[jboss-user] [jBPM] - Re: Creating an audit trail

[Alejandro Guizar]

Alejandro Guizar [http://community.jboss.org/people/alex.guizar%40jboss.com] created the discussion

"Re: Creating an audit trail"

To view the discussion, visit: http://community.jboss.org/message/565312#565312

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> I'm trying to construct an audit mechanism for my JBPM processes.  When I first saw the event section in the user guide, I thought it would be perfect, but, after looking at the example, it seems that events are almost completely worthless.  The reason for this is that you a) have to explicitly scatter events in your processes (a real nightmare if you have a lot of them) and b) have to explicitly tell it which class is a listener.  I thought the whole point of events was that you didn't need to know what or how many listeners were listening.  You could just generate an event and every listener who had registered would know about it.  Am I missing something here?
In the  http://www.research.ibm.com/designpatterns/example.htm observer pattern, it is the event source or observable subject the one who is unaware of the observers. However, observers still have to register themselves, otherwise the source cannot possibly know about them! In this case jBPM will notify as many listeners as you want to put in place, but you still have to declare them.
> In any case, here's what I would like to do.  I would like have an audit class which is notified on every step of a process.  The audit class may choose to record these steps and some of the variables which would allow reconstruction of the "flow" of a specific execution of a process.  I welcome any ideas about how to best implement this since it doesn't seem to be provided by default.
If notified +on every step+ means each time an activity +ends+ then you can leverage  http://docs.jboss.com/jbpm/v4/userguide/html_single/#d0e4640 event propagation and, with a single event tag,  receive a notification each time an activity ends.
<process name='Insurance claim' key='ICL'>
  <on event='end'>
    <event-listener propagation='enabled' class='org.example.EventListener' />
  </on>
  <start>
    <transition to='a' />
  </start>
  <state name='a'>
    <transition to='b' />
  </state>
  <end name='b' />
</process>
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