[Zope-CMF] Zope 3 events from workflow

[Jens Vagelpohl]

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> Am I right in thinking that DCWorkflow does not send any Zope 3  
> events? I'm not terribly familiar with that code, but some grepping  
> suggests so.
>
> Do you agree this would be useful? (I've got a pretty strong need  
> for it  for Plone 3, i.e. CMF 2.1 - I'm sure we can work around it  
> in Plone, but I'd rather do it properly)

It is definitely useful in the general migration towards more event- 
based processing.


> I'm not quite sure where the best place to execute the event is.  
> One option may be DCWorkflow/DCWorkflow.py, in notifyBefore() and  
> notifySuccess(). Here, though, I get a bit confused about how to  
> construct the wf_name and state_before/state_after parameters. I  
> guess they're not always needed, but they seem like they'd be  
> useful to most event handlers.

Eyeballing the code seems to suggest  
DCWorkflowDefinition._executeTransition as the place where both the  
old state and the new state are known.

If events are used I'm not sure what the notify*-Methods would be  
used for anymore.

jens



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