February 2010 - rules-users - Jboss List Archives

by Malinda Kaushalye

Hi All, How do I insert new facts/events to the working memory from RHS? rule "myrule" when //Some condition then //Create and Insert some new events/facts to the working memory end Cheers, Malinda

16 years

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Drools Guvnor problem after crash..

by Tharakesh Siddalingaiah

Hello, I am not able to see/edit rules in Drools Guvnor (5.0.0.M5) after JBoss crash. We are using SQL Server 2005 for the rules repository. This was working just fine for over a year now. After restarting the server, I was not able to see any of the rules. When I logged into Guvnor It said that repository appears to be new and asked if I wanted to install the samples. We restored the database to a previous dump and I was able to see the rules if I went in through categories. However, I can't see the rules under the Package view. I also can't build a package nor export the rules as XML. Nor can I search for rules from the Find tab. I have an XML export from a few days ago that looks good but we would loose the history of rule changes. Any ideas on how to get our Guvnor working? thanks, -tk Tharakesh Siddalingaiah Solution Architect GTO GIS Core Banking - PWM IT US Deutsche Bank AG Tel: +1 (410) 895 5275 Mob: +1 (410) 905 2169 tharakesh.siddalingaiah(a)db.com --- This communication may contain confidential and/or privileged information. If you are not the intended recipient (or have received this communication in error) please notify the sender immediately and destroy this communication. Any unauthorized copying, disclosure or distribution of the material in this communication is strictly forbidden. Deutsche Bank does not render legal or tax advice, and the information contained in this communication should not be regarded as such.

16 years

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Re: [rules-users] guvnor - dsl rule editor - using ":" in text box

by John Walker

I also have a similar [then] DSL which is trying to set a value. Looks like: [then]Set summary to {summary}=... code here ... As expected, the same problem occurs. Is there a workaround for these two scenarios? Can I set a regex on the DSL for the [when] and [then]? Like: [when]- and var9 matches {v9:.*}=field9!=null, field9 matches "{v9}" [then]Set summary to {summary:.*}=... code here ... I am not very familiar with regex inside the DSL variable placeholders. I've only just seen this in other forum posts. Thanks, John ----------------------------------------------------------------------- Tested it and this is a bug. I made a Jira for it so you can follow it. https://jira.jboss.org/jira/browse/GUVNOR-505 Toni John Walker wrote: > > All, > > > > I have a DSL sentence that looks like this: > > [when]- and var9 matches {v9}=field9!=null, field9 matches "{v9}" > > > > When using the Guvnor guided rule editor, I add the "- and var9 > > matches {v9}" DSL sentence to the rule, giving me a WHEN condition > > like this: > > - and var9 matches [text box] > > > > I want to put a URL in the text box, but anytime I use a value > > containing a colon":", > > I get a popup box with error message "The value [some value with a > > colon] is not valid for this field" > > > > Example: > > DSL in rule, using guvnor guided editor: "- and var9 matches > > [http://google.com]" > > Popup error message: "The value http://google.com is not valid for > > this field" > > > > What needs to happen to allow a value with a colon? I did not have > > this problem with drools4 and JBRMS. > > > > Thanks, > > John

16 years, 1 month

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getWorkingMemoryEntryPoint returns NULL

by Malinda Kaushalye

Dear All, It appears to be that the getWorkingMemoryEntryPoint() method returns NULL in my code given below. Note that EventProcessingOption = STREAM and ClockType = "realtime" if that is of any importance. Cheers, Malinda public class EventKnowledgeBase { private KnowledgeBase kbase = null; private StatefulKnowledgeSession ksession = null; private WorkingMemoryEntryPoint globalStream = null; public EventKnowledgeBase() throws Exception { super(); kbase = readKnowledgeBase(); ksession = kbase.newStatefulKnowledgeSession(); KnowledgeBaseConfiguration config = KnowledgeBaseFactory.newKnowledgeBaseConfiguration(); config.setOption( EventProcessingOption.STREAM ); KnowledgeSessionConfiguration kbSessionConfig = KnowledgeBaseFactory.newKnowledgeSessionConfiguration(); kbSessionConfig.setOption( ClockTypeOption.get("realtime") ); globalStream = ksession.getWorkingMemoryEntryPoint( "global" ); if(null == globalStream){ System.out.println("WorkingMemoryEntryPoint is Null"); //YEAH..! IT RETURNS NULL } } }

16 years, 1 month

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Negating a result

by djb

Hi, I've been playing with Drools for a few weeks now, using rule templates, but using mostly Java with eval(). I am now trying to re-write my program in DRL, (to get that sweet RETE working). I've got a situation where my rules are either "may not be" or "must be" in the condition. In Java, I work out everything assuming "may not be", and in the last line, return (negationMod ? result : !result); But in DRL... i'm a bit lost. I guess I'll have to split up the rule templates, one for "may not be" and one for "must be"? Is there a better way? Regards Daniel -- View this message in context: http://n3.nabble.com/Negating-a-result-tp212559p212559.html Sent from the Drools - User mailing list archive at Nabble.com.

