[rules-users] "Exists" CE behaviour
Chivotario Martin
chivotario at gmail.com
Mon Jul 13 08:35:06 EDT 2009
Hi Wolfgang,
Just seen the JIRA Issue it seems test1.drl got some copy-paste problems ,
because both rules are present :D.
However, thanks for creating the issue !
Regards,
Manuel.
2009/7/13 Wolfgang Laun <wolfgang.laun at gmail.com>
> https://jira.jboss.org/jira/browse/JBRULES-2206 created.
>
> Thanks for the code!
> -W
>
> On 7/13/09, Chivotario Martin <chivotario at gmail.com> wrote:
> > Hi Wolfgang,
> >
> > I do not know if i can use the issue tracker to post this as an issue, as
> i
> > don't know if i'm allowed to do so, and also if this is officially,
> really a
> > bug or the expected behaviour :) .
> >
> > However i left a complete piece of code showing the behaviour i'm getting
> :
> >
> > RuleTester.java
> >
> > package org.drools.test;
> >
> > import org.drools.KnowledgeBase;
> > import org.drools.KnowledgeBaseConfiguration;
> > import org.drools.KnowledgeBaseFactory;
> > import org.drools.RuleBaseConfiguration;
> > import org.drools.builder.KnowledgeBuilder;
> > import org.drools.builder.KnowledgeBuilderFactory;
> > import org.drools.builder.ResourceType;
> > import org.drools.io.ResourceFactory;
> > import org.drools.runtime.StatefulKnowledgeSession;
> >
> > public class RuleTester {
> >
> > private static final int MAX_EVENTS = 5;
> >
> > public class Foo { }
> >
> > public void test() {
> >
> > KnowledgeBaseConfiguration config =
> > KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
> >
> > ((RuleBaseConfiguration)config).setRuleBaseUpdateHandler(
> > null );
> > KnowledgeBase kbase =
> > KnowledgeBaseFactory.newKnowledgeBase(config);
> >
> > StatefulKnowledgeSession session =
> > kbase.newStatefulKnowledgeSession();
> >
> > for (int i=0; i<MAX_EVENTS; i++) {
> > session.insert(new Foo());
> > }
> >
> > for (int i=1; i<3; i++) {
> > KnowledgeBuilder kbuilder =
> > KnowledgeBuilderFactory.newKnowledgeBuilder();
> > kbuilder.add(
> > ResourceFactory.newClassPathResource( "test"+i+".drl" ),
> > ResourceType.DRL);
> >
> > if( kbuilder.hasErrors() ) {
> > System.out.println( kbuilder.getErrors() );
> > return;
> > }
> >
> > kbase.addKnowledgePackages(
> > kbuilder.getKnowledgePackages() );
> >
> > int fireCount = session.fireAllRules();
> >
> > System.out.println("Test"+i+".drl , number of
> > rules fired = "+fireCount);
> >
> > }
> >
> > session.dispose();
> >
> > }
> >
> > public static void main(String[] args) {
> > RuleTester tester = new RuleTester();
> > tester.test();
> > }
> >
> > }
> >
> >
> > test1.drl
> >
> > import org.drools.test.RuleTester.Foo;
> >
> > rule "notNotRule"
> > when
> > exists ( Foo() );
> > then
> > System.out.println("Rule fired...");
> > end
> >
> > test2.drl
> >
> > import org.drools.test.RuleTester.Foo;
> >
> > rule "notNotRule"
> > when
> > not ( not ( Foo() ) );
> > then
> > System.out.println("Rule fired...");
> > end
> >
> >
> > Using Drools 5.0.1-Final , the expected output would be :
> >
> > > Test1.drl , number of rules fired = 0
> > > Rule fired...
> > > Test2.drl , number of rules fired = 1
> >
> > If someone allows me to open this a a JIRA i would try to understand how
> to
> > use it :D and would do so.
> >
> > Regards,
> > Manuel.
> >
> >
> > 2009/7/13 Wolfgang Laun <wolfgang.laun at gmail.com>
> >
> > > Quite right, since not(not(Foo())) is equivalent to exists(Foo()).
> > >
> > > Martin, would you please submit a JIRA?
> > >
> > > -W
> > >
> > >
> > >
> > >
> > >
> > > On 7/13/09, Chivotario Martin <chivotario at gmail.com> wrote:
> > > > Hi Visu,
> > > >
> > > > My understanding (also tested) is that activations are created no
> matter
> > the
> > > > knowledge base has the rule packages loaded
> > > > before or after the working memory is filled with facts, but the
> > execution
> > > > of the rules happens automatically if the working memory is filled in
> > > > advance.Setting the RuleBaseUpdateHandler to null, prevents the
> > execution of
> > > > the rules but keeps activations to be created when adding a rule to
> the
> > > > kbase.
