Dynamic updates of remote object without service interruption

[Nick]

Hi eveybody,

I need some help regarding the mecanism to put in place to be able to
dynamically update a remote object when the assembly where it is defined is
modified, and this whitout having service interruption.

Basically what I'm missing is how do we re-expose a remote object when
assembly has changed, and this without any interruption to the callers.

I have an application that exposes a remoting object (Well known service -
Singleton or singlecall).

It works as follows:

1. Console application starts
2. Console application creates an application domain
3. Shadow copy is enabled on this application domain (so that the assembly
can be changed, it is not locked)
4. Register a HTTP channel in this appDomain.
5. It then loads a specific assembly in the newly created appDomain and
register a well known service using a type found in this assembly.
6. Use FileWatcher to be notified on assembly file change.

Later, the assembly is modified. i now want to restart the service using the
new assembly.

Currently, i just unload the appDomain, then redo step 2 to step 5. Problem
is that there is a short time where the service becomes un-available and
where requests are interrupted.

Questions: How can i restart the service without having service interruption.
The idea is to process current request with old application domain, and
forward new request to new application domain.
Then once all old requests have been processed, the old application domain
can be safely unloaded.
I think i may have to use channel sink but I'm not sure.

How can i achieve this ? I know ASP.NET is using this mecanism extensively
to handle dynamic assembly changes.
Any help, ideas, code samples, etc will be greatly appreciated

--
Nick