16 years, 1 month

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guvnor - dsl rule editor - using ":" in text box

by John Walker

All, I have a DSL sentence that looks like this: [when]- and var9 matches {v9}=field9!=null, field9 matches "{v9}" When using the Guvnor guided rule editor, I add the "- and var9 matches {v9}" DSL sentence to the rule, giving me a WHEN condition like this: - and var9 matches [text box] I want to put a URL in the text box, but anytime I use a value containing a colon":", I get a popup box with error message "The value [some value with a colon] is not valid for this field" Example: DSL in rule, using guvnor guided editor: "- and var9 matches [http://google.com]" Popup error message: "The value http://google.com is not valid for this field" What needs to happen to allow a value with a colon? I did not have this problem with drools4 and JBRMS. Thanks, John

16 years, 1 month

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design patterns/common problems

by Mark Proctor

I've started to add some design patterns/common problems to a wiki page at codehaus. Please start adding more :) http://docs.codehaus.org/display/LOGICABYSS/Design+Patterns Current titles are: * Min or Max Values <http://docs.codehaus.org/display/LOGICABYSS/Min+or+Max+Values> * Policy Encapsulation <http://docs.codehaus.org/display/LOGICABYSS/Policy+Encapsulation> * Policy Chain Management <http://docs.codehaus.org/display/LOGICABYSS/Policy+Chain+Management> * Validating Derived Objects Before Insertion <http://docs.codehaus.org/display/LOGICABYSS/Validating+Derived+Objects+Be...> * Goals <http://docs.codehaus.org/display/LOGICABYSS/Goals> * Simulate the Passage of Time <http://docs.codehaus.org/display/LOGICABYSS/Simulate+the+Passage+of+Time> * Delayed Modifications <http://docs.codehaus.org/display/LOGICABYSS/Delayed+Modifications> Mark

16 years, 1 month

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Similar question: changing operator from < to >

by djb

Hi, I just asked a question about conditionally negating conditions, in the DRL... and this question is similar, since it comes down to the lack of a ternary operator. I have rules where "LINK_OPERATOR" is either representative of >, == or <. I am using a rule template, and the problem is that it's not the parameters that change, but the conditions themselves that change based on this LINK_OPERATOR. If I call a function, then my chances for the RETE constant time evaluation is shot. Since this is a very fundamental part of the rules, must I again split my rule template into 3 parts? Then with the negation option, I'll need to double that to 6 templates? And if I have more operators, I'll have to multiply that in too? So, if speed is important, should I split the template? Regards, Daniel -- View this message in context: http://n3.nabble.com/Similar-question-changing-operator-from-to-tp212583p... Sent from the Drools - User mailing list archive at Nabble.com.

16 years, 1 month

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Verifier Question

by J Michael Dean

Does anyone have a succinct example of using verifier on a DRL or knowledge base? This is a nice feature in Guvnor and I thought it should be easy in the Eclipse environment to create a simple plugin that would gobble up the knowledge base and spit out the report. Thanks. - Mike

16 years, 1 month

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Ruleflow diagram customization

by J Michael Dean

Playing around on Macintosh I selected Drools preference to allow customization of nodes in Drools rule flows, and after restart, the properties view then had a color attribute. Changing the color attribute has no effect on the diagram, but then I received an error during execution indicating that the color attribute was not permitted. I manually deleted this attribute and all was the same as before. Then I checked it out on a Windows machine which refused to open the rule flow because there was no toType on the constraints. (The Mac did not care). Went back and reproduced the behavior, which is that allowing customization and making a change in the color eliminated ALL references for toType="DROOLS_DEFAULT" in the rf file, and on the Windows platform, this was not readable. Am sure that this is a "feature in evolution" but perhaps the preferences dialog should be altered so as to not allow the user to commit this crime. J Michael Dean mdean77(a)comcast.net

16 years, 1 month

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rules-users February 2010