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

[Tom Baeyens (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBPM-810?page=comments#action_12349303 ] 
            
Tom Baeyens commented on JBPM-810:
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isn't this a very clumsy way of starting to build a scripting language in jbpm ?

maybe we should revert to a real scripting language then ?


> 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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