Re: [rules-users] How to execute a rule only when a fact is retracted

Yet another option to experiment with: use a listener to feed back trigger facts in the WM ksession.addEventListener( new WorkingMemoryEventListener() { public void objectInserted(ObjectInsertedEvent event) {} public void objectUpdated(ObjectUpdatedEvent event) {} public void objectRetracted(ObjectRetractedEvent event) { if( ... ) { ... ksession.insert() ... } } }); Actually, "closure callbacks" have already been discussed and will probably be provided soon Davide -- View this message in context: http://drools.46999.n3.nabble.com/How-to-execute-a-rule-only-when-a-fact-... Sent from the Drools: User forum mailing list archive at Nabble.com.