48 lines
1.3 KiB
Python
48 lines
1.3 KiB
Python
# Copyright 2017 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 classes for storage engines."""
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import abc
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from oslo_config import cfg
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from oslo_db import api as db_api
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import six
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_BACKEND_MAPPING = {'sqlalchemy': 'cyborg.db.sqlalchemy.api'}
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IMPL = db_api.DBAPI.from_config(cfg.CONF,
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backend_mapping=_BACKEND_MAPPING,
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lazy=True)
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def get_instance():
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"""Return a DB API instance."""
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return IMPL
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@six.add_metaclass(abc.ABCMeta)
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class Connection(object):
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"""Base class for storage system connections."""
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@abc.abstractmethod
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def __init__(self):
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"""Constructor."""
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# accelerator
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@abc.abstractmethod
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def accelerator_create(self, context, values):
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"""Create a new server type."""
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