trove/reddwarf/guestagent/strategy.py
Nikhil Manchanda 595125ac84 Backup and Restore for reddwarf instances.
Implemented backup and restore for reddwarf instances.

Implements spec/consistent-snapshots

Change-Id: Ic1e78545f9e90ab986665a58f524081dcde6894b
2013-05-20 14:16:00 -07:00

75 lines
1.9 KiB
Python

# Copyright 2013 Hewlett-Packard Development Company, L.P.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
import abc
from reddwarf.common import utils
from reddwarf.openstack.common import log as logging
LOG = logging.getLogger(__name__)
class Strategy(object):
__metaclass__ = abc.ABCMeta
__strategy_ns__ = None
__strategy_name__ = None
__strategy_type__ = None
def __init__(self):
self.name = self.get_canonical_name()
LOG.debug("Loaded strategy %s", self.name)
def is_enabled(self):
"""
Is this Strategy enabled?
:retval: Boolean
"""
return True
@classmethod
def get_strategy(cls, name, ns=None):
"""
Load a strategy from namespace
"""
ns = ns or cls.__strategy_ns__
if ns is None:
raise RuntimeError(
'No namespace provided or __strategy_ns__ unset')
LOG.debug('Looking for strategy %s in %s', name, ns)
return utils.import_class(ns + "." + name)
@classmethod
def get_canonical_name(cls):
"""
Return the strategy name
"""
type_ = cls.get_strategy_type()
name = cls.get_strategy_name()
return "%s:%s" % (type_, name)
@classmethod
def get_strategy_name(cls):
return cls.__strategy_name__
@classmethod
def get_strategy_type(cls):
return cls.__strategy_type__