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# Copyright 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""WatchdogTimer timeout objects."""
import time
class WatchdogTimer(object):
"""A resetable timeout-based watchdog.
This object is threadsafe.
"""
def __init__(self, timeout):
"""Initializes the watchdog.
Args:
timeout: The timeout in seconds. If timeout is None it will never timeout.
"""
self._start_time = time.time()
self._timeout = timeout
def Reset(self):
"""Resets the timeout countdown."""
self._start_time = time.time()
def GetElapsed(self):
"""Returns the elapsed time of the watchdog."""
return time.time() - self._start_time
def GetRemaining(self):
"""Returns the remaining time of the watchdog."""
if self._timeout:
return self._timeout - self.GetElapsed()
else:
return None
def GetTimeout(self):
"""Returns the timout of the watchdog."""
return self._timeout
def IsTimedOut(self):
"""Whether the watchdog has timed out.
Returns:
True if the watchdog has timed out, False otherwise.
"""
remaining = self.GetRemaining()
return remaining is not None and remaining < 0
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