5:59 a.m.
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(a)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(a)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(a)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@gmail
> > .com>
To
> > Sent by: rules-users(a)lists.jboss.org
> > rules-users-bounc
cc
> > es(a)lists.jboss.or
> > g
Subject
> > [rules-users] "Exists" CE
behaviour
> >
> > 13/07/2009 14:11
> >
> >
> > Please respond to
> > Rules Users List
> > <rules-users@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(a)lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users(a)lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
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>
>
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