79 lines
2.0 KiB
Python
79 lines
2.0 KiB
Python
# Copyright 2013 Hewlett-Packard Development Company, L.P.
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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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import abc
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from oslo_log import log as logging
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import six
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from trove.common.i18n import _
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from trove.common import utils
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LOG = logging.getLogger(__name__)
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@six.add_metaclass(abc.ABCMeta)
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class Strategy(object):
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__strategy_ns__ = None
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__strategy_name__ = None
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__strategy_type__ = None
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def __init__(self):
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self.name = self.get_canonical_name()
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LOG.debug("Loaded strategy %s", self.name)
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def is_enabled(self):
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"""
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Is this Strategy enabled?
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:retval: Boolean
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"""
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return True
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@classmethod
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def get_strategy(cls, name, ns=None):
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"""
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Load a strategy from namespace
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"""
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ns = ns or cls.__strategy_ns__
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if ns is None:
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raise RuntimeError(
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_('No namespace provided and __strategy_ns__ unset'))
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LOG.debug('Looking for strategy %s in %s', name, ns)
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return utils.import_class(ns + "." + name)
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@classmethod
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def get_canonical_name(cls):
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"""
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Return the strategy name
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"""
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type_ = cls.get_strategy_type()
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name = cls.get_strategy_name()
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return "%s:%s" % (type_, name)
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@classmethod
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def get_strategy_name(cls):
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return cls.__strategy_name__
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@classmethod
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def get_strategy_type(cls):
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return cls.__strategy_type__
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