Tyler Jewell wrote:
>
> ...
> 3)
> Consider the following scenario: An MDB creates an EJB instance and converts
> the remote interface to its Handle equivalent. The MDB then sends a
> response message to a Topic that contains the Handle of the newly created
> EJB. The Topic has many consumers, some of them remote clients. I know
> that this sounds ludicrous and is probably a very bad design, but I'm trying
> to cover possible architecture ideas that may arise. Would this be a
> scenario where an MDB does some business processing; At the completion of
> the business processing, there is a large amount of in-memory data that a
> variety of clients might like to view. Instead of sending the data back to
> all interested clients via a JMS Topic message, might it be possible for a
> bean to create a stateful Session Bean and send the remote Handle to the
> Topic instead of the data? Granted, the clients will have to synchronize
> access to the stateful bean, but they could access the data at their leisure
> without using an entity bean. Ok, let me know if I'm off my rocker, but if
> I'm crazy enough to think up this scenario, I'm sure someone else might be,
> too.
Hello,
I agree with the responses of Bjarne Rasmussen on your
different questions, however, about this last point, I've got
a problem. In the EJB spec, it is said that a session bean
always executes on behalf of a SINGLE client, i.e. it cannot
be shared among several clients (as entity beans do). Handles
on session beans may be used by a single client, when a client
session needs to be temporarily suspended. I do not think that
several clients may use a same session bean, and an EJB
server will certainly not assume synchronisation of accesses to
a session bean.
Best Regards,
Fran�ois
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