ex_trainer/lib/wabanex/application.ex

defmodule Wabanex.Application do
  @moduledoc false

  use Application

  def start(_type, _args) do
    children = [
      Wabanex.PromEx,
      Wabanex.Repo,
      WabanexWeb.Telemetry,
      {Phoenix.PubSub, name: Wabanex.PubSub},
      {DNSCluster,
       query: Application.get_env(:wabanex, :dns_cluster_query) || :ignore,
       log: :info,
       resolver: Application.get_env(:wabanex, :dns_cluster_resolver) || DNSCluster.Resolver},
      WabanexWeb.Endpoint
    ]

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

  def config_change(changed, _new, removed) do
    WabanexWeb.Endpoint.config_change(changed, removed)
    :ok
  end
end