RE: [Springframework-developer] Web Flow progress

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

Dave,

 

Good point about the flow execution manager - it should be configurable,
really, with a default as is. I fixed this.

 

I also improved the ActionExecutionException - adding in the
ActionState.NamedAction contextual information.

 

Keith

 

  _____  

From: spr...@li...
[mailto:spr...@li...] On Behalf Of
David Hewitt
Sent: Wednesday, March 23, 2005 4:30 AM
To: spr...@li...
Subject: RE: [Springframework-developer] Web Flow progress

 

I have a couple of comments about Webflow based on my usage in a current
application.

 

Firstly, FlowController is responsible for creating its own
HttpFlowExecutionManager - I guess I don't understand why this isn't a
dependency that's injected in the traditional way. I had to subclass the
existing flow execution manager to get some behaviour I desired (storing
flow executions in the servlet context, rather than the session), and the
current structure meant I also had to subclass FlowController. 

 

Secondly, it would be nice if the exceptions thrown to indicate missing
state or actions actually provided accessors to expose which state/action
was missing. Currently I have immplemented fallback logic such that if an
action is not found in the current flow, I can check in the parent flow(s)
and handle back button issues with subflows quite elegantly. My logic would
have been simpler if the caught exception indicated the state/action that
was the problem.

 

Thanks,

-Dave 

 

  _____  

From: spr...@li... on behalf of
Erwin Vervaet
Sent: Tue 22/03/2005 20:22
To: spr...@li...
Subject: [Springframework-developer] Web Flow progress

All,

We've been making very good progress on the web flow system the last few
days. Things are shaping up for a preview release that might come as soon as
next weekend!

The code is in good shape again and all JavaDoc is up-to-date. All samples
are also working again.
For those with an interest in web flows, I fully recommend that you take a
look at the code that is in CVS right now
(http://cvs.sourceforge.net/viewcvs.py/springframework/spring/sandbox/src/or
g/springframework/web/flow/)
and let us know what you think! Any input would be appreciated!

Issues left to work out (not necessarily for the preview release :):

* Conditional transitions: basic support is there (via TransitionCriteria
interface and a simple OgnlTransitionCriteria implementation), but details
have to be worked out:
    - how to integrate this into XML flow definitions?
    - scope precedence? or should all scopes be merged before being
evaluated by the expression?

* Token based transitions (e.g. <transition on="countrySelected"
to="register.${request.country}"/>): do we need this? There is no support
for this at the moment.

* Does the RequestContext need to keep track of a history of events signaled
during its lifecycle? It's not the case for the moment but would be simple
to implement. Also, do we need a query interface to find an event parameter
across all signaled events for a particular request? Are there any good
use-cases for this?

* Do we need some convenience accessor on the RequestContext to find
attributes in any scope: try request scope first, then fall back on flow
scope? This would be simple to add.

Erwin Vervaet
erw...@er...



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