69 lines
2.2 KiB
Python
69 lines
2.2 KiB
Python
# Copyright 2016 Huawei Technologies Co.,LTD.
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# All Rights Reserved.
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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. 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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"""Base engine manager functionality."""
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from eventlet import greenpool
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from oslo_service import periodic_task
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from oslo_utils import importutils
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from nimble.common.i18n import _
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from nimble.common import rpc
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from nimble.conf import CONF
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from nimble.db import api as dbapi
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class BaseEngineManager(periodic_task.PeriodicTasks):
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def __init__(self, host, topic):
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super(BaseEngineManager, self).__init__(CONF)
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if not host:
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host = CONF.host
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self.host = host
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self.topic = topic
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self.node_cache = {}
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self.node_cache_time = 0
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scheduler_driver = CONF.scheduler.scheduler_driver
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self.scheduler = importutils.import_object(scheduler_driver)
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self.notifier = rpc.get_notifier()
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self._started = False
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def init_host(self):
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"""Initialize the engine host.
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:param admin_context: the admin context to pass to periodic tasks.
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:raises: RuntimeError when engine is already running.
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"""
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if self._started:
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raise RuntimeError(_('Attempt to start an already running '
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'engine manager'))
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self.dbapi = dbapi.get_instance()
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self._worker_pool = greenpool.GreenPool(
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size=CONF.engine.workers_pool_size)
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# Refresh node cache on startup
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self._refresh_cache()
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self._started = True
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def del_host(self):
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self._worker_pool.waitall()
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self._started = False
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def periodic_tasks(self, context, raise_on_error=False):
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return self.run_periodic_tasks(context, raise_on_error=raise_on_error)
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