Re: AW: Inbound / Outbound communication in JCA 1.5

On Wednesday, January 22, 2003, at 02:47 PM, Gyhra, Norman wrote:

> Hi David!
>
>>> * Synchronous inbound:
>>>   How can my J2EE application be synchronously called
>>>   by an EIS through the Connector Architecture?
>>
>> Work interface/contracts. [...]
>
> As far as I have understood the purpose of the
> Work Management Contract, it emulates multi-threading
> for the resource adapter, which cannot spawn threads
> by itself. The specification does not mention anything
> about communication with the EIS.

True enough, but I sure don't know how to write something that listens
for e.g. socket messages and interprets them as ejb method invocations
them without having at least one thread for the listener and a thread
pool or factory for the execution threads, should you want concurrent
execution of requests.  If your EIS already knows how to look up the
desired ejb in jndi and use the remote and home interfaces, obviously
you don't need an adapter for it to call ejbs.   Otherwise I think
there are obvious advantages to running whatever does the translation
from EIS-speak to ejb invocation in the app server jvm.  In this case
the Work/WorkManager interfaces seem like the only spec-compatible
choice to me.

For a rather primitive and unfinished example of this (not in an
adapter per se) look at the JBoss TrunkInvoker in cvs head (JBoss 4).

david jencks
>
> It says on page 125:
> "Goals:
> * Provide a flexible work execution model to handle the
>   thread needs of a resource adapter.
> * Provide a mechanism for an application server to pool
>   and reuse threads, and to exercise more control over thread
>   behavior in a managed environment."
>
>
> Regards,
> Norman
>
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