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

[Gavin King (JIRA)]

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.



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