You may have thought of this already but it would be good to consider
how SDO might play with this JPA integration.
--
Kevin
Meeraj Kunnumpurath wrote:
Hi,
I have made a start on JPA integration. Haven't got to do much because
of the build problems. The current home is
sca/services/persistence/common.
Anyway, this is a brief highlight of my thinking ...
1. Support injection of entity manager factory and entity manager
instances using PersistenceUnit and PersistenceContext annotations on
member fields.
2. For entity manager factory instances, the unitName attribute is
introspected at the component load time and scans all the available
persistence.xml for matching unit name.
3. The JPA provider API is used for creating the entity manager factory.
4. Entity manager factory is caches somewhere (System composite)
5. This is then reused in all the components using the same persistence
unit.
Persistence context is trickier. Entity manager AFAIK are thread unsafe
and mostly bound to transactions. Hence, either we will have to proxy
this or use some sort of instance pooling and thread confinement in our
component management. I think, proxying would be simpler. I plan to get
at least the EMF side working by end of this week, if I can get the
build going.
Ta
Meeraj
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