registry.ex

defmodule UID.Registry do
  @moduledoc """
  """

  use GenServer

  @doc """
  Link the Registry with the current process.
  """
  def start_link(opts \\ []) do
    GenServer.start_link(__MODULE__, 1, opts)
  end

  @doc ~S"""
  Generate a new unique identifier starting at 1.

  ## Examples

    iex> {:ok, pid} = UID.Registry.start_link
    ...> UID.Registry.generate_uid(pid)
    1 
  """
  def generate_uid(pid) do
    GenServer.call(pid, :get_uid)
  end

  def handle_call(:get_uid, _from, state) do
    {:reply, state, state + 1}
  end
end