b9da5e1675
These usages are not really needed and can just be eliminated since they offer no benefit (and coverage may classify them as dead/useless code). Change-Id: I951c4cb9216a19ce37dc8fc390ae905fd525a3c7
130 lines
4.0 KiB
Python
130 lines
4.0 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2013 Rackspace Hosting Inc. 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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import abc
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import six
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from taskflow.persistence import logbook
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@six.add_metaclass(abc.ABCMeta)
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class Backend(object):
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"""Base class for persistence backends."""
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def __init__(self, conf):
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if not conf:
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conf = {}
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if not isinstance(conf, dict):
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raise TypeError("Configuration dictionary expected not '%s' (%s)"
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% (conf, type(conf)))
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self._conf = conf
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@abc.abstractmethod
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def get_connection(self):
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"""Return a Connection instance based on the configuration settings."""
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@abc.abstractmethod
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def close(self):
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"""Closes any resources this backend has open."""
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@six.add_metaclass(abc.ABCMeta)
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class Connection(object):
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"""Base class for backend connections."""
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@abc.abstractproperty
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def backend(self):
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"""Returns the backend this connection is associated with."""
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@abc.abstractmethod
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def close(self):
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"""Closes any resources this connection has open."""
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@abc.abstractmethod
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def upgrade(self):
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"""Migrate the persistence backend to the most recent version."""
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@abc.abstractmethod
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def clear_all(self):
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"""Clear all entries from this backend."""
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@abc.abstractmethod
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def validate(self):
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"""Validates that a backend is still ok to be used.
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The semantics of this *may* vary depending on the backend. On failure a
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backend specific exception should be raised that will indicate why the
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failure occurred.
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"""
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@abc.abstractmethod
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def update_atom_details(self, atom_detail):
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"""Updates a given atom details and returns the updated version.
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NOTE(harlowja): the details that is to be updated must already have
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been created by saving a flow details with the given atom detail inside
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of it.
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"""
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@abc.abstractmethod
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def update_flow_details(self, flow_detail):
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"""Updates a given flow details and returns the updated version.
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NOTE(harlowja): the details that is to be updated must already have
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been created by saving a logbook with the given flow detail inside
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of it.
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"""
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@abc.abstractmethod
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def save_logbook(self, book):
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"""Saves a logbook, and all its contained information."""
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@abc.abstractmethod
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def destroy_logbook(self, book_uuid):
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"""Deletes/destroys a logbook matching the given uuid."""
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@abc.abstractmethod
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def get_logbook(self, book_uuid, lazy=False):
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"""Fetches a logbook object matching the given uuid."""
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@abc.abstractmethod
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def get_logbooks(self, lazy=False):
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"""Return an iterable of logbook objects."""
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@abc.abstractmethod
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def get_flows_for_book(self, book_uuid):
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"""Return an iterable of flowdetails for a given logbook uuid."""
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@abc.abstractmethod
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def get_flow_details(self, fd_uuid, lazy=False):
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"""Fetches a flowdetails object matching the given uuid."""
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@abc.abstractmethod
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def get_atom_details(self, ad_uuid):
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"""Fetches a atomdetails object matching the given uuid."""
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@abc.abstractmethod
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def get_atoms_for_flow(self, fd_uuid):
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"""Return an iterable of atomdetails for a given flowdetails uuid."""
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def _format_atom(atom_detail):
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return {
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'atom': atom_detail.to_dict(),
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'type': logbook.atom_detail_type(atom_detail),
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}
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