Re: Going back in a flow

Hello,


Regarding the subject "Going back in a flow" and since it seems Shark
does not provide a mechanism to perform this "back to the past" we are
planning to develop it. We think that a workflow engine should provide
administration mechanisms to go back in case anything is wrong. We do
not think that the approach would be to put back transitions in the XPDL
for all the activities, we believe that such behaviour should be
provided by the workflow engine in order to have maximum control of the
flows.

Our proposal is as follows, and we would like to know your opinions as
Shark experts:

We will have a database support to store process_contexts and open
activities. Everytime that an activity is going to be completed we will
store the process_context and a list of all the activities open in that
moment (in fact the type of activity, since the activity instance id
would be lost). In this way we have "checkpoints" of different moments
of a process instance. The administrator then can choose one moment to
go back and our mechanism would:

-Abort all current open activities
-Restore the process_context
-Open again all the activities of the stored list that were open at the
moment of the checkpoint

This is our first idea, what do you think about it? Do you think is
there any other way?

Thank you very much.


Kind regards.

David

El lun, 29-08-2005 a las 14:25 -0400, Ben Anderson escribió:

> David,
> afaik there is no capability to do this in shark.  The solution to
> your problem would be to define an or split after activity B, which
> either goes back to activity A, or on to activity C.
> hth,
> Ben
> 
> On 8/25/05, David Simón <[email protected]> wrote:
> >  Hello,
> >  
> >  Another question in Shark 1.0 context. Is there any way to go back in a
> > flow to restablish the flow context in a time in the past (I mean,
> > activities open, values of variables in the context, assignments)? It is a
> > typical administration task that we need to provide but I would like to know
> > if there is any easy way through Shark API to do this. I have seen that
> > Shark has tables containing the history of the flow
> > (OLDEVENTAUDITDATA,STATEEVENTAUDIT and so on) so I guess it
> > is prepared to go back but I do not know how.
> >  
> >  Thank you.
> >  
> >  Best regards,
> >  
> >  David. 
> > 
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