bank.ex

defmodule Bank do
  use Application.Behaviour

  # See http://elixir-lang.org/docs/stable/Application.Behaviour.html
  # for more information on OTP Applications
  def start(_type, _args) do
    Bank.Supervisor.start_link
  end

  def start do
    await
  end

  def await do
    receive do 
      {:check_balance, pid} -> divulge_balance(pid)
    end
    await
  end

  def divulge_balance(pid) do
    send(pid, {:balance, 0})
  end
end