerTypeCountry ( ).equals("New Zealand")) then System.out.println("2"); QuoteUpdater . setQuoteLevelGSTStreamRate ( BigDecimal . valueOf ( 0 ) ) ; QuoteUpdater . setQuoteLevelStampDutyRate ( BigDecimal . valueOf ( 0 ) ) ; GL_SD_Amt = BigDecimal . valueOf ( 0 ) ; QuoteUpdater . setQuoteLevelStampDutyAmount ( BigDecimal . valueOf ( 0 ) ) ; modify(QuoteUpdater); end rule "gst_stream_rate_ol" salience 40 no-loop true when QuoteUpdater:QuoteUpdater() eval(QuoteUpdater.getCustomerTypeCountry().equals("New Zealand") && QuoteUpdater.isRental() == true || QuoteUpdater.isOperatingLease() == true) then System.out.println("3"); TEMP = BigDecimal . valueOf ( 0.125 ) ; QuoteUpdater . setQuoteLevelGSTStreamRate ( BigDecimal . valueOf ( TEMP . doubleValue ( ) ) ) ; modify(QuoteUpdater); end while executing this ruleset a problem of recursion is occouring due to modify statement. To resolve this problem I have made some changes in drools code. I am explaining about the changes which I have made. some changes in following functions. Class: DefaultAgenda public boolean fireNextItem(final AgendaFilter filter) throws ConsequenceException { final AgendaGroupImpl group = (AgendaGroupImpl) getNextFocus(); // return if there are no Activations to fire if ( group == null ) {return false;} final AgendaItem item = (AgendaItem) group.getNext(); if ( item == null ) {return false;} item.getRule().setFired(true); if ( filter == null || filter.accept( item ) ) {fireActivation( item );} return true; } Class: TerminalNode public void assertTuple(final ReteTuple tuple,final PropagationContext context,final ReteooWorkingMemory workingMemory,final boolean fireActivationCreated) { // if the current Rule is no-loop and the origin rule is the same then // return if ( this.rule.getNoLoop() && this.rule.equals( context.getRuleOrigin() ) ) {return;} if(this.rule.isFired()) return; final InternalAgenda agenda = (InternalAgenda) workingMemory.getAgenda(); Class: Rule one attribute added name fired. (type boolean). By making these changes i am able to execute a rule single time only even whether there is any modify statement in rule. Please give your suggestion and feedback on this approach or avioding the recusrion problem. Thanks in advance. Kapil -- View this message in context: http://www.nabble.com/Recursion-problem-due-to-modify-an-object.-tf326558... Sent from the drools - user mailing list archive at Nabble.com.

17 years, 9 months

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rules-users February 2007