[rules-users] Rule for Collection (Ashish Soni)
Vishwanath Dubey
vndube at gmail.com
Thu Aug 27 05:07:40 EDT 2009
YOu can use collect function. Please refer
http://blog.athico.com/2007/06/chained-from-accumulate-collect.html
On 8/26/09, rules-users-request at lists.jboss.org <
rules-users-request at lists.jboss.org> wrote:
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> Today's Topics:
>
> 1. Rule for Collection (Ashish Soni)
> 2. Using KnowledgeAgent with Stateful session (nestabur)
> 3. Re: Cannot view Process Definitions in gwt-console (rbms)
> 4. Re: Using KnowledgeAgent with Stateful session (James Owen)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 26 Aug 2009 12:22:55 -0400
> From: Ashish Soni <learnspring at gmail.com>
> Subject: [rules-users] Rule for Collection
> To: Rules Users List <rules-users at lists.jboss.org>
> Message-ID:
> <cf7a8a020908260922je3d0f9cie85eada146f594e9 at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi All ,
>
> Can someone please help how can i write a rule for below condition -
>
> I have Student object which contains List of Courses
>
> public Class Person
> {
> private List<Course> courseList;
> }
>
> public Class Course
> {
> private String name;
> private int duration;
> }
>
> Now lets say the list of course inside person object contains 10 course
> objects and if one of the course object contain name =="XYZ" and another
> contain a duration = 20 hours then how i can write a rule for this.
>
>
> Thanks.
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> ------------------------------
>
> Message: 2
> Date: Wed, 26 Aug 2009 09:34:33 -0700 (PDT)
> From: nestabur <nestabur at gmail.com>
> Subject: [rules-users] Using KnowledgeAgent with Stateful session
> To: rules-users at lists.jboss.org
> Message-ID: <25151447.post at talk.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
>
>
> Does anyone tried to use the knowledgeAgent with statefulSessions?
>
> I've tried to configure my rule engine obtaining unexpected behaviour.
>
> I configure my statefulSession as follows:
>
> wm = (ReteooStatefulSession) ((KnowledgeBaseImpl) kagent
>
> .getKnowledgeBase()).ruleBase.newStatefulSession(
> (SessionConfiguration) sessionConf, env);
> ksession = new StatefulKnowledgeSessionImpl(wm, kagent.getKnowledgeBase());
>
> And after updating the KnowledgeBase in the agent I update my ksession:
>
> wm.setRuleBase((InternalRuleBase) ((KnowledgeBaseImpl) kagent
>
> .getKnowledgeBase()).ruleBase);
> ksession = new StatefulKnowledgeSessionImpl(wm, kagent.getKnowledgeBase());
>
> Without using entry-points this approach works as expected, but using them
> it fails after the first update throwing the error:
>
> Exception while processing message: java.lang.NullPointerException
> java.lang.NullPointerException
> at
>
> org.drools.reteoo.ReteooFactHandleFactory.newFactHandle(ReteooFactHandleFactory.java:54)
> at
>
> org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:79)
> at
>
> org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:66)
> at
> org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:109)
> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:80)
> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:28)
>
> Browsing the drools core code I found the line that was throwing the
> exception and tried to get the same result by implementing:
>
> if (!((InternalRuleBase) ((KnowledgeBaseImpl)
> ksession.getKnowledgeBase()).ruleBase)
> .getTypeDeclaration(fact.getClass()) ==
> null)
> log.info (((InternalRuleBase) ((KnowledgeBaseImpl)
> ksession.getKnowledgeBase()).ruleBase)
>
> .getTypeDeclaration(fact.getClass()).getTimestampExtractor().toString());
>
> after updating my ksession. The result was the same, again the same
> exception thrown but my logger wrote:
> 18:01:50,232 INFO [ClassFieldExtractor class=MyPackage.MyFact
> field=myTimestampField]
>
> So I dont know why the core is throwing that exception, is that
> implementation correct?, any ideas?
