| Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame^] | 1 | # Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 | # Use of this source code is governed by a BSD-style license that can be |
| 3 | # found in the LICENSE file. |
| 4 | |
| 5 | import logging |
| 6 | import time |
| 7 | |
| 8 | |
| 9 | class TimeProfile(object): |
| 10 | """Class for simple profiling of action, with logging of cost.""" |
| 11 | |
| 12 | def __init__(self, description='operation'): |
| 13 | self._starttime = None |
| 14 | self._endtime = None |
| 15 | self._description = description |
| 16 | self.Start() |
| 17 | |
| 18 | def Start(self): |
| 19 | self._starttime = time.time() |
| 20 | self._endtime = None |
| 21 | |
| 22 | def GetDelta(self): |
| 23 | """Returns the rounded delta. |
| 24 | |
| 25 | Also stops the timer if Stop() has not already been called. |
| 26 | """ |
| 27 | if self._endtime is None: |
| 28 | self.Stop(log=False) |
| 29 | delta = self._endtime - self._starttime |
| 30 | delta = round(delta, 2) if delta < 10 else round(delta, 1) |
| 31 | return delta |
| 32 | |
| 33 | def LogResult(self): |
| 34 | """Logs the result.""" |
| 35 | logging.info('%s seconds to perform %s', self.GetDelta(), self._description) |
| 36 | |
| 37 | def Stop(self, log=True): |
| 38 | """Stop profiling. |
| 39 | |
| 40 | Args: |
| 41 | log: Log the delta (defaults to true). |
| 42 | """ |
| 43 | self._endtime = time.time() |
| 44 | if log: |
| 45 | self.LogResult() |