Example code of asynchronous communication using gRPC with goroutine
go get google.golang.org/grpc
Client sends multiple messages asynchronously with go routine. This is useful when client don't need to wait response.
Client send a request asynchronously without immediate response. Client send another request to increase atomic counter on server side. When the counter has value of 2, original request is going to get a response.
It would be useful when a program has both client side and server side. An example of this is relay server. It waits for cilent's request and relay this to the different server. Picture below shows the communication process.
