[rules-users] Dynamic rule loading
Esteban Aliverti
esteban.aliverti at gmail.com
Wed Jun 16 08:49:55 EDT 2010
Which version of drools are you using?
I don't see org.drools.builder.impl.KnowledgeBuilderProviderImpl in the
trunk.
Best,
On Wed, Jun 16, 2010 at 9:33 AM, Fnu Mahalakshmi <FMahalakshmi at nyx.com>wrote:
> Hi,
> Yes I added the drools-compiler as a dependency.
> I have added all the required jars to my classpath.
> Any other error???
> Thanks
> M
>
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> Today's Topics:
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> 1. Re: Dynamic Rule Loading (Esteban Aliverti)
> 2. Re: rule error (Esteban Aliverti)
>
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 16 Jun 2010 09:21:13 -0300
> From: Esteban Aliverti <esteban.aliverti at gmail.com>
> Subject: Re: [rules-users] Dynamic Rule Loading
> To: Rules Users List <rules-users at lists.jboss.org>
> Message-ID:
> <AANLkTil7CJpWIhO_eodIWM7vpgIS8NDzPyAP2Hx67JqO at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Are you including drools-compiler as a dependency?
>
> On Tue, Jun 15, 2010 at 5:28 PM, Fnu Mahalakshmi <FMahalakshmi at nyx.com
> >wrote:
>
> > Hi,
> >
> > I was trying to use knowledge builder package for dynamic loading of the
> > rule files. Getting major errors.
> >
> > My knowledge builder basically adds the rule resources from the
> > change-set.xml file which I have in my project directory.
> >
> > I am using the knowledge agent and knowledge base to add all the packages
> > loaded from my change-set xml file.
> >
> > Am I wrong somewhere???
> >
> > My code is as follows:
> >
> >
> > private KnowledgeBase loadRules(String[] rules) throws Exception{
> >
> > KnowledgeBuilder kbuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder();
> > kbuilder.add( ResourceFactory.newClassPathResource(
> > "/change-set.xml", getClass() ),
> > ResourceType.CHANGE_SET );
> > if ( kbuilder.hasErrors() ) {
> > System.err.println( kbuilder.getErrors().toString() );
> > }
> > KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent(
> > "MyAgent" );
> > kagent.applyChangeSet(
> > ResourceFactory.newClassPathResource("/change-set.xml", getClass()));
> > KnowledgeBase kbase = kagent.getKnowledgeBase();
> > kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
> >
> > return kbase;
> > }
> >
> > my change-set.xml is as follows:
> >
> > <?xml version="1.0" encoding="UTF-8"?>
> > <change-set xmlns='http://drools.org/drools-5.0/change-set'
> > xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
> > xs:schemaLocation='drools-change-set-5.0.xsd' >
> > <add>
> > <resource source='src/main/rules/' type='DRL' />
> > </add>
> > </change-set>
> >
> > I am getting the following error stack when I run:
> >
> > Exception in thread "main" org.drools.ProviderInitializationException:
> > Provider org.drools.builder.impl.KnowledgeBuilderProviderImpl could not
> be
> > set.
> > at
> >
> org.drools.builder.KnowledgeBuilderFactory.loadProvider(KnowledgeBuilderFactory.java:111)
> > at
> >
> org.drools.builder.KnowledgeBuilderFactory.getKnowledgeBuilderProvider(KnowledgeBuilderFactory.java:101)
> > at
> >
> org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:29)
> > at com.org.RuleRunner.loadRules(RuleRunner.java:58)
> > at com.org.RuleRunner.runStatelessRules(RuleRunner.java:127)
> > at com.org.RulesTest.main(RulesTest.java:40)
> > Caused by: java.lang.ClassNotFoundException:
> > org.drools.builder.impl.KnowledgeBuilderProviderImpl
> > at java.net.URLClassLoader$1.run(Unknown Source)
> > at java.security.AccessController.doPrivileged(Native Method)
> > at java.net.URLClassLoader.findClass(Unknown Source)
> > at java.lang.ClassLoader.loadClass(Unknown Source)
> > at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
> > at java.lang.ClassLoader.loadClass(Unknown Source)
> > at java.lang.ClassLoader.loadClassInternal(Unknown Source)
> > at java.lang.Class.forName0(Native Method)
> > at java.lang.Class.forName(Unknown Source)
> > at
> >
> org.drools.builder.KnowledgeBuilderFactory.loadProvider(KnowledgeBuilderFactory.java:108)
> > ... 5 more
> >
> >
> > The error comes exactly at the start where I call knowledge builder.
