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# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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
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# distributed under the License is distributed on an "AS IS" BASIS,
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"""A BeamPlugin base class.
For experimental usage only; no backwards-compatibility guarantees.
# pytype: skip-file
"""Plugin base class to be extended by dependent users such as FileSystem.
Any instantiated subclass will be imported at worker startup time."""
"""Get all the subclasses of the BeamPlugin class."""
all_subclasses = 
for subclass in cls.__subclasses__():
"""Get full import paths of the BeamPlugin subclass."""
return o.__module__ + "." + o.__name__
return [fullname(o) for o in cls.get_all_subclasses()]