[grpc-io] Grpc Java server test for ServerInterceptors

[John Wilson]

  Hi Grpc team! 
I have a ServerInterceptor instance for my grpc server, it does something 
like this:

@Override
    public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
            ServerCall<ReqT, RespT> call, Metadata headers, 
ServerCallHandler<ReqT, RespT> next) {
        Context context = Context.current();
        .... // more code here 
        context = context.withValue(USER_ID, "my-user-id");
        return Contexts.interceptCall(context, call, headers, next);
    }

and in my service method I get access to the userId using smth like this:

USER_ID.get()


I have some questions:
Is this implementation correct?
Is this thread safe?
Is there any way to test that implementation?
Is there any documentation that I can check to understand how Threads are 
handled by the grpc server?

Thanks in advance! :) 

Edu-

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