Question on busy resource

[adrieng1977]

Hi
This is not really an issue but more so a question.

I am finally able to submit requests to my https services using ribbon.

First here are some of my constraints:
My remote services are single threaded and can only process 1 request at a time.
My remote services cannot scale at will.

What kind of setup should i use to have the incoming request wait for a service to be done with its task.
Is there a way to tell ribbon that when a service is used, that it is not available for others and that they should wait for 1 to be available.

I am currently using the IPing PingUrl to be more efficient in determining if a server is up or not, and I am using the IRule retryRule.

My service throws an exception when a new request is coming and that one is already being processed.

Would it make sense to have a custom IPing for that scenario?

thank you