I thought it did, but I may not have fully understood the question.
Using distributed locks would allow him to implement atomicity
(synchronization) of transactions in his application code without
modifying his data model, something like this:

    exclusiveLock.lock();
    try {
        // modify entity A
        // modify entity B
    } finally {
        exclusiveLock.unlock();
    }

Assuming that entities "A" and "B" are in different entity groups, and
therefore he can't use the built-in transaction support provided by
the datastore.

Vince

On Wed, Aug 26, 2009 at 12:44 PM, objectuser<[email protected]> wrote:
>
> Hey, Vince,
>
> That's really cool.  Does that address the need of the OP though?  I
> may just not be understanding it fully ...
>
> Thanks!
>

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