module Log::Registry
  def get(subject)
    register(subject)
  end

  def register(subject)
    subject_name = subject_name(subject)

    instance = registry[subject_name]

    if instance.nil?
      instance = build(subject)
      registry[subject_name] = instance
    end

    instance
  end

  def registry
    @registry ||= {}
  end
end