[Hibernate] new SPI for EJB3/Seam

[Gavin K. <gav...@jb...>]

For truly efficient clustering of extended persistence contexts in the
context of Seam or EJB3, we need a way to propagate unflushed
changesets. What we need is an SPI like this:

   Serializable changeset =3D session1.getChangeSet();

   session2.applyChangeSet(changeset);

where session2 is an empty session, or perhaps even a session with some
of the same entities as session1. The only state that needs to be sent
in the changeset is new entities, unflushed updates to entities and
deletions of entities.

Steve, WDYT?