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OpenStack Study: loadables.py

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# Copyright (c) 2011-2012 OpenStack Foundation

# 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.

"""

Generic Loadable class support.

Meant to be used by such things as scheduler filters and weights where we

want to load modules from certain directories and find certain types of

classes within those modules. Note that this is quite different than

generic plugins and the pluginmanager code that exists elsewhere.

Usage:

Create a directory with an __init__.py with code such as:

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class SomeLoadableClass(object):

pass

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