Re: [rules-users] Cutom Attributes in Drools

You can add any metadata using the format @name( "value" ) or @name( key=value ). You can then look them up using rule.getMetaData(). Please notice that there's a bug (solved by an open pull request) that does not let you write just @name. In order to use those attributes to control whether a rule fires or not, you can use the "declarative agenda", i.e. add meta-rules to your knowledge base such as: rule "Meta" @activationListener('direct') when // assuming the attribute is @region( [value] ) $a : Activation( rule.metaData[ "name" ] != "MyDesiredRegion", $objs : objects ) // any condition on the tuple here, if needed then drools.cancelActivation( $a ); end notice that you'll have to enable the corresponding option first: KnowledgeBaseConfiguration kconf = KnowledgeBaseFactory.newKnowledgeBaseConfiguration(); kconf.setOption( DeclarativeAgendaOption.ENABLED ); KnowledgeBase kb = KnowledgeBaseFactory.newKnowledgeBase( kconf ); If you want to have rules override each other, watch out for an upcoming feature, "Defeasible logic". I would not store the result of the (missed) activation of a rule in a rule attribute, anyway. Can't you just use a dedicated fact(s) for that? Best Davide -- View this message in context: http://drools.46999.n3.nabble.com/Cutom-Attributes-in-Drools-tp4019692p40... Sent from the Drools: User forum mailing list archive at Nabble.com.