[jboss-jira] [JBoss JIRA] (JBRULES-3144) undo-then: when rule becomes no longer true execute a callback

undo-then: when rule becomes no longer true execute a callback -------------------------------------------------------------- Key: JBRULES-3144 URL: https://issues.jboss.org/browse/JBRULES-3144 Project: Drools Issue Type: Feature Request Security Level: Public(Everyone can see) Components: drools-core (expert) Reporter: Geoffrey De Smet Assignee: Mark Proctor Priority: Critical Here's what I'd like to be able to do: {code} rule "serviceConflict" when $leftProcessAssignment : MrProcessAssignment($service : service, $machine : machine, $leftId : id) $rightProcessAssignment : MrProcessAssignment(service == $service, machine == $machine, id > $leftId) then scoreCalculator.addToHardScore(1); // No insertLogical or accumulate of those ConstraintOccurence's needed undo-then scoreCalculator.substractFromHardScore(1); end {code} And here's a more complex example where the weight isn't a static "1": {code} rule "serviceLocationSpread" when $service : MrService($locationSpread : locationSpread) $spreadCount : Number(intValue < $locationSpread) from accumulate( $location : MrLocation() and exists MrProcessAssignment(service == $service, location == $location), count($location) ) then scoreCalculator.addToHardScore($locationSpread - $spreadCount.intValue()); undo-then scoreCalculator.substractFromHardScore($locationSpread - $spreadCount.intValue()); // $spreadCount should still be the same as it used to be end {code}