142 lines
4.2 KiB
Python
142 lines
4.2 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright(C) 2010-2011 Romain Bignon, Christophe Benz
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#
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# This file is part of weboob.
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#
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# weboob is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# weboob is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with weboob. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import print_function
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from threading import Event, RLock
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try:
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from threading import _Timer as Timer
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except ImportError:
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from threading import Timer
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from weboob.tools.log import getLogger
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from weboob.tools.misc import get_backtrace
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__all__ = ['Scheduler']
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class IScheduler(object):
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def schedule(self, interval, function, *args):
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raise NotImplementedError()
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def repeat(self, interval, function, *args):
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raise NotImplementedError()
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def cancel(self, ev):
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raise NotImplementedError()
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def run(self):
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raise NotImplementedError()
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def want_stop(self):
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raise NotImplementedError()
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class RepeatedTimer(Timer):
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def run(self):
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while not self.finished.isSet():
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try:
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self.function(*self.args, **self.kwargs)
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except Exception:
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# do not stop timer because of an exception
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print(get_backtrace())
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self.finished.wait(self.interval)
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self.finished.set()
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class Scheduler(IScheduler):
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def __init__(self):
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self.logger = getLogger('scheduler')
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self.mutex = RLock()
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self.stop_event = Event()
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self.count = 0
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self.queue = {}
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def schedule(self, interval, function, *args):
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return self._schedule(Timer, interval, self._schedule_callback, function, *args)
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def repeat(self, interval, function, *args):
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return self._schedule(RepeatedTimer, interval, self._repeat_callback, function, *args)
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def _schedule(self, klass, interval, meta_func, function, *args):
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if self.stop_event.isSet():
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return
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with self.mutex:
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self.count += 1
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self.logger.debug('function "%s" will be called in %s seconds' % (function.__name__, interval))
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timer = klass(interval, meta_func, (self.count, interval, function, args))
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self.queue[self.count] = timer
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timer.start()
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return self.count
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def _schedule_callback(self, count, interval, function, args):
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with self.mutex:
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self.queue.pop(count)
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return function(*args)
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def _repeat_callback(self, count, interval, function, args):
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function(*args)
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with self.mutex:
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try:
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e = self.queue[count]
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except KeyError:
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return
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else:
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self.logger.debug('function "%s" will be called in %s seconds' % (function.__name__, e.interval))
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def cancel(self, ev):
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with self.mutex:
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try:
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e = self.queue.pop(ev)
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except KeyError:
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return False
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e.cancel()
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self.logger.debug('scheduled function "%s" is canceled' % e.function.__name__)
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return True
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def _wait_to_stop(self):
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self.want_stop()
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with self.mutex:
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for e in self.queue.itervalues():
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e.cancel()
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e.join()
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self.queue = {}
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def run(self):
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try:
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while True:
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self.stop_event.wait(0.1)
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except KeyboardInterrupt:
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self._wait_to_stop()
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raise
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else:
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self._wait_to_stop()
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return True
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def want_stop(self):
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self.stop_event.set()
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with self.mutex:
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for t in self.queue.itervalues():
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t.cancel()
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# Contrary to _wait_to_stop(), don't call t.join
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# because want_stop() have to be non-blocking.
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self.queue = {}
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