[Yanel-dev] Atomic operations in Yarep

[Balz Schreier]

Hi,

do you agree that there is a potential of data inconsistency when modifying
a Yarep Group from within your application?

Scenario:
- The application itself can add and remove groups to a certain user,
depending on what that user is doing in your application.
- At the same time, a Yanel Administrator modifies memberships via the out
of the box Group Mgmt page via toolbar.

Now, the application can remove a membership like this:

                   group.removeMember(user); // this also removes the group
entry in the user XML and the user object gets saved!

                group.save();

As you can see, there is no possibility that these two steps are done in 1
step (in Java terms: synchronized).
It also does not help if you write a Facade which does these two steps in a
synchronized way because those modifications from the yanel admin page are
still bypassing that facade.

So my suggestion would be to extend Yarep by introducing this mechanism
built-in, so that there is no way that files can get corrupt.

If you agree, we should work once on a patch for Yarep where such operations
are handled atomic.
Cheers
Balz
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