gen

gistfile1.ex

defmodule Themost.RateWorker do
  use GenServer

  def start_link do
    :gen_server.start_link({ :local, :NAME }, __MODULE__, ARG, [])
  end

  def init do
    IO.puts "Init"
    :timer.send_interval(:crowl, 15000)
  end

  def handle_info(:crawl, _) do
    IO.puts "Crawl"
  end

end

defmodule Themost.RateWorker do
  use GenServer

  @interval 15_000

  def start_link(url) do
    :gen_server.start_link(__MODULE__, url, [])
  end

  def init(url) do
    IO.puts "Init #{url}"
    :timer.send_interval(:crawl, @interval)
    {:ok, %{url: url}}
  end

  def handle_info(:crawl, state) do
    IO.puts "Crawl #{state.url}"
    {:noreply, state}
  end
end

It can be this as well:

defmodule Themost.RateWorker do
  use GenServer

  @interval 15_000

  def start_link(url) do
    GenServer.start_link(__MODULE__, url)
  end

  def init(url) do
    IO.puts "Init #{url}"
    {:ok, %{url: url}, 0}
  end

  def handle_info(:timeout, state) do
    IO.puts "Crawl #{state.url}"
    {:noreply, state, @interval}
  end
end