## There is a problem with this code, which causes the whole process to crash.

defp loop(module, state) do
  new_state = receive do
    {request, sender} ->
      {response, new_state} = module.handle_call(request, state)
      send(sender, {:response, response})
  end
  IO.inspect(new_state)
  loop(module, new_state)
end

# c("server_process2.ex")
# pid = ServerProcess.start(KeyValueStore)
# KeyValueStore.put(pid, :name, :yc)

new_state is returned as {:response, :ok}
module.handle_call( {:get, :name}, {:response, :ok})

## To fix this problem,
## You have to move the loop inside the block
def loop(module, state)
  receive do
    # you can pattern match against the request, to make the request a little clearer
    {request, sender} ->
      {response, new_state} = module.handle_call(request, state)
      loop(module, new_state)
end


# I wonder what happens when you do not have a receive block to handle incoming messages.