I'll take a stab at your questions.
> -----Original Message-----
> From: Sven-Uwe Meyer [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, March 03, 1999 7:50 AM
> To: [EMAIL PROTECTED]
> Subject: Re: IDL from EJB
>
> Chris Raber wrote:
> >
> > The EJB CORBA mapping specification describes how this should work.
> >
> > It is a question of whether a particular vendor supports it or not.
> > GemStone/J
> > for example is built on top of CORBA, so we will be able to support this
> > eventually. We are not quite there yet. In the interim you can create a
> > CORBA
> > object and expose it's IDL to CORBA client, and have the implementation
> > of that CORBA object simply turn around and invoke on EJB's.
>
> I'm in the phase of having to decide if i use RMI or CORBA for my
> proof-of-concept-prototype (based on Gemstone/J 2.01) and I'm not quite
> sure if i understand the topic (and problems) fully.
>
> - Is this really or problem ? Do i really have to decide now to use RMI
> or CORBA now.
>
As an EJB developer the transport level is transparent. The semantics are
like
RMI, but the underlying mechanism might actually be CORBA/IIOP. This is how
GemStone/J is archictected.
> - would it make sense to use RMI now (easier ?) aand "upgrade" to CORBA
> later ?
>
>From a developers standpoint, it makes no difference. The CORBA
infrastructure
provides a richer backbone for EJB assuming a CosTransaction services is
there.
> - could I write my clients using RMI and use RMI over IIOP later so that
> i don't have to change my code to use CORBA ?
>
You could do this, but you won't have to change code wither way. One defines
home and remote interfaces and bean implementations to the EJB standard and
an EJB server gives them life in the context of RMI or CORBA/IIOP. The
semantics
of the object distribution to the developer are always RMI'ish.
> - ... or would it be possible (with not too much overhead) to put all
> RMI/CORBA-specific code in some extra layer/classes so that i only have
> to replace them later ?
>
The only CORBA specific code would be if you have non-EJB clients which are
CORBA based, talking to EJBs.
> - is (will) there a (automatic) way to use CORBA instead of RMI later
> (just redeploying on a CORBA-capable EJB-server/container) ?
>
Yes. This is true today!
> thanks to anybody who takes some time to clarify this topic,
>
At your service.
> sven
> --
> -----------------------------------------------------------------------
> Sven-Uwe Meyer
> Gruner+Jahr Electronic Media Service GmbH tel. : +49-40-370 377 29
> Am Baumwall 11 fax. : +49-40-370 377 57
> 20459 Hamburg
> Germany email : [EMAIL PROTECTED]
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