06c6c4691b
In this changeset, I implemented a background scheduler service for Watcher and more particularly for the Decision Engine where I made it create 2 types of job per cluster data model collector plugin: - An initial job that is asynchronously executed upon starting the Decision Engine - A periodical job that gets triggered every configurable interval of time Change-Id: I3f5442f81933a19565217b894bd86c186e339762 Partially-Implements: bluprint cluster-model-objects-wrapper
92 lines
2.8 KiB
Python
92 lines
2.8 KiB
Python
# -*- encoding: utf-8 -*-
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# Copyright (c) 2016 b<>com
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# 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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import datetime
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import eventlet
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from oslo_log import log
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from watcher.common import exception
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from watcher.common import scheduling
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from watcher.metrics_engine.cluster_model_collector import manager
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LOG = log.getLogger(__name__)
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class DecisionEngineSchedulingService(scheduling.BackgroundSchedulerService):
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def __init__(self, gconfig=None, **options):
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gconfig = None or {}
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super(DecisionEngineSchedulingService, self).__init__(
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gconfig, **options)
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self.collector_manager = manager.CollectorManager()
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@property
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def collectors(self):
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return self.collector_manager.get_collectors()
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def add_sync_jobs(self):
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for name, collector in self.collectors.items():
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timed_task = self._wrap_collector_sync_with_timeout(
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collector, name)
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self.add_job(timed_task,
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trigger='interval',
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seconds=collector.config.period,
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next_run_time=datetime.datetime.now())
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def _as_timed_sync_func(self, sync_func, name, timeout):
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def _timed_sync():
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with eventlet.Timeout(
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timeout,
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exception=exception.ClusterDataModelCollectionError(cdm=name)
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):
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sync_func()
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return _timed_sync
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def _wrap_collector_sync_with_timeout(self, collector, name):
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"""Add an execution timeout constraint on a function"""
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timeout = collector.config.period
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def _sync():
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try:
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timed_sync = self._as_timed_sync_func(
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collector.synchronize, name, timeout)
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timed_sync()
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except Exception as exc:
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LOG.exception(exc)
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collector.set_cluster_data_model_as_stale()
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return _sync
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def start(self):
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"""Start service."""
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self.add_sync_jobs()
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super(DecisionEngineSchedulingService, self).start()
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def stop(self):
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"""Stop service."""
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self.shutdown()
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def wait(self):
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"""Wait for service to complete."""
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def reset(self):
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"""Reset service.
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Called in case service running in daemon mode receives SIGHUP.
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"""
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