Re: Ejb Deployment with different datasource

I guess it depends a lot on how the CMP engine manages relationships;
You could just spawn a lot of app server instances and deploy your app
in each. It's the most dirty way to go about it, but probably the
quickest.

Of course with a lot of app servers this isn't feasible unless you've
got a Cray computer. It's likely to work with 100% Java servers(Orion,
JBoss, Pramati, Weblogic).

My 2c,

Juan Pablo Lorandi
Chief Software Architect
Code Foundry Ltd.
[email protected]

Barberstown, Straffan, Co. Kildare, Ireland.
Tel: +353-1-6012050  Fax: +353-1-6012051
Mobile: +353-86-2157900
www.codefoundry.com


> -----Original Message-----
> From: A mailing list for Enterprise JavaBeans development
> [mailto:[email protected]] On Behalf Of Alex Paransky
> Sent: Tuesday, August 05, 2003 5:20 AM
> To: [email protected]
> Subject: Re: Ejb Deployment with different datasource
>
>
> This is the only way that I know of doing this in EJB.  There
> are some negative implications with this:
>
> 1. You really have to deploy another bean with a different
> JNDI name for each datasource 2. Your code, in your client
> application will have to resolve/use different EJB beans. 3.
> If you are using Container Managed Relationships, they would
> have to be re-stated for each bean you deploy
>      a. Any bean which relates to this bean, would have to
> have different relationships specified
>      b. If you relating from this bean to other beans, you
> will need to restate relationships for each bean deployed
> with a different data source
>
> If you are using BMP, then you could encode the datasource in
> the key. Then using the key, you can get the proper resource
> and read from the right database.  Implementing finders,
> however, would be interesting, since you would need to query
> all the datasources.  This might be what you want, or not.
>
> In general, I don't believe there is a nice way to deal with
> this issue in J2EE.
>
> Perhaps you could re-think this requirement and find a
> different method of implementing this task.
>
> Good luck.
>
> --
> -AP_
> http://www.myprofiles.com/member/profile/apara_personal
> http://www.myprofiles.com/member/profile/apara_business
>
>
> Vikram Naik wrote:
>
> > Hello People,
> >
> >     We have a requirement for deploying same ejb multiple
> times with
> > different datasources. I think we can achieve this by deploying the
> > same bean with different datasources with different JNDI
> names. Please
> > suggest your views or implications for doing so .
> >
> > Regards,
> > Vikram Naik
> >
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