new

# File railties/lib/rails/rack/log_tailer.rb, line 4
      def initialize(app, log = nil)
        @app = app

        path = Pathname.new(log || "#{::File.expand_path(Rails.root)}/log/#{Rails.env}.log").cleanpath

        @cursor = @file = nil
        if ::File.exists?(path)
          @cursor = ::File.size(path)
          @file = ::File.open(path, 'r')
        end
      end