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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