I guess whether or not it makes it into JPA 2.1 is first up to the JPA Spec Lead, and where it may influence an overall Java EE 7 strategy up to those of EE 7.
Luckily Linda is both, so it should be easier for her;-)
Werner
-------- Original-Nachricht --------
> Datum: Mon, 02 Apr 2012 09:39:48 -0500
> Von: Steve Ebersole <steve.ebersole_at_redhat.com>
> An: jsr338-experts_at_jpa-spec.java.net
> CC: Deepak Anupalli <deepak_at_pramati.com>
> Betreff: [jsr338-experts] Re: support for multitenancy
> On Mon 02 Apr 2012 08:14:22 AM CDT, Deepak Anupalli wrote:
> > Linda,
> >
> > Overall the proposal looks fine. However I was expecting an update to
> > JPA from the SaaS standpoint as well ("Application managed SaaS" in
> > your terminology :)), providing more flexibility to be able to work
> > with the prevailing database partitioning/sharding approaches.
> >
> > -Deepak
>
> The SaaS approach certainly adds more complexity. While I certainly
> agree with Deepak here and think this is very widely useful, I guess as
> a group we need to decide if the extra complexity is "worth it". From
> my experience I can say that its actually not as complex as it looks at
> first glance, if that helps. Really it came down to 2 things that
> would affect stock JPA:
>
> 1) Getting Connections. For the SHARED_TABLE approach, this is not any
> different. But for the other 2, the provider will need access to
> tenant-specific Connections. And to date, JPA has not standardized the
> contract for how providers obtain Connections which makes this a little
> tricky.
>
> 2) Segmenting shared cache. Caching of data in the process-scoped,
> shared cache needs to be segmented by each tenant since we are talking
> about the same process. Actually this is a concern anyway in
> implementing PaaS style multi-tenancy depending on how the cache
> provider is deployed, so not sure this is that big of a deal.
>
> Of course, as pointed out before, even if this is deemed outside the
> scope of JPA 2.1, nothing stops the individual providers from
> implementing this support.
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