David Brown writes:
> Lou,
> I'm not a CORBA expert either, but my understanding is that the biggest
> hurdle to CORBA-EJB direct integration (i.e. CORBA directly invoking EJBs)
> is the requirement for CORBA to have pass-by-value. This comes with CORBA
> 3.0, but I'm not sure which vendors are supporting this yet - we are
> planning to support it in our 5.0 release this year. I have customers that
> have written CORBA services that call their EJBs. I have other customers
> that have a common domain model that is interfaced by both CORBA and EJBs
> concurrently and transactionally. The former is vender neutral, the later
> more performant and easier to write.
>
> IMHO -
> When to use CORBA:
> - long term, 'persistent' connections between two servers
> - whenever threads must be spawned to handle requests asynchronously
> - highly coupled, custom integrations
> - whenever non-Java clients are involved
I'm not sure I agree with these. We use CORBA when we want to use
standard interfaces in a domain. This is in a non-custom integration.
We also use it for transient connections between client and server and
when the service is expected to be re-used by multiple applications. We
also have many people writing clients to a server in which there is no
control over the client code. We also write all of our CORBA code with
Java so that, indeed, non-Java applications can connect. The big CORBA win is
standard interfaces so that we can build a system from multiple vendor
components on different platforms and different languages. I would like
to be able to use the same interfaces with EJB, but this is harder.
We have an example of this in the openmed project at sourceforge
> When to use EJB:
> - client based, 'transient' connecitons between client and server
> - when service is expected to be re-used by multiple applications
> - when you have less or no control over the client code
>
> Hope this helps.
>
> Dave
>
--
David Forslund Voice:(505) 665-1907
Advanced Computing Laboratory, MSB287 FAX: (505) 665-4939
Los Alamos National Laboratory EMAIL: [EMAIL PROTECTED]
Los Alamos, NM 87545 WWW: http://www.acl.lanl.gov/~dwf
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