new

# File railties/lib/rails/rack/log_tailer.rb, line 6
      def initialize(app, log = nil)
        @app = app

        path = Pathname.new(log || EnvironmentLog).cleanpath
        @cursor = ::File.size(path)
        @last_checked = Time.now.to_f

        @file = ::File.open(path, 'r')
      end