>
>
> Thanks,
>
> Nestor
>
> --
> View this message in context:
> http://www.nabble.com/Using-KnowledgeAgent-with-Stateful-session-tp25151447p25151447.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 26 Aug 2009 11:37:55 -0700 (PDT)
> From: rbms <rbms at hotmail.com>
> Subject: Re: [rules-users] Cannot view Process Definitions in
> gwt-console
> To: rules-users at lists.jboss.org
> Message-ID: <25152800.post at talk.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
>
> Thanks for the reply Kris,
>
> I finally found the issue. When file is uploaded from guvnor, looks like
> the
> compile package bytes property is not set in the repo.
>
> So I had to invoke rebuildPackages function from
> org.drools.guvnor.server.ServiceImplementation.loadRuleAsset function
>
> thanks
> -Ramesh
>
>
> Kris Verlaenen wrote:
> >
> > Because the gwt-console does not allow you to specify which knowledge
> > package should be loaded (yet), it currently uses the "default" package.
> > Putting your rule flow in a package called "default" (and then building
> > that package in Guvnor) should solve your issue I think. You could also
> > change the name of the package to load in the changeset.xml file in
> > drools-gwt-console.
> >
> > Kris
> >
> > Quoting rbms <rbms at hotmail.com>:
> >
> >>
> >> I am trying to deploy drools-guvnor, gwt-console in Tomcat.
> >> I am using mysql for persistence.
> >> I uploaded the process definitions in drools-guvnor.(I can see them
> >> Packages
> >> --> defaultPackage --> RuleFlows)
> >> However when I try to view them in Processes --> Process Definitions
> >> -->
> >> Definition List, I cannot see them.
> >>
> >> Following is from tomcat server log.(with debugging statements that
> >> I
> >> added.)
> >>
> >> I placed debug statements in
> >> org.drools.guvnor.server.files.PackageDeploymentServlet.doGet method.
> >> This
> >> method calls
> >> org.drools.guvnor.server.files.FileManagerUtils.loadBinaryPackage
> >> method.
> >>
> >> //Following is the debug statement that I placed in
> >> org.drools.guvnor.server.files.FileManagerUtils.loadBinaryPackage
> >> method.
> >> public String loadBinaryPackage(String packageName,
> >> String packageVersion,
> >> boolean isLatest,
> >> OutputStream out) throws
> >> IOException {
> >> PackageItem item = null;
> >> if ( isLatest ) {
> >> item = repository.loadPackage( packageName );
> >> System.out.println("FileManagerUtils.loadBinaryPackage() ...");
> >> AssetItemIterator ai = item.queryAssets("drools:format='rf'",
> >> false);
> >> for (;ai.hasNext();) {
> >> Object o = ai.next();
> >> System.out.println("FileManagerUtils.loadBinaryPackage
> item = "
> >> +
> >> o.getClass() +":"+o);
> >>
> >>
> >
> System.out.println("*************************************************************************");
> >> }
> >>
> >> As you can see the servlet returns the rule flow.
> >>
> >> I also placed some debug statements in
> >> org.drools.rule.Package.readExternal
> >> method. As you can see when it comes to this method rule flow is
> >> empty.
> >>
> >> Because of this
> >> org.drools.integration.console.DroolsFlowCommandDelegate.getProcesses()
> >> function returns 0 process definitions.
> >>
> >> Can somebody help?
