How to enable gRPC server to support just one client connection

Question

I'm currently considering to use gRPC for basically inter-process communication between Java app (client) and C++ server. The RPC calls will use functionality from very old C++ code base which is definitely not thread-safe. Normally the Java client will start more gRPC server instances and have just one connection with each server instance. Is there any way how to ensure this on the gRPC server to accept just one connection and refuse all other attempts for connection. Otherwise I need to introduce some global lock in the RPC functions to have 100% correct server implementation.

Answer 1

There are plans to provide additional server side APIs that will allow the server to decide whether or not to accept an incoming connection, but this is not done yet. For now, a lock is probably a reasonable option.