periodic timer in a OTP gen server

timer_gen_server.erl

%%%-------------------------------------------------------------------
%%% @author Pablo Vieytes <mail@pablovieytes.com>
%%% @copyright (C) 2012, pablo
%%% @doc
%%%
%%% @end
%%% Created : 20 Jan 2012 by Pablo Vieytes <mail@pablovieytes.com> 
%%%-------------------------------------------------------------------
-module(timer_gen_server).

-behaviour(gen_server).

%% API
-export([start_link/0]).

%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
	 terminate/2, code_change/3]).

-define(SERVER, ?MODULE). 

-record(state, {}).

%%%===================================================================
%%% API
%%%===================================================================

start_link() ->
    gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).

%%%===================================================================
%%% gen_server callbacks
%%%===================================================================

init([]) ->
    Milisegs = 1 *1000,
    timer:send_interval(Milisegs, periodic),
    {ok, #state{}}.

handle_call(_Request, _From, State) ->
    Reply = ok,
    {reply, Reply, State}.

handle_cast(_Msg, State) ->
    {noreply, State}.

handle_info(periodic, State) ->
    io:format("timer testing~p", []),
    {noreply, State};

handle_info(_Info, State) ->
    {noreply, State}.

terminate(_Reason, _State) ->
    ok.

code_change(_OldVsn, State, _Extra) ->
    {ok, State}.