Re: [Springframework-developer] Fwd: Cayenne + Spring?

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

Rod,
Thank you for your quick reply. Do you have any idea about the
following questions?

> > Pool is not a good idea! DataContext itself is lightweight, so creating
> > one on the fly is not a problem. Its value (in addition to storing
> > uncommitted state between requests) is that it caches only objects
> > relevant to a given user session, so there is a high probability of
> > cache reuse. A cached DataContext will simply hog extra memory and
> > won't add much value over the shared cache provided by DataDomain.
> >
> > Now how you do it in Spring, I have no idea... There gotta be an easy
> > way to access user session before you pass control to DAO. Spring
> > couldn't possibly be that popular if all it does is serving stateless
> > applications.. I just don't know what it is. Do you store any other
> > state in the session? How do you access it from controller?

Best Regards,

Peng

On Mon, 20 Dec 2004 10:39:07 +0000, Rod Johnson <ro...@in...> wrote:
> Thanks.
> 
> None of the core Spring developers is a Cayenne expert AFAIK, but we would certainly be happy to
> help the Cayenne community achieve integration.
> 
> Note that Oracle have now released a Spring/TopLink integration.
> (http://www.oracle.com/technology/products/ias/toplink/preview/spring/index.html). This will be
> supported by Oracle moving forward.
> 
> The experience of the TopLink integration is that Spring's Hibernate and JDO integrations provide an
> excellent architectural template which works well for other ORM products. Hopefully this should also
> be useful to a Cayenne implementation.
> 
> Rgds
> Rod
> 
> 
> Peng Wang wrote:
> > I saw this message on cayenne list, so I move it here, hope someone can help.
> >
> >
> > ---------- Forwarded message ----------
> > From: Andrus Adamchik <an...@ob...>
> > Date: Sat, 18 Dec 2004 13:16:31 -0500
> > Subject: Re: Cayenne + Spring?
> > To: cay...@ob...
> >
> >
> > Hi James,
> >
> >
> >>Are many people using Cayenne and Spring together?
> >
> >
> > I know that many are waiting till the "official" integration, but if
> > someone implemented their own Spring factories for Cayenne stack,
> > please send us a note with your examples. Just yesterday I started
> > doing the research of the steps needed for such integration, so I have
> > the same question as James.
> >
> >
> >
> >>Each Service can reference multiple DAOs, and each Web Controller can
> >>reference many Services.
> >>
> >>The DAOs, Services and Controllers will by default be singletons in
> >>Spring, and I'd rather keep them that way.  Therefore I can't
> >>explicitly set a DataContext on them within Spring's application
> >>context - they would be shared by all threads.
> >>
> >>Is there a good Spring-friendly way to bind a DataContext to each
> >>thread as it enters my DAOs code? Or perhaps maintain a pool of
> >>DataContext objects to be used by the DAOs?
> >
> >
> > Pool is not a good idea! DataContext itself is lightweight, so creating
> > one on the fly is not a problem. Its value (in addition to storing
> > uncommitted state between requests) is that it caches only objects
> > relevant to a given user session, so there is a high probability of
> > cache reuse. A cached DataContext will simply hog extra memory and
> > won't add much value over the shared cache provided by DataDomain.
> >
> > Now how you do it in Spring, I have no idea... There gotta be an easy
> > way to access user session before you pass control to DAO. Spring
> > couldn't possibly be that popular if all it does is serving stateless
> > applications.. I just don't know what it is. Do you store any other
> > state in the session? How do you access it from controller?
> >
> >
> > Andrus
> >
> > 
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> --
> 
> ____________________________________________________
> Rod Johnson
> CEO, Interface21 - Spring Services from the Source
> http://www.springframework.com
> 
> Founder, Spring Framework:
> http://www.springframework.org
> 
> Author, "Expert One-on-One J2EE Development Without EJB"
> (May 2004, with Juergen Hoeller).
> http://www.amazon.com/exec/obidos/ASIN/0764558315/
> 
> Author, "Expert One-on-One J2EE Design and Development"
> (October 2002).
> http://www.amazon.com/exec/obidos/tg/detail/-/0764543857/
> 
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