Coverage for keystone.common.manager : 100%

# vim: tabstop=4 shiftwidth=4 softtabstop=4 

# Copyright 2012 OpenStack LLC 

# 

# 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 functools 

from keystone.openstack.common import importutils 

class Manager(object): 

    """Base class for intermediary request layer. 

    The Manager layer exists to support additional logic that applies to all 

    or some of the methods exposed by a service that are not specific to the 

    HTTP interface. 

    It also provides a stable entry point to dynamic backends. 

    An example of a probable use case is logging all the calls. 

    """ 

    def __init__(self, driver_name): 

        self.driver = importutils.import_object(driver_name) 

    def __getattr__(self, name): 

        """Forward calls to the underlying driver.""" 

        # NOTE(termie): context is the first argument, we're going to strip 

        #               that for now, in the future we'll probably do some 

        #               logging and whatnot in this class 

        f = getattr(self.driver, name) 

        @functools.wraps(f) 

        def _wrapper(context, *args, **kw): 

            return f(*args, **kw) 

        setattr(self, name, _wrapper) 

        return _wrapper