[rules-users] From v 3.0.6 to 4.0.0

[Chris Woodrow]

Edson,

Thanks for your help. I also thought about the constraint inside the rule,
but I wanted the rule files to be the same.

Anyway thanks for your help, with #1, it works properly now.

Chris

2007/5/15, Edson Tirelli <tirelli at post.com>:
>
>
>    Chris
>
>    Version 3.0.x prevents by default a single fact from matching multiple
> patterns. For a couple of reasons we had to change the default in 4.0 to
> allow a single fact to match multiple patterns. If you don't want this to
> happen, you can use one of the following approaches:
>
> * Change the behavior for the whole rulebase. You can do that by either
> setting a system property ("drools.removeIdentities=true") or creating a
> RuleBaseConfiguration instance:
>
> RuleBaseConfiguration conf = new RuleBaseConfiguration();
> conf.setRemoveIdentities( true );
> RuleBase rulebase = new ReteooRuleBase( conf );
>
> * Alternativelly, you can manually add a constraint to avoid the behavior
> for specific rules, using the "this" keyword.
>
> rule "TwoCheeses"
>     when
>         $cheese1 : Cheese();
>         $cheese2 : Cheese( this != $cheese1 );
>     then
>         System.out.println($cheese1);
>         System.out.println($cheese2);
>         System.out.println ("TwoCheeses");
> end
>
>
>     We will add such information to the documentation, but the above shall
> give you the idea.
>
>     Hope it helps,
>       Edson
>
> 2007/5/15, Chris Woodrow < woodrow.chris at gmail.com>:
> >
> > Hi everyone,
> > I am new to this mailing list, I've had a quick look at archives and
> > didn't find anything ont this subject but sorry if this has allready been
> > underlined.
> >
> > Here is my problem, while I was doing some test on v3.0.6, 4.0.0 came
> > out, so I started to migrate on the new version. Then I found out an
> > unexpecteed behavior on the 4.0.0.
> >
> > I have been compiling both with Java 5 and running whith Java 1.5.0_11.
> > And I used versions with dependencies on both tests.
> >
> > I have made an exemple for you to make it as clear as possible, here is
> > the rule :
> >
> >
> > ---------------------------------------------------------------------------------------
> > package rules
> >
> > rule "TwoCheeses"
> >     when
> >         $cheese1 : Cheese();
> >         $cheese2 : Cheese();
> >     then
> >         System.out.println($cheese1);
> >         System.out.println($cheese2);
> >         System.out.println("TwoCheeses");
> > end
> >
> > ---------------------------------------------------------------------------------------
> >
> > When I run it on V3.0.6, with this code :
> >
> > ---------------------------------------------------------------------------------------
> >
> > package rules;
> >
> > import java.io.InputStreamReader;
> >
> > import org.drools.RuleBase;
> > import org.drools.RuleBaseFactory;
> > import org.drools.WorkingMemory;
> > import org.drools.compiler.PackageBuilder;
> >
> > public class Cheese {
> >     public static void main(String[] args) throws Exception{
> >         PackageBuilder builder = new PackageBuilder();
> >         builder.addPackageFromDrl(new InputStreamReader(
> > Cheese.class.getResourceAsStream ("rule.drl")));
> >
> >         RuleBase ruleBase = RuleBaseFactory.newRuleBase();
> >
> >         ruleBase.addPackage(builder.getPackage());
> >
> >         WorkingMemory workingMemory = ruleBase.newWorkingMemory ();
> >
> >         Cheese cheese = new Cheese();
> >
> >         workingMemory.assertObject(cheese);
> >
> >         workingMemory.fireAllRules();
> >     }
> > }
> > ---------------------------------------------------------------------------------------
> >
> >
> > The rule doesn't fire, which is normal AMHA since only one Cheese object
> > is asserted to the WM
> >
> > When I run it on V4.0.0, whith this code :
> > ---------------------------------------------------------------------------------------
> >
> > package rules;
> >
> > import java.io.InputStreamReader;
> >
> > import org.drools.RuleBase;
> > import org.drools.RuleBaseFactory;
> > import org.drools.StatefulSession;
> > import org.drools.compiler.PackageBuilder;
> >
> > public class Cheese {
> >     public static void main(String[] args) throws Exception{
> >         PackageBuilder builder = new PackageBuilder();
> >         builder.addPackageFromDrl(new InputStreamReader(
> > Cheese.class.getResourceAsStream ("rule.drl")));
> >
> >         RuleBase ruleBase = RuleBaseFactory.newRuleBase();
> >
> >         ruleBase.addPackage(builder.getPackage());
> >
> >         StatefulSession statefulSession = ruleBase.newStatefulSession();
> >
> >
> >         Cheese cheese = new Cheese();
> >
> >         statefulSession.assertObject(cheese);
> >
> >         statefulSession.fireAllRules();
> >     }
> > }
> > ---------------------------------------------------------------------------------------
> >
> > Now the rule fires and $cheese1 $cheese2 have the same reference.
> >
> > I have been searching in all docs, this modification of behavior doesn't
> > seem to be expected, has anyone noticed this?
> >
> > Thanks for your help.
> >
> > Chris
> >
> >
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
>
>
> --
>   Edson Tirelli
>   Software Engineer - JBoss Rules Core Developer
>   Office: +55 11 3529-6000
>   Mobile: +55 11 9287-5646
>   JBoss, a division of Red Hat @ www.jboss.com
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>


-- 
woodrow.chris at gmail.com est ma nouvelle adresse e-mail.
chris.woodrow at free.fr va disparaître, pensez à faire le changement.
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