> >>
> >> ********************************************************
> >> [2009:08:231 22:08:625:debug] KnowledgeAgent rebuilding KnowledgeBase
> >> using
> >> ChangeSet
> >> [2009:08:231 22:08:625:debug] KnowledgeAgent building
> >> resource=[UrlResource
> >>
> > path='
> http://localhost:8081/drools-guvnor/org.drools.guvnor.Guvnor/package/defaultPackage/LATEST
> ']
> >> PackageName: defaultPackage
> >> //org.drools.guvnor.server.files.PackageDeploymentServlet.doGet -
> >> Begin
> >> PackageVersion: LATEST
> >> PackageIsLatest: true
> >> PackageIsSource: false
> >> requestURI:
> >> /drools-guvnor/org.drools.guvnor.Guvnor/package/defaultPackage/LATEST
> >> test:
> >> /drools-guvnor/org.drools.guvnor.Guvnor/package/defaultPackage/LATEST
> >> //org.drools.guvnor.server.files.PackageDeploymentServlet.doGet -
> >> End
> >> FileManagerUtils.loadBinaryPackage() ... //
> >> org.drools.guvnor.server.files.FileManagerUtils.loadBinaryPackage -
> >> Begin
> >> FileManagerUtils.loadBinaryPackage item = class
> >> org.drools.repository.AssetItem:Content of rule item named 'testRF':
> >> Content: <?xml version="1.0" encoding="UTF-8"?>
> >> <process xmlns="http://drools.org/drools-5.0/process"
> >> xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
> >> xs:schemaLocation="http://drools.org/drools-5.0/process
> >> drools-processes-5.0.xsd"
> >> type="RuleFlow" name="ProjectApprovalProcess"
> >> id="ProjectApprovalProcess" package-name="defaultPackage" >
> >>
> >> <header>
> >> <variables>
> >> <variable name="project" >
> >> <type
> >> name="org.drools.process.core.datatype.impl.type.ObjectDataType"
> >> className="com.yesVin.workflow.project.Project" />
> >> </variable>
> >> <variable name="status" >
> >> <type
> >> name="org.drools.process.core.datatype.impl.type.StringDataType" />
> >> </variable>
> >> </variables>
> >> </header>
> >>
> >> <nodes>
> >> <start id="1" name="Start" x="15" y="11" width="80" height="40"
> >> />
> >> <end id="2" name="End" x="206" y="442" width="80" height="40" />
> >> <humanTask id="3" name="Review Project" x="126" y="12"
> >> width="80"
> >> height="40" >
> >> ..
> >> ...
> >> .....
> >> ......
> >> //org.drools.guvnor.server.files.FileManagerUtils.loadBinaryPackage
> >> -
> >> End
> >> Package.readExternal isDroolsStream = true //
> >> org.drools.rule.Package.readExternal - Begin
> >> Package.readExternal pkg = null
> >> dialectRuntimeRegistry =
> >> org.drools.rule.DialectRuntimeRegistry at 198046
> >> name = defaultPackage
> >> imports =
> >> {defaultPackage.*=org.drools.rule.ImportDeclaration at d75e0360}
> >> staticImports = []
> >> functions = {}
> >> factTemplates = {}
> >> ruleFlows = {}
> >> globals = {}
> >> valid = true
> >> rules = {}
> >> classFieldAccessorStore =
> >> org.drools.base.ClassFieldAccessorStore at 34b350
> >> //org.drools.rule.Package.readExternal - End
> >> --
> >> View this message in context:
> >>
> >
> http://www.nabble.com/Cannot-view-Process-Definitions-in-gwt-console-tp25056005p25056005.html
> >> Sent from the drools - user mailing list archive at Nabble.com.
> >>
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users at lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >
> >
> >
> >
> > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Cannot-view-Process-Definitions-in-gwt-console-tp25056005p25152800.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 26 Aug 2009 16:31:04 -0500
> From: James Owen <jco2009 at att.net>
> Subject: Re: [rules-users] Using KnowledgeAgent with Stateful session
> To: Rules Users List <rules-users at lists.jboss.org>
> Message-ID: <7DCB55B5-8A89-481A-BCDC-77E4A2C5F0B6 at att.net>
> Content-Type: text/plain; charset="us-ascii"
>
> Greetings:
>
> Nobody seems to be replying and I'm not really "qualified" to reply
> but I might be able to point you in the right direction. Long, long
> ago in a land far, far away we did a really cool project using
> Intelligent Agents and employed most of the technology from FIPA, The
> Foundation for Intelligent Physical Agents; see http://www.fipa.org/
> for more information.
