67 lines
2.2 KiB
Python
67 lines
2.2 KiB
Python
#
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# Copyright (c) 2015 EUROGICIEL
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import sys
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from eventlet import event
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from eventlet import greenthread
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from cerberus.openstack.common.gettextutils import _LE, _LW # noqa
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from cerberus.openstack.common import log as logging
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from cerberus.openstack.common import loopingcall
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from cerberus.openstack.common import timeutils
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LOG = logging.getLogger(__name__)
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class CerberusFixedIntervalLoopingCall(loopingcall.FixedIntervalLoopingCall):
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"""A fixed interval looping call."""
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def start(self, interval, initial_delay=None):
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self._running = True
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done = event.Event()
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def _inner():
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if initial_delay:
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greenthread.sleep(initial_delay)
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try:
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while self._running:
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start = timeutils.utcnow()
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self.f(*self.args, **self.kw)
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end = timeutils.utcnow()
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if not self._running:
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break
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delay = interval - timeutils.delta_seconds(start, end)
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if delay <= 0:
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LOG.warn(_LW('task run outlasted interval by %s sec') %
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-delay)
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greenthread.sleep(delay if delay > 0 else 0)
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except loopingcall.LoopingCallDone as e:
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self.stop()
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done.send(e.retvalue)
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except Exception:
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LOG.exception(_LE('in fixed duration looping call'))
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done.send_exception(*sys.exc_info())
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return
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else:
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done.send(True)
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self.done = done
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self.gt = greenthread.spawn(_inner)
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return self.done
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