> > Please help!!
> >
> > Thanks
> > M
> >
> > Please consider the environment before printing this email.
> >
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> Esteban Aliverti
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> ------------------------------
>
> Message: 2
> Date: Wed, 16 Jun 2010 09:24:05 -0300
> From: Esteban Aliverti <esteban.aliverti at gmail.com>
> Subject: Re: [rules-users] rule error
> To: Rules Users List <rules-users at lists.jboss.org>
> Message-ID:
> <AANLkTin7WWH2t8YETZvExSa9bGHwh7lqBvUYZgRobVIW at mail.gmail.com>
> Content-Type: text/plain; charset="windows-1252"
>
> I recommend you to read the manual first.
>
> 2010/6/16 Giovanni Motta <mottagio at gmail.com>
>
> > You have 2 options here:
> > status == ?yes" *||* status == "no"
> > status == ?yes" *||* == "no"
> >
> > 'or' connector is not applied on constraints, but on patterns.
> >
> > Regards
> >
> > 2010/6/16 Fnu Mahalakshmi <FMahalakshmi at nyx.com>
> >
> >> Hi,
> >>
> >>
> >>
> >> I want to just depict ?&&? and ?or? in my rules and did as follows:
> >>
> >>
> >>
> >> *rule* "Update value?
> >>
> >> *no-loop* *true*
> >>
> >> *when*
> >>
> >> $y :Y(name != "")
> >>
> >> $x: X(status != "")
> >>
> >> $z : Z( y == $y, x == $X,(status == ?yes" *or* status ==
> "no"
> >> ))
> >>
> >> *then*
> >>
> >> *modify*($z){};
> >>
> >>
> >>
> >> end
> >>
> >>
> >>
> >> The above does not work. Is it not valid to write as above??
> >>
> >> How else can I depict ?or? ? relation?
> >>
> >> *rule* "Update value"
> >>
> >> *no-loop* *true*
> >>
> >> *when*
> >>
> >> $y :Y(name != "")
> >>
> >> $x: X(status != "")
> >>
> >> $z : Z( y == $y, x == $X,(status == ?yes" *, *status == "no"
> >> ))
> >>
> >> *then*
> >>
> >> *modify*($z){
> >>
> >> setOutput($z)};
> >>
> >>
> >>
> >> end
> >>
> >>
> >>
> >>
> >>
> >> even this does not work.
> >>
> >>
> >>
> >> I also want to add all the values specific to this condition and just
> >> print them out in my output file.
> >>
> >> So I tried adding it to a list (which is done by setOutput().
> >>
> >> But here I keep getting multiple entries for the same value.
> >>
> >> For eg. {a,b,c } //are instances of type z
> >>
> >> They keep getting added again and again. Should it not process input
> only
> >> once????
> >>
> >>
> >>
> >>
> >>
> >> Please help.
> >>
> >>
> >>
> >> Thank you
> >>
> >> m
> >>
> >> ------------------------------
> >>
> >> *Please consider the environment before printing this email.*
> >>
> >> *Visit our website at http://www.nyse.com
> >>
> *****************************************************************************
> >>
> >> Note: The information contained in this message and any attachment to it
> >> is privileged, confidential and protected from disclosure. If the reader
> of
> >> this message is not the intended recipient, or an employee or agent
> >> responsible for delivering this message to the intended recipient, you
> are
> >> hereby notified that any dissemination, distribution or copying of this
> >> communication is strictly prohibited. If you have received this
> >> communication in error, please notify the sender immediately by replying
> to
> >> the message, and please delete it from your system. Thank you. NYSE
> >> Euronext. *
> >>
> >>
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users at lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >>
> >
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> >
>
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> Esteban Aliverti
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