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periodic.py
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periodic.py
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# -*- coding: utf-8 -*-
"""
tornadio.flashserver
~~~~~~~~~~~~~~~~~~~~
This module implements customized PeriodicCallback from tornado with
support of the sliding window.
:copyright: (c) 2011 by the Serge S. Koval, see AUTHORS for more details.
:license: Apache, see LICENSE for more details.
"""
import time, logging
class Callback(object):
def __init__(self, callback, callback_time, io_loop):
self.callback = callback
self.callback_time = callback_time
self.io_loop = io_loop
self._running = False
def calculate_next_run(self):
return time.time() + self.callback_time / 1000.0
def start(self, timeout=None):
self._running = True
if timeout is None:
timeout = self.calculate_next_run()
self.io_loop.add_timeout(timeout, self._run)
def stop(self):
self._running = False
def _run(self):
if not self._running:
return
next_call = None
try:
next_call = self.callback()
except (KeyboardInterrupt, SystemExit):
raise
except:
logging.error("Error in periodic callback", exc_info=True)
self.start(next_call)