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 <[EMAIL PROTECTED]>:
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 < [EMAIL PROTECTED]>:
>
> 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
> [email protected]
> 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
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