84 lines
3.0 KiB
Python
84 lines
3.0 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2010 OpenStack, LLC.
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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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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"""
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Scheduler that allows routing some calls to one driver and others to another.
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"""
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from nova import flags
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from nova.openstack.common import cfg
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from nova.openstack.common import importutils
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from nova.scheduler import driver
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multi_scheduler_opts = [
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cfg.StrOpt('compute_scheduler_driver',
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default='nova.scheduler.'
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'filter_scheduler.FilterScheduler',
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help='Driver to use for scheduling compute calls'),
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cfg.StrOpt('volume_scheduler_driver',
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default='nova.scheduler.chance.ChanceScheduler',
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help='Driver to use for scheduling volume calls'),
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]
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FLAGS = flags.FLAGS
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FLAGS.register_opts(multi_scheduler_opts)
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# A mapping of methods to topics so we can figure out which driver to use.
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# There are currently no compute methods proxied through the map
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_METHOD_MAP = {'create_volume': 'volume',
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'create_volumes': 'volume'}
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class MultiScheduler(driver.Scheduler):
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"""A scheduler that holds multiple sub-schedulers.
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This exists to allow flag-driven composibility of schedulers, allowing
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third parties to integrate custom schedulers more easily.
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"""
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def __init__(self):
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super(MultiScheduler, self).__init__()
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compute_driver = importutils.import_object(
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FLAGS.compute_scheduler_driver)
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volume_driver = importutils.import_object(
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FLAGS.volume_scheduler_driver)
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self.drivers = {'compute': compute_driver,
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'volume': volume_driver}
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def __getattr__(self, key):
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if not key.startswith('schedule_'):
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raise AttributeError(key)
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method = key[len('schedule_'):]
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if method not in _METHOD_MAP:
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raise AttributeError(key)
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return getattr(self.drivers[_METHOD_MAP[method]], key)
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def schedule(self, context, topic, method, *_args, **_kwargs):
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return self.drivers[topic].schedule(context, topic,
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method, *_args, **_kwargs)
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def schedule_run_instance(self, *args, **kwargs):
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return self.drivers['compute'].schedule_run_instance(*args, **kwargs)
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def schedule_prep_resize(self, *args, **kwargs):
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return self.drivers['compute'].schedule_prep_resize(*args, **kwargs)
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