[Springframework-developer] Fwd: Cayenne with Spring (preview)

[Peng W. <wp...@gm...>]

---------- Forwarded message ----------
From: Andrus Adamchik <an...@ob...>
Date: Thu, 23 Dec 2004 18:53:28 -0500
Subject: Re: Configuring Cayenne with Spring (preview)
To: cay...@ob...


One last thing before I leave...

http://objectstyle.org/downloads/cayenne/demos/cayenne-spring.tar.gz

This is a first cut of Cayenne/Spring integration package. This
download contains classes from "org.springframework.orm.cayenne"
package, a few unit tests and a complete Spring PetClinic web
application done in Cayenne. It is in a good enough shape, so when I
get back from vacation I am planning to submit it to Spring project
(don't know what is their current policy on accepting third-party
integration packages; if they don't take them anymore, we'll release it
in Cayenne).

Supported features:

* Recasting Cayenne exceptions to Spring DAO exceptions. Some of it is
a bit artificial, as we don't have deep inheritance hierarchy of
exceptions. Still it has its value, e.g. SQL exceptions are unwrapped
and passed to Spring for further analysis.

* CayenneTemplate - a Spring facade to DataContext that does
DataContext "injection", exception handling, etc. Actually it is a
pretty nice thing in itself... Template is stateless (relying on thread
DataContext) and can be subclassed and customized to intercept various
DataContext operations.

* Automatic DataContext rollback on failures. There was a question
about it on cayenne-user recently
(http://objectstyle.org/cayenne/lists/cayenne-user/2004/12/0087.html).
With CayenneTemplate this can be implemented as a policy (see
"autoRollback" property).

* WebInterceptor - a way to bind HttpSession DataContext to the request
thread from Spring configuration.

* ConfigurationFactory - a factory to load Cayenne project in Spring
without relying on static Configuration (something that Cayenne does
right now by default). ConfigurationFactory also supports overriding
DataSource for all project DataNodes, so you can configure DataSource
in Spring if you want to.

Please let me know if anyone has any feedback.

Andrus