Thanks for that Alex.
We are having an internal discussion about this. Basically it is a
difference between leased locks and our current implementation of optimistic
locks. We are thinking about what is better for our users.
Our current locking mechanism disallows editing of a document if any other
user has a draft of that document.
Our persistence implementation creates a new draft as soon as a user begins
editing a form rather than at first draft save/autosave so we always know
when a form is being edited. Since the drafts are removed when the form is
saved this works reasonably well but of course the locks can last for as
long as a draft is kept (default 7 days in our implementation) so we also
allow a second user to ignore the lock and continue to edit and save the
form.
Once the second user has saved the form, the first user's draft becomes an
orphan and cannot be saved (we use the form version to do this, essentially
a form of optimistic locking). If the first user saves first then the second
user cannot out but that is the nature of optimistic locking.
In the failure cases the users still have access to the draft and can view
it to enable them to manually merge any changes if they want.
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Locked
