[Zope-DB] Per-user connections
Fri, 6 Dec 2002 23:43:11 +0100
Yves Bastide writes:
> Dieter Maurer wrote:
> > ...
> > Synchronization is also difficult with pure RAM based sessions,
> > such as ZSession.
> Can you elaborate? Problems with storing objects in the session object,
> with lifetime?
Transaction control is usually done at the connection level.
This implies that concurrent (unsynchronized) threads must not share
the same connection (as otherwise "commit/rollback" in one thread
will affect the other (unaware) thread).
When you put a connection in a session, there is no garantee
that two threads (belonging to the same session, e.g.
handling different requests from a frame based appliciation)
do not share the same connection.
Unless appropriate synchronisation is used, non-deterministic
transaction behaviour may be the consequence.