def short_key
      key = @@key
      return "" if key.nil? || key.empty?
      key[0..3] + "..." + key[(key.length - 4)..(key.length - 1)]
    end
def short_key
      key = @@key
      return "" if key.nil? || key.empty?
      key[0..3] + "..." + key[(key.length - 4)..(key.length - 1)]
    end
:nodoc: