On 31/07/2013, jking527467 <jason.k...@openroadsconsulting.com> wrote: > All, > > I'm new to Drools and I'm faced with what seems to be a pretty trivial task > that's taken a lot longer than expected. > > I'm working mainly with distances and am looking for an plain English > response to this trivial problem.
Plain English? Here is it in DRL: rule "not active thing" when Range( $near: near, $far: far ) $a: Actor() $t: Thing( ! active ) then end rule "activate near range" extends "not active thing" when eval( isInRange( $a, $t, $near ) ) then modify( $t ){ setActive( true ) } end rule "activate far range" extends "not active thing" when not ( $n: Thing( isInRange( $a, $n, $near ) ) ) eval( isInRange( $a, $t, $far ) ) then modify( $t ){ setActive( true ) } end > > Here's the problem: > > - Activate all things within x miles. > - If nothing is within x miles, activate all things within y miles. > > It seems pretty straight forward but here's my dilemma. If I execute on y > miles first, everything within x miles will also be activated. I need to > ensure the things between x and y miles aren't activated if anything is > within x miles of a certain fact. Don't think in terms of "executing first" and (needlessly) exercising control.# As you can see from the rules, simply transform your spec into LHS patterns. Both clauses have their one-to-one correspondence in the second and third rule, respectively, while the first one simply addresses the "player" facts. -W > > Does this make any sense to anyone? I'm have a hard time grasping the > proper approach and have looked into activation groups, etc. but haven't > had > any luck. > > Any help is GREATLY appreciated!!! > > Thanks in advance! > Jason > > > > -- > View this message in context: > http://drools.46999.n3.nabble.com/Controlling-Rule-Execution-tp4025231.html > Sent from the Drools: User forum mailing list archive at Nabble.com. > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users