[jboss-jira] [JBoss JIRA] Commented: (JBPM-810) Actions that validate transitions

Actions that validate transitions --------------------------------- Key: JBPM-810 URL: http://jira.jboss.com/jira/browse/JBPM-810 Project: JBoss jBPM Issue Type: Feature Request Components: Core Engine Reporter: Gavin King Assigned To: Tom Baeyens It is useful to be able to have an action in the stack of actions for a transition "cancel" the transition: <transition name="delete"> <action expression="#{user.checkDeletePermission}"/> <action expression="#{document.delete}"/> </transition> The first action can cancel execution of the transition (and shortcircuit the rest of the action stack) by something like: * returning false? * throwing a predefined exception class CancelTransitionException? Or perhaps we could have a specific concept of a Validator: <transition name="delete"> <validator expression="#{user.admin}"/> <action expression="#{document.delete}"/> </transition> jBPM could have a Validator interface, and the Seam integration would just let you use an EL, and check the boolean return value.