This is a super simple process that will set an env value when started (e.g. as the last process in your application supervision tree) to indicate the application is ready for traffic.

Put this as the last process in application.ex.

See also: Fast.Plug.Ready

Example usage:

defmodule MyApp.Application do
  use Application

  def start(_type, _args) do
    children = [
      ...
    ] ++ [{Fast.Application.Ready, otp_app: :my_app}]

    opts = [strategy: :one_for_one, name: MyApp.Supervisor]
    Supervisor.start_link(children, opts)
  end
end