RE: [Springframework-developer] SWF - Creating HTTP sessions - Feedback needed

[Keith D. <ke...@in...>]

Seth,

Excellent idea.

If we extract an interface from the HttpServletExecutionManager, we get
something like:

public interface FlowExecutionStorage {
    public FlowExecution loadFrom(Event inputEvent);
    public void saveOrUpdate(FlowExecution flowExecution);
    public void remove(FlowExecution flowExecution);
}

Or something like that.  Erwin what do you think? Need to think about it
more.  I imagine here the FlowExecutionStack would have to be reconstructed
from the Event parameters, for example: http request parameters, in an http
servlet environment.  It also has to be rehydrated with services on
deserialization as well, including the FlowLocator and its
FlowExecutionListenerList.

Keith

-----Original Message-----
From: spr...@li...
[mailto:spr...@li...] On Behalf Of
Seth Ladd
Sent: Thursday, March 31, 2005 6:21 PM
To: spr...@li...
Subject: Re: [Springframework-developer] SWF - Creating HTTP sessions -
Feedback needed

On Thu, 31 Mar 2005 17:49:24 -0500, Keith Donald <ke...@in...>
wrote:
> Just thinking out loud here, but no, I don't think this would be too
> difficult to implement.  There is potentially lot to serialize out on each
> request, though, particularly if you a flow execution that has spawned
many
> nested subflows.
> 
> Methinks we could have custom tag that serializes the FlowExecutionStack
on
> each request.  This would include serializing:
> - The ID of the flow execution (randomly generated guid)
> - The stack of IDs of all spawned flows, the top being the active flow and
> the rest any suspended parent flows (if the active flow is a subflow)
> - For each flow in the stack, everything in 'flow scope'.

Keith,

Sounds like there might be two Strategies here for storing the
FlowExecutionStack: HttpSession Strategy and HttpRequest Strategy. 
The developer can then choose the strategy for their needs, as there
are good use cases for not requiring a session.

Seth


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