# Copyright 2012 OpenStack Foundation
#
# 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.
"""This module provides support for dependency injection.
WARNING: Use the ``keystone.common.provider_api`` module instead. This module
is going away in favor of an implementation that is better about following the
dependency injection model:
https://en.wikipedia.org/wiki/Dependency_injection
"""
from keystone.common import provider_api
from keystone.i18n import _
REGISTRY = provider_api.ProviderAPIs
GET_REQUIRED = object()
GET_OPTIONAL = object()
[docs]class UnresolvableDependencyException(Exception):
"""Raised when a required dependency is not resolvable.
See ``resolve_future_dependencies()`` for more details.
"""
def __init__(self, name, targets):
msg = _('Unregistered dependency: %(name)s for %(targets)s') % {
'name': name, 'targets': targets}
super(UnresolvableDependencyException, self).__init__(msg)
[docs]def resolve_future_dependencies(__provider_name=None):
"""Deprecated, does nothing."""
return {}
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