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Re: Ozone & EJBs

On Fri, 05 Jan 2001, Per Nyfelt wrote:
> I've been developing EJB's using J2EE for a couple of years, mainly
> SilverStream and, recently, JBoss. It is possible to use Ozone for
> SessionBeans today but I have been thinking about trying to do something to
> make it possible to use Ozone for Entity beans as well -maybe creating an
> EntityPersistanceManager to handle the job?

I'm not sure if this possible. Things like activation of objecs is already
there in ozone. ozone is not just a persistent store but also an execution
environment of the objects. So it is some kind of a application server itself.
Do you think an EntityPersistanceManager is enough to integrate the
functionality of ozone into jBoss?

> Then on the other hand the connector architecture in the next version of
> J2EE (2.0) might provide another way to use Ozone together with a J2EE
> application server. 

I'm not sure again. From what I've read the connector architecture seems to be
a very general JDBC architecture. Like JDBC it solves some API problems but
doesn't bridge the gap between OO and R (or any other SQL problem). Where do you
think the connector architecture can help to integrate ozone into an EJB server
/ jBoss?

> I think convenience and features are more important than
> performance when considering this. It would be great if JBoss and Ozone
> could work together easily so that one could easily create an OO view of
> relational data with J2EE for the legacy systems and then use Ozone for new
> applications and as a front end developer you would have one way of
> accessing objects and calling business methods that would combine the power
> of EJB's with Ozone.

This would indeed be very cool and I started the dicussion with Marc exactly
for this reasons.

> 
> Do you or did Mark have any ideas on possible ways of integrating the two?

Not really. To me it seemed that Marc wasn't aware of the (EJB) container-ish
nature of an OODBMS. I'm still in the opinion that ozone could be an EJB
container (not that I think that I'm able to do this) while Marc wanted
something that just stores objects. This is more or less where we stopped
discussion. I'm sure that there are other possibilities but I'm way to
unfamiliar with EJB and jBoss to know them ;)


Falko

> 
> Best regards,
> Per
> 
> ----- Original Message -----
> From: "Falko Braeutigam" <falko@smb-tec.com>
> To: "Jay Abraham" <ejb700@yahoo.com>; <ozone-users@ozone-db.org>
> Sent: Friday, January 05, 2001 4:56 PM
> Subject: Re: Ozone & EJBs
> 
> 
> > On Fri, 05 Jan 2001, Jay Abraham wrote:
> > > How is Ozone intended to be used with Application
> > > Servers for EJB based J2EE applications?  I notice
> > > that the J2EE framework seems to focus on RDBMS
> > > and ORDBMS datasources with hardly any mention of
> > > ODBMS datasources.
> >
> > I did check this with Mark Fleury of jBoss some time ago. And we did
> indeed
> > come to the conclusion that ozone is to container-ish itself to be easily
> used
> > as a simple data source for a container. Since ozone provides RMI,
> > transactions, permissions already it seems that ozone itself could be a
> > container. But as you mentioned J2EE focuses on RDBMS. A benchmark of EJB
> > compared to ozone could help to see if an OO container could provide any
> > advantages over a RDBMS container. Any EJB experiences out there?
> >
> >
> > Falko
> > --
> > ______________________________________________________________________
> > Falko Braeutigam                              mailto:falko@smb-tec.com
> > SMB GmbH                                        http://www.smb-tec.com
> >
> >
-- 
______________________________________________________________________
Falko Braeutigam                              mailto:falko@smb-tec.com
SMB GmbH                                        http://www.smb-tec.com