[rules-users] Calculating minimal value for a group of facts

Hi, I need to calculate the min time for a set of "jobs" inserted in working mermory to know wich job is going to be finished first. Is there any way to obtain within a rule the current facts of some type to pass then to a function/method? somethin like this: Another idea to acomplish this? gobal MyService myservice rule "cmdCheckTime" ruleflow-group "comprobarExistencias" when Job(time = eval(myService.getMinTime( <jobs in working memory >)) then go, go, go... end Thank you