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# Copyright 2014 Tesora, Inc.
# 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
import six
from trove.guestagent.strategy import Strategy
@six.add_metaclass(abc.ABCMeta)
class Replication(Strategy):
"""Base class for Replication Strategy implementation."""
__strategy_type__ = 'replication'
__strategy_ns__ = 'trove.guestagent.strategies.replication'
def __init__(self, context):
self.context = context
super(Replication, self).__init__()
@abc.abstractmethod
def get_master_ref(self, service, snapshot_info):
"""Get reference to master site for replication strategy."""
@abc.abstractmethod
def snapshot_for_replication(self, context, service, location,
snapshot_info):
"""Capture snapshot of master db."""
@abc.abstractmethod
def enable_as_master(self, service, snapshot_info):
"""Configure underlying database to act as master for replication."""
@abc.abstractmethod
def enable_as_slave(self, service, snapshot):
"""Configure underlying database as a slave of the given master."""
@abc.abstractmethod
def detach_slave(self, service):
"""Turn off replication on a slave site."""
@abc.abstractmethod
def demote_master(self, service):
"""Turn off replication on a master site."""
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