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Money functions for operations on and localization of a money data type with support for ISO 4217 currencies and ISO 24165 digial tokens (crypto currencies).

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ex_money lib money application.ex
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lib/money/application.ex 

defmodule Money.Application do

  use Application

  alias Money.ExchangeRates

  require Logger



  @start_service_by_default? false



  def start(_type, _args) do

    import Supervisor.Spec, warn: false



    children = if start_exchange_rate_service?() do

      [supervisor(Money.ExchangeRates.Supervisor, [])]

    else

      []

    end



    opts = [strategy: :one_for_one, name: Money.Supervisor]

    Supervisor.start_link(children, opts)

  end



  # Default is to not start the exchange rate service

  defp start_exchange_rate_service? do

    start? = Money.get_env(:exchange_rate_service, @start_service_by_default?)

    api_module = ExchangeRates.default_config().api_module

    api_module_present? = Code.ensure_loaded?(api_module)



    if start? && !api_module_present? do

      Logger.error "ExchangeRates api module #{api_module_name(api_module)} could not be loaded. " <>

        "  Does it exist?"

      Logger.warn "ExchangeRates service will not be started."

    end



    start? && api_module_present?

  end



  defp api_module_name(name) when is_atom(name) do

    name

    |> Atom.to_string

    |> String.replace_leading("Elixir.", "")

  end



  defp api_module_name(name) do

    name

  end



end