Globals cannot to be used - directly or indirectly - as objects that should trigger the firing of rules. It is only insert, modify or update, and retract that cause (re-)evaluation of LHS conditions. -W On 31 October 2011 15:05, elsdestickere <elsdestickere(a)yahoo.com&gt; wrote: > Hi, > > I read docs about global and Hibernate to access your DB from the rules. > I tried something simular for in memory DAO's. > But some rules fire ("WM" in RHS) as the DAO has 3 items, but others > ("dao" > in LHS) don't, how is that possible? > > global RepositoryFactory repFact; > rule "dao" > when > k : Customer( ) from repFact.getCustomerRepository().findAll(); > then > System.out.println( "Drools "+drools.getRule().getName()+": " > +k.getName()); > end > rule "WM" > when > k : Customer( ) ; > then > System.out.println( "Drools "+drools.getRule().getName()+": " > +k.getName()+" + size: > "+repFact.getCustomerRepository().findAll().size()); > end > ... > RepositoryFactory repFact = Registry.getRepositoryFactory(); > ksession.setGlobal("repFact", repFact); > ... > CustomerRepository customerRepo = Registry.getRepositoryFactory() > .getCustomerRepository(); > customerRepo.add(tom); > customerRepo.add(elise); > customerRepo.add(bert); > ksession.insert(bert); > ksession.fireAllRules(); > > ... > Output: > Drools WM: Bert + size: 3 > > br, > Els > > > -- > View this message in context: > http://drools.46999.n3.nabble.com/global-as-link-to-DB-different-results-... > Sent from the Drools: User forum mailing list archive at Nabble.com. > _______________________________________________ > 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

If the "donator" isn't a fact, it's not visible to the engine. Globals are OK on the RHS and as a provider for constant (!) data used as stand-in for literals on the LHS. Other than this: beware! -W 2011/10/31 Michael Anstis <michael.anstis(a)gmail.com&gt; > I thought use of the "from" keyword allowed you to reason over facts > (potentially) not in WM. I believe the OP's example is mentioned in the > docs? > > sent on the move > > On 31 Oct 2011 15:08, "Wolfgang Laun" <wolfgang.laun(a)gmail.com&gt; wrote: > >> Globals cannot to be used - directly or indirectly - as objects that >> should trigger >> the firing of rules. It is only insert, modify or update, and retract >> that cause (re-)evaluation of LHS conditions. >> >> -W >> >> On 31 October 2011 15:05, elsdestickere <elsdestickere(a)yahoo.com&gt;wrote: >> >>> Hi, >>> >>> I read docs about global and Hibernate to access your DB from the rules. >>> I tried something simular for in memory DAO's. >>> But some rules fire ("WM" in RHS) as the DAO has 3 items, but others >>> ("dao" >>> in LHS) don't, how is that possible? >>> >>> global RepositoryFactory repFact; >>> rule "dao" >>> when >>> k : Customer( ) from repFact.getCustomerRepository().findAll(); >>> then >>> System.out.println( "Drools "+drools.getRule().getName()+": " >>> +k.getName()); >>> end >>> rule "WM" >>> when >>> k : Customer( ) ; >>> then >>> System.out.println( "Drools "+drools.getRule().getName()+": " >>> +k.getName()+" + size: >>> "+repFact.getCustomerRepository().findAll().size()); >>> end >>> ... >>> RepositoryFactory repFact = Registry.getRepositoryFactory(); >>> ksession.setGlobal("repFact", repFact); >>> ... >>> CustomerRepository customerRepo = Registry.getRepositoryFactory() >>> .getCustomerRepository(); >>> customerRepo.add(tom); >>> customerRepo.add(elise); >>> customerRepo.add(bert); >>> ksession.insert(bert); >>> ksession.fireAllRules(); >>> >>> ... >>> Output: >>> Drools WM: Bert + size: 3 >>> >>> br, >>> Els >>> >>> >>> -- >>> View this message in context: >>> http://drools.46999.n3.nabble.com/global-as-link-to-DB-different-results-... >>> Sent from the Drools: User forum mailing list archive at Nabble.com. >>> _______________________________________________ >>> 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 > 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