Re: [rules-users] From v 3.0.6 to 4.0.0

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(a)gmail.com&gt;: > > 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(a)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(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users