You can add as many services as you like to a single server (using 
RegisterService call).

Check out the following post for a better (but complicated sample) 
https://groups.google.com/forum/#!topic/grpc-io/DuBDpK96B14 . It does not 
show multiple services but that part is not complicated. 

On Wednesday, July 19, 2017 at 8:32:35 PM UTC-7, [email protected] wrote:
>
> Hi, I'm trying to understand how to convert an application using 
> synchronous RPC to asynchronous. My old method for synchronous 
> communication was calling RegisterService on all my services, then calling 
> Wait() on the server after it was created. The gRPC library would decide 
> which Service function to call from that point. 
>
> When I look at the async C++ example, the beginning looks very similar 
> where the services are added, and BuildAndStart is called. But instead of 
> calling Wait(). HandleRpcs is called as the busy loop. However, it looks 
> like HandleRpcs is only handling a single type of service. I don't see any 
> examples of adding multiple services anywhere, so I'm not sure how that's 
> handled. Does it imply that I would have to make essentially a separate 
> ServerImpl class for every type of service?
>

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