did you check here : http://drools.46999.n3.nabble.com/please-provide-a-rule-for-events-timeou... ----- Mail original ----- De: "dunnlow" <dunnlow(a)yahoo.com&gt; À: rules-users(a)lists.jboss.org Envoyé: Vendredi 10 Août 2012 16:19:33 Objet: [rules-users] Best design pattern for: Set of events with countdown timers? Hi, I am receiving events from a group of about 15 different event producers - each with different names (located in the message). I want to make sure that I get at least one event from each of those 15 producers within a pre-determined period of time; the period can be different for each producer. I am planning to use a template rule to relate producer name to time period. Then, I'll insert a "myTimoutObject" for each producer (not quite sure yet where/how I'll do that) which will count down from the provided time period and trigger an "alert" condition if they reach zero (and reset whenever a new event from that producer arrives into the ksession). Does anyone have experience with a better way to implement this count-down pattern? Thanks for any insight, -J -- View this message in context: http://drools.46999.n3.nabble.com/Best-design-pattern-for-Set-of-events-w... 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