[omniORB] How to write single threaded hydrid application..

[Visscher, Bruce]

> Cool. Didn't know that. But it still won't work if client and 
> server share one 
> thread, wouldn't it?

It sounds like you are having to use something that is inherently thread
unsafe.

I think that rather than trying to have a single threaded server (whether
or not it happens to also be a client of something else doesn't really
matter) that a better idea might be to avoid having to have a servant
in such an environment.  You could then use something like the CosEvents
or CosNotification service as a buffering mechanism.

I.e., instead of a single threaded server, make that address space a
pull consumer client.  Then you could periodically poll the event channel
using the try_pull method.  Then what would have been a client under your
original design becomes a push supplier client of the event channel.

So, if you have a properly functioning CosEvents or CosNotification service
then you don't have to have any servers of your own at all and the threading
issue goes away.

Henning and Vinoski describes this as the "Hybrid Push/Pull Model".

Caveat: I haven't actually tried this but I think it would be an
interesting way to solve this problem that I see posted quite often here
and on comp.object.corba.  I have also encountered situations where
multithreading must be avoided in (e.g.) some legacy applications.

Of course, you wouldn't have to use the actual CosEvents or CosNotification
service interface, but if you were starting from scratch that might be
a good place to start.

I would be interested in anyone that might have some actual experience 
doing something like this.

Bruce

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