17bf3db06a
Remove line containing comment - # vim: tabstop=4 shiftwidth=4 softtabstop=4 Change-Id: I7581cc88b8de433d5609ed06c6570b0b45c13573 Closes-Bug:#1229324
116 lines
3.4 KiB
Python
116 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
# Copyright (C) 2013 Rackspace Hosting 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
|
|
|
|
|
|
@six.add_metaclass(abc.ABCMeta)
|
|
class Backend(object):
|
|
"""Base class for persistence backends."""
|
|
|
|
def __init__(self, conf):
|
|
if not conf:
|
|
conf = {}
|
|
if not isinstance(conf, dict):
|
|
raise TypeError("Configuration dictionary expected not: %s"
|
|
% type(conf))
|
|
self._conf = conf
|
|
|
|
@abc.abstractmethod
|
|
def get_connection(self):
|
|
"""Return a Connection instance based on the configuration settings."""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def close(self):
|
|
"""Closes any resources this backend has open."""
|
|
pass
|
|
|
|
|
|
@six.add_metaclass(abc.ABCMeta)
|
|
class Connection(object):
|
|
"""Base class for backend connections."""
|
|
|
|
@abc.abstractproperty
|
|
def backend(self):
|
|
"""Returns the backend this connection is associated with."""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def close(self):
|
|
"""Closes any resources this connection has open."""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def upgrade(self):
|
|
"""Migrate the persistence backend to the most recent version."""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def clear_all(self):
|
|
"""Clear all entries from this backend."""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def validate(self):
|
|
"""Validates that a backend is still ok to be used (the semantics
|
|
of this vary depending on the backend). On failure a backend specific
|
|
exception is raised that will indicate why the failure occurred.
|
|
"""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def update_task_details(self, task_detail):
|
|
"""Updates a given task details and returns the updated version.
|
|
|
|
NOTE(harlowja): the details that is to be updated must already have
|
|
been created by saving a flow details with the given task detail inside
|
|
of it.
|
|
"""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def update_flow_details(self, flow_detail):
|
|
"""Updates a given flow details and returns the updated version.
|
|
|
|
NOTE(harlowja): the details that is to be updated must already have
|
|
been created by saving a logbook with the given flow detail inside
|
|
of it.
|
|
"""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def save_logbook(self, book):
|
|
"""Saves a logbook, and all its contained information."""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def destroy_logbook(self, book_uuid):
|
|
"""Deletes/destroys a logbook matching the given uuid."""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def get_logbook(self, book_uuid):
|
|
"""Fetches a logbook object matching the given uuid."""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def get_logbooks(self):
|
|
"""Return an iterable of logbook objects."""
|
|
pass
|