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piazza_core

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Simple building blocks for building elixir web apps

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piazza_core lib utils graceful_shutdown.ex
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lib/utils/graceful_shutdown.ex 

defmodule Piazza.GracefulShutdown do

  @moduledoc """

  Genserver to handle graceful shutdowns of an application. Configure

  with:



  ```

  config :piazza_core,

    shutdown_delay: delay_in_ms

  ```

  And placd it at the beginning of you application supervision tree.

  """

  use GenServer

  require Logger



  @shutdown_delay Application.get_env(:piazza_core, :shutdown_delay) || 0



  def start_link(args \\ :ok) do

    GenServer.start_link(__MODULE__, args, name: __MODULE__)

  end



  def init(args) do

    Process.flag(:trap_exit, true)

    {:ok, args}

  end



  def terminate(_, _) do

    Logger.info "Terminating after #{@shutdown_delay} ms"

    :timer.sleep(@shutdown_delay)

  end

end