Created
January 6, 2014 22:16
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Elixir gen_server example
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| defmodule Tcprpc.Server do | |
| use GenServer.Behaviour | |
| defrecord State, port: nil, lsock: nil, request_count: 0 | |
| def start_link(port) do | |
| :gen_server.start_link({ :local, :tcprcp }, __MODULE__, port, []) | |
| end | |
| def start_link() do | |
| start_link 1055 | |
| end | |
| def get_count() do | |
| :gen_server.call(:tcprcp, :get_count) | |
| end | |
| def stop() do | |
| :gen_server.cast(:tcprcp, :stop) | |
| end | |
| def init (port) do | |
| { :ok, lsock } = :gen_tcp.listen(port, [{ :active, true }]) | |
| { :ok, State.new(lsock: lsock, port: port), 0 } | |
| end | |
| def handle_call(:get_count, _from, state) do | |
| { :reply, { :ok, state.request_count }, state } | |
| end | |
| def handle_cast(:stop , state) do | |
| { :noreply, state } | |
| end | |
| def handle_info({ :tcp, socket, raw_data}, state) do | |
| do_rpc socket, raw_data | |
| { :noreply, state.update_request_count(fn(x) -> x + 1 end) } # inc? | |
| end | |
| def handle_info(:timeout, state = State[lsock: lsock]) do | |
| { :ok, _sock } = :gen_tcp.accept lsock | |
| { :noreply, state } | |
| end | |
| def do_rpc(socket, raw_data) do | |
| try do | |
| result = Code.eval_string(raw_data) | |
| :gen_tcp.send(socket, :io_lib.fwrite("~p~n", [result])) | |
| catch | |
| error -> :gen_tcp.send(socket, :io_lib.fwrite("~p~n", [error])) | |
| end | |
| end | |
| end |
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This is by far the most explicit and valuable info on
:gen_serveralong with:gen_tcp. The:gen_serverpart could however strongly benefit on being rewritten using the Elixir'sGenServerwrapper.👍