:queue vs genstage state

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5

E.g. compare:

  def handle_demand(demand, queue) when demand > 0 do
    {events, new_state} =
      case :queue.len(queue) > demand do
        true ->
          {head_queue, tail_queue} = :queue.split(demand, queue)
          {:queue.to_list(head_queue), tail_queue}

        false ->
          {:queue.to_list(queue), :queue.new()}
      end

    {:noreply, events, new_state}
  end

to

  def handle_demand(demand, state) when demand > 0 do
    {events, new_state} = Enum.split(state, demand)
    {:noreply, events, new_state}
  end