> > > > In this case, it seems the exists CE only creates activations if the
> > rules
> > > > are loaded before the working memory is populated.
> > > > But this doesn't happen if i change the statement :
> > > >
> > > > exists ( Foo() ) --> not ( not ( Foo() ) )
> > > >
> > > > In this case, activations are created no matter whether the kbase is
> > empty
> > > > or not before populating the WM.
> > > >
> > > >
> > > >
> > > >
> > > > 2009/7/13 Viswanathan Nageswaran <visu.nageswaran at in.ibm.com>
> > > >
> > > > > Chivotario,
> > > > >
> > > > > >From what I understand, the activation of rules happen as facts
> are
> > > > > inserted into the working memory; hence it is important for the
> > session to
> > > > > be begun against a knowledge base that has the rule packages loaded
> > before
> > > > > the facts are inserted.
> > > > >
> > > > > -Visu
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Chivotario Martin
> > > > > <chivotario at gmail
> > > > > .com>
> > To
> > > > > Sent by: rules-users at lists.jboss.org
> > > > > rules-users-bounc
> > cc
> > > > > es at lists.jboss.or
> > > > > g
> > Subject
> > > > > [rules-users] "Exists" CE
> > behaviour
> > > > >
> > > > > 13/07/2009 14:11
> > > > >
> > > > >
> > > > > Please respond to
> > > > > Rules Users List
> > > > > <rules-users at list
> > > > > s.jboss.org>
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Hi ,
> > > > >
> > > > > I'm trying to use the Exists keyword within my rules with the
> > following
> > > > > snippet :
> > > > >
> > > > > // Create a session
> > > > > KnowledgeBaseConfiguration config =
> > > > >
> > > >
> > KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
> > > > >
> > > >
> > ((RuleBaseConfiguration)config).setRuleBaseUpdateHandler(
> > > > null ); *
> > > > > KnowledgeBase kbase =
> > > > KnowledgeBaseFactory.newKnowledgeBase(config);
> > > > > StatefulKnowledgeSession session =
> > > > kbase.newStatefulKnowledgeSession();
> > > > >
> > > > > // Add some objects
> > > > > for (int i=0; i<5; i++) {
> > > > > }
> > > > >
> > > > >
> > > > > // Add a DRL to the kbase
> > > > > KnowledgeBuilder kbuilder =
> > > > KnowledgeBuilderFactory.newKnowledgeBuilder();
> > > > > kbuilder.add( ResourceFactory.newClassPathResource(
> > > > "test/existsTest.drl"
> > > > > ), ResourceType.DRL);
> > > > > kbase.addKnowledgePackages(
> > > > kbuilder.getKnowledgePackages() );
> > > > >
> > > > > // Fire rules
> > > > > int fireCount = session.fireAllRules();
> > > > >
> > > > >
> > > > > existsTest.drl :
> > > > >
> > > > > rule "existsTest"
> > > > > ( Foo() ) ); (2)
> > > > >
> > > > > end
> > > > >
> > > > > When launched , the rule is not fired (no messages , fireCount 0),
> but
> > it
> > > > > is when changing
> > > > > exists with a double not condition (2).
> > > > > If the working memory is populated after adding the rules file, the
> > exists
> > > > > CE works as expected.
> > > > > * I've used no RuleBaseUpdateHandler preventing automatic
> activations
> > to
> > > > be
> > > > > executed so fireAllRules can be used to get the fireCount, but
> > commenting
> > > > > this line out doesn't change the results.
> > > > >
> > > > > Probably i'm doing something wrong so a little help would be very
> > > > > appreciated.
> > > > >
> > > > > Regards,
> > > > > Manuel.
> > > > > _______________________________________________
> > > > > rules-users mailing list
> > > > > rules-users at lists.jboss.org
> > > > > https://lists.jboss.org/mailman/listinfo/rules-users
> > > > >
> > > > >
> > > > >
> > > > > _______________________________________________
> > > > > rules-users mailing list
> > > > > rules-users at lists.jboss.org
> > > > > https://lists.jboss.org/mailman/listinfo/rules-users
> > > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > rules-users mailing list
> > > > rules-users at lists.jboss.org
> > > > https://lists.jboss.org/mailman/listinfo/rules-users
> > > >
> > > >
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> > > https://lists.jboss.org/mailman/listinfo/rules-users
> > >
> >
> >
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> >
> >
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