rails--rails/actionpack/lib/action_controller/abstract/benchmarker.rb

module AbstractController
  module Benchmarker
    extend ActiveSupport::DependencyModule

    depends_on Logger

    module ClassMethods
      def benchmark(title, log_level = ::Logger::DEBUG, use_silence = true)
        if logger && logger.level >= log_level
          result = nil
          ms = Benchmark.ms { result = use_silence ? silence { yield } : yield }
          logger.add(log_level, "#{title} (#{('%.1f' % ms)}ms)")
          result
        else
          yield
        end
      end

      # Silences the logger for the duration of the block.
      def silence
        old_logger_level, logger.level = logger.level, ::Logger::ERROR if logger
        yield
      ensure
        logger.level = old_logger_level if logger
      end
    end
  end
end