elixir OTP reminders

supervision_with_child_spec.exs

defmodule MyMod do
  use GenServer
  
  def child_spec(args) do
    IO.inspect(args, label: "*** MyMod.child_spec/1")
    %{
      id: __MODULE__,
      start: {__MODULE__, :start_link, [args]}
    }
  end

  def start_link(args) do
    IO.inspect(args, label: "*** MyMod.start_link/1")
    GenServer.start_link(__MODULE__, args)
  end
  
  def init(args) do
    IO.inspect(args, label: "*** MyMod.init/1")
    {:ok, args}
  end
end

# {:ok, sup_pid} = Supervisor.start_link([MyMod], name: MySup, strategy: :one_for_one)
{:ok, sup_pid} = Supervisor.start_link([{MyMod, test: :value}], name: MySup, strategy: :one_for_one)
Supervisor.stop(sup_pid)

# *** MyMod.child_spec/1: [test: :value]
# *** MyMod.start_link/1: [test: :value]
# *** MyMod.init/1: [test: :value]