Andreas Hartmann wrote:
Hi Lenya devs,
we have a problem in the current transaction handling.
Imagine the following scenario:
- A document is in the workflow state "authoring".
- Alice invokes a usecase which alters the workflow.
- The menubar is displayed on the workflow screens.
- The usecase comprises several steps, it is committed
only after the last step.
- On the second screen, the workflow state of the document has
already been changed to "review".
- This means that the menu item "publish" can be invoked,
because the identity map is attached to the request and
accessed by all components (no isolation of the active usecase).
- Invoking the menu item results in an error because the usecase
hadn't been committed.
I see two solutions:
a) Do not allow to show the menu during usecase execution
(equivalent to a model dialog box).
b) Don't access the repository documents via sources, but directly
(a separate repository session for the active usecase).
The RepositorySource wouldn't implement ModifiableSource anymore.
maybe I misunderstand, but shouldn't the workflow be a singleton and
and displayed should the current committed stated, which means if
a usecase is in transaction (e.g. authoring --> review), then authoring
should be displayed and not review.
Makes sense?
Michi
IMO (a) is just a workaround, (b) is the way to go.
WDYT?
-- Andreas
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Michael Wechner
Wyona - Open Source Content Management - Apache Lenya
http://www.wyona.com http://lenya.apache.org
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