d6827d7a23
Use import_class(), import_object(), and import_module() from openstack-common's importutils module. The equivalent functions have been removed from nova.utils. A few modules had import order cleaned up in passing, as well. My initial motivation for this was to remove some more usage of nova bits from nova.rpc as another step towards being able to move nova.rpc import openstack-common. Since I was pulling importutils into nova, I went ahead and converted the whole thing. Change-Id: I7c7786cf0001bcd06db52b9a99ff4284a3f6c6fa
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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