Re: [Springframework-developer] OJB support

[<jue...@we...>]

I've just finished all remaining OJB support infrastructure features: =
PersistenceBrokerTransactionManager can expose JDBC transactions now, =
there's a PersistenceBrokerDaoSupport class, and there's a =
LocalDataSourceConnectionFactory helper that allows to use a =
Spring-managed DataSource bean as OJB connection factory.
=20
LocalDataSourceConnectionFactory works with a static field, which is =
clearly not ideal but forced by OJB's static initializer model. The OJB =
guys told me that they are gonna address this for OJB 1.1, so the =
current implementation is hopefully just an intermediate solution.
=20
Note that an "Open PersistenceBroker in View" pattern is not necessary =
with OJB: It simply fetches a new Connection for lazy loading rather =
than depending on the original PersistenceBroker still being open. I've =
not actually tested this, but it was pointed out in the TSS thread.
=20
I'll provide an OJB data access implementation for Petclinic in the =
course of this weekend, as an example for OJB PersistenceBroker =
integration. I don't assume that this is more than 4 hours of work. I'll =
also verify the lazy loading assumptions there. Furthermore, I'll =
provide a test suite for the OJB support in the course of next week.
=20
The only further JAR that we need to ship for building the OJB =
integration and running the sample should be db-ojb-1.0.0 jar (~800 KB). =
I guess that's OK for the -with-dependencies download. It is certainly =
desirable to show that we support OJB out-of-the-box just like =
Hibernate.
=20
Early feedback welcome :-)
=20
Juergen
=20

________________________________

Von: spr...@li... im Auftrag =
von j=FCrgen h=F6ller [werk3AT]
Gesendet: Fr 02.07.2004 21:02
An: spr...@li...
Betreff: [Springframework-developer] OJB support



Hi everybody,

On the occasion of the recent TSS thread on OJB 1.0 final, I've decided =
to give OJB PersistenceBroker integration a go. I've already committed =
the initial bunch a couple of hours ago, providing =
PersistenceBrokerTemplate, PersistenceBrokerTransactionManager, etc.

This initial stuff took just about 4 hours, including getting OJB to =
work with a simple example! I was pleasantly surprised by how easy OJB =
is to set up. I'm not fond really fond of its static initializer model, =
but it does work and is simple enough to get going.

I'm currently working on support for exposing the JDBC Connection in =
PersistenceBrokerTransactionManager and other refinements. I plan to add =
a Petclinic data access version for OJB this weekend: As far as I can =
judge at this point of time, this should be simple enough to do.

One of the distinct characteristics of OJB's PersistenceBroker is that =
it offers all of OJB's mapping and querying capabilities, but does not =
attempt to provide object-level transactions, i.e. does not do automatic =
change detection but rather rely on explicit store calls. For =
Petclinic-style web apps, this is more than enough.

The stuff in CVS does work already, so whoever's interested, feel free =
to have a look at it :-)

Juergen


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