8eac5e2db7
Renames the AgentStatusCheckWorker class to PeriodicWorker and moves it into the worker module since there isn't anything agent-specific about it and it can be used for other periodic jobs server side. TrivialFix Change-Id: Ic7a55ef534f64e6bfc60ae38bb0e139a0078510b
126 lines
4.0 KiB
Python
126 lines
4.0 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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from oslo_service import loopingcall
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from oslo_service import service
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from neutron.callbacks import events
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from neutron.callbacks import registry
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from neutron.callbacks import resources
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class WorkerSupportServiceMixin(object):
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@property
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def _workers(self):
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try:
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return self.__workers
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except AttributeError:
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self.__workers = []
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return self.__workers
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def get_workers(self):
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"""Returns a collection NeutronWorker instances needed by this service
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"""
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return list(self._workers)
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def add_worker(self, worker):
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"""Adds NeutronWorker needed for this service
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If a object needs to define workers thread/processes outside of API/RPC
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workers then it will call this method to register worker. Should be
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called on initialization stage before running services
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"""
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self._workers.append(worker)
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def add_workers(self, workers):
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"""Adds NeutronWorker list needed for this service
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The same as add_worker but adds a list of workers
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"""
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self._workers.extend(workers)
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class NeutronWorker(service.ServiceBase):
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"""Partial implementation of the ServiceBase ABC
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Subclasses will still need to add the other abstract methods defined in
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service.ServiceBase. See oslo_service for more details.
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If a plugin needs to handle synchronization with the Neutron database and
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do this only once instead of in every API worker, for instance, it would
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define a NeutronWorker class and the plugin would have get_workers return
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an array of NeutronWorker instances. For example:
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class MyPlugin(...):
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def get_workers(self):
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return [MyPluginWorker()]
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class MyPluginWorker(NeutronWorker):
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def start(self):
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super(MyPluginWorker, self).start()
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do_sync()
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"""
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# default class value for case when super().__init__ is not called
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_worker_process_count = 1
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def __init__(self, worker_process_count=_worker_process_count):
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"""
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Initialize worker
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:param worker_process_count: Defines how many processes to spawn for
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worker:
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0 - spawn 1 new worker thread,
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1..N - spawn N new worker processes
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"""
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self._worker_process_count = worker_process_count
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@property
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def worker_process_count(self):
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return self._worker_process_count
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def start(self):
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if self.worker_process_count > 0:
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registry.notify(resources.PROCESS, events.AFTER_INIT, self.start)
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class PeriodicWorker(NeutronWorker):
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"""A worker that runs a function at a fixed interval."""
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def __init__(self, check_func, interval, initial_delay):
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super(PeriodicWorker, self).__init__(worker_process_count=0)
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self._check_func = check_func
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self._loop = None
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self._interval = interval
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self._initial_delay = initial_delay
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def start(self):
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super(PeriodicWorker, self).start()
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if self._loop is None:
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self._loop = loopingcall.FixedIntervalLoopingCall(self._check_func)
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self._loop.start(interval=self._interval,
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initial_delay=self._initial_delay)
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def wait(self):
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if self._loop is not None:
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self._loop.wait()
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def stop(self):
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if self._loop is not None:
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self._loop.stop()
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def reset(self):
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self.stop()
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self.wait()
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self.start()
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