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From Jukka Zitting <jukka.zitt...@gmail.com>
Subject Re: Propagation of Session auto refresh behaviour to e.g. UserManager
Date Tue, 06 Aug 2013 08:41:25 GMT

On Tue, Aug 6, 2013 at 11:24 AM, Michael Dürig <mduerig@apache.org> wrote:
> We might have similar issues with other entities tied to a session like
> PrincipalManager, VersionManager, ... Basically all (indirect) callers of
> SessionDelegate#getRoot() are suspect... and that's quite a list.

We sorted out a good pattern for doing stuff like this already with
the namespace registry. Basically:

a) When making transient changes or reading information that can come
from an earlier repository snapshot, use sessionDelegate.getRoot() so
that you see the exact same state as the rest of the session.

b) When persisting changes directly to the repository or reading from
the latest repository state without interference from transient
changes, use sessionDelegate.getContentSession().getLatestRoot() and
follow up with a session.refresh(true) to force the rest of the
session to keep up.

The abstract method pattern in ReadWriteNamespaceRegistry (or
something similar) can be used to avoid a direct oak-jcr /
SessionDelegate dependency.

That pattern should cover the needs of the UserManager and other
places without the need to manage the states of multiple independent
Root instances.


Jukka Zitting

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