105 lines
3.1 KiB
Python
105 lines
3.1 KiB
Python
# 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. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import time
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import eventlet
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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_service import threadgroup
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LOG = logging.getLogger(__name__)
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wallclock = time.time
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class ThreadGroupManager(object):
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"""Thread group manager."""
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def __init__(self):
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super(ThreadGroupManager, self).__init__()
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self.threads = {}
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self.group = threadgroup.ThreadGroup()
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# Create dummy service task, because when there is nothing queued
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# on self.tg the process exits
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self.add_timer(cfg.CONF.scheduler.periodic_interval,
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self._service_task)
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def _service_task(self):
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"""Dummy task which gets queued on the service.Service threadgroup.
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Without this service.Service sees nothing running i.e has nothing to
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wait() on, so the process exits..
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This could also be used to trigger periodic non-cluster-specific
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housekeeping tasks
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(Yanyan)Not sure this is still necessary, just keep it temporarily.
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"""
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# TODO(Yanyan): have this task call dbapi purge events
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pass
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def start(self, func, *args, **kwargs):
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"""Run the given method in a sub-thread."""
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return self.group.add_thread(func, *args, **kwargs)
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def add_timer(self, interval, func, *args, **kwargs):
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"""Define a periodic task to be run in the thread group.
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The task will be executed in a separate green thread.
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Interval is from cfg.CONF.periodic_interval
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"""
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self.group.add_timer(interval, func, *args, **kwargs)
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def stop_timers(self):
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self.group.stop_timers()
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def stop(self, graceful=False):
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"""Stop any active threads belong to this threadgroup."""
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# Try to stop all threads gracefully
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self.group.stop(graceful)
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self.group.wait()
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# Wait for link()ed functions (i.e. lock release)
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threads = self.group.threads[:]
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links_done = dict((th, False) for th in threads)
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def mark_done(gt, th):
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links_done[th] = True
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for th in threads:
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th.link(mark_done, th)
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while not all(links_done.values()):
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eventlet.sleep()
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def reschedule(action, sleep_time=1):
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"""Eventlet Sleep for the specified number of seconds.
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:param sleep_time: seconds to sleep; if None, no sleep;
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"""
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if sleep_time is not None:
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LOG.debug('Action %s sleep for %s seconds' % (
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action.id, sleep_time))
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eventlet.sleep(sleep_time)
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def sleep(sleep_time):
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"""Interface for sleeping."""
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eventlet.sleep(sleep_time)
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