>
> SDG
> James Owen
> Founder October Rules Fest
> Senior Consultant / Architect KBSC
> http://www.kbsc.com
> http://www.OctoberRulesFest.org
> Twitter: OctRulesFest
> Blogs:
> http://JavaRules.blogspot.com [Rulebased Systems Blog]
> http://ORF2009.blogspot.com [October Rules Fest Blog]
> http://exscg.blogspot.com/ [Expert Systems Consulting Group Blog]
>
> "If I have seen a little further it is by standing on the shoulders of
> giants."
> Sir Isaac Newton in a letter to Robert Hooke, 5 Feb 1676
>
> Come to October Rules Fest and stand on the shoulders of the Giants of
> the industry; if only for a week.
>
>
>
> On Aug 26, 2009, at 11:34 AM, nestabur wrote:
>
> >
> >
> > Does anyone tried to use the knowledgeAgent with statefulSessions?
> >
> > I've tried to configure my rule engine obtaining unexpected behaviour.
> >
> > I configure my statefulSession as follows:
> >
> > wm = (ReteooStatefulSession) ((KnowledgeBaseImpl) kagent
> >
> .getKnowledgeBase()).ruleBase.newStatefulSession(
> > (SessionConfiguration) sessionConf, env);
> > ksession = new StatefulKnowledgeSessionImpl(wm,
> > kagent.getKnowledgeBase());
> >
> > And after updating the KnowledgeBase in the agent I update my
> > ksession:
> >
> > wm.setRuleBase((InternalRuleBase) ((KnowledgeBaseImpl) kagent
> >
> .getKnowledgeBase()).ruleBase);
> > ksession = new StatefulKnowledgeSessionImpl(wm,
> > kagent.getKnowledgeBase());
> >
> > Without using entry-points this approach works as expected, but
> > using them
> > it fails after the first update throwing the error:
> >
> > Exception while processing message: java.lang.NullPointerException
> > java.lang.NullPointerException
> > at
> > org
> > .drools
> > .reteoo
> > .ReteooFactHandleFactory.newFactHandle(ReteooFactHandleFactory.java:
> > 54)
> > at
> > org
> > .drools
> > .common
> > .AbstractFactHandleFactory
> > .newFactHandle(AbstractFactHandleFactory.java:79)
> > at
> > org
> > .drools
> > .common
> > .AbstractFactHandleFactory
> > .newFactHandle(AbstractFactHandleFactory.java:66)
> > at
> org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:109)
> > at
> org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:80)
> > at
> org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:28)
> >
> > Browsing the drools core code I found the line that was throwing the
> > exception and tried to get the same result by implementing:
> >
> > if (!((InternalRuleBase) ((KnowledgeBaseImpl)
> > ksession.getKnowledgeBase()).ruleBase)
> > .getTypeDeclaration(fact.getClass()) ==
> null)
> > log.info (((InternalRuleBase) ((KnowledgeBaseImpl)
> > ksession.getKnowledgeBase()).ruleBase)
> >
> > .getTypeDeclaration
> > (fact.getClass()).getTimestampExtractor().toString());
> >
> > after updating my ksession. The result was the same, again the same
> > exception thrown but my logger wrote:
> > 18:01:50,232 INFO [ClassFieldExtractor class=MyPackage.MyFact
> > field=myTimestampField]
> >
> > So I dont know why the core is throwing that exception, is that
> > implementation correct?, any ideas?
> >
> >
> > Thanks,
> >
> > Nestor
> >
> > --
> > View this message in context:
> http://www.nabble.com/Using-KnowledgeAgent-with-Stateful-session-tp25151447p25151447.html
> > Sent from the drools - user mailing list archive at Nabble.com.
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
>
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