new_contents: #
  #	dp for Tornado
  #		YoungYong Park (youngyongpark@gmail.com)
  #		2014.10.23
  #
  
  
  from __future__ import absolute_import
  from engine.helper import Helper as dpHelper
  
  import time
  import datetime
  
  
  class PerformanceMeasurement(object):
      def __init__(self, log_prefix, enabled):
          self._log_prefix = log_prefix
          self._enabled = enabled
  
          if enabled:
              self._begin = datetime.datetime.now()
              self._lap = datetime.datetime.now()
  
      def lap(self, log_suffix='Lap', with_print=True):
          if not self._enabled:
              return
  
          lap = self._lap
          self._lap = datetime.datetime.now()
  
          diff = (self._lap - lap).total_seconds()
  
          if with_print:
              if diff < 0.0001:
                  diff = '0.000100'
  
              print('%s Elapsed : %s secs (%s)' % (self._log_prefix, diff, log_suffix))
  
          return diff
  
      def stop(self, log_suffix='Stop', with_print=True):
          if not self._enabled:
              return
  
          self._stop = datetime.datetime.now()
  
          diff = (self._stop - self._begin).total_seconds()
  
          if with_print:
              if diff < 0.0001:
                  diff = '0.000100'
              
              print('%s Elapsed : %s secs (%s)' % (self._log_prefix, diff, log_suffix))
  
          return diff
  
  
  class PerformanceHelper(dpHelper):
      def start(self, log_prefix='Time', enabled=True):
          return PerformanceMeasurement(log_prefix, enabled)
subject: Add performance measurement helper.