39 lines
699 B
Elixir
39 lines
699 B
Elixir
defmodule Counter.Store do
|
|
use GenServer
|
|
|
|
# client
|
|
def start_link(file) do
|
|
GenServer.start_link(__MODULE__, file, name: __MODULE__)
|
|
end
|
|
|
|
def put(value) do
|
|
GenServer.cast(__MODULE__, {:put, value})
|
|
end
|
|
|
|
def get() do
|
|
GenServer.call(__MODULE__, :get)
|
|
end
|
|
|
|
# server
|
|
@impl true
|
|
def init(file) do
|
|
{:ok, file}
|
|
end
|
|
|
|
@impl true
|
|
def handle_call(:get, _from, file) do
|
|
reply =
|
|
case File.read(file) do
|
|
{:ok, content} -> :erlang.binary_to_term(content)
|
|
_ -> nil
|
|
end
|
|
{:reply, reply, file}
|
|
end
|
|
|
|
@impl true
|
|
def handle_cast({:put, value}, file) do
|
|
File.write(file, :erlang.term_to_binary(value))
|
|
{:noreply, file}
|
|
end
|
|
end
|