new

# File lib/logger.rb, line 668
    def initialize(log = nil, shift_age: nil, shift_size: nil, shift_period_suffix: nil)
      @dev = @filename = @shift_age = @shift_size = @shift_period_suffix = nil
      mon_initialize
      set_dev(log)
      if @filename
        @shift_age = shift_age || 7
        @shift_size = shift_size || 1048576
        @shift_period_suffix = shift_period_suffix || '%Y%m%d'

        unless @shift_age.is_a?(Integer)
          base_time = @dev.respond_to?(:stat) ? @dev.stat.mtime : Time.now
          @next_rotate_time = next_rotate_time(base_time, @shift_age)
        end
      end
    end