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##############################################################################
# Copyright (c) 2015 Huawei Technologies Co.,Ltd and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
import stevedore
class DriverPluginManager(object):
def __init__(self):
self.plugins = {}
self.mgr = stevedore.extension.ExtensionManager(namespace="drivers.plugins", invoke_on_load=True)
def load(self, drivers):
plugin = self.determine_driver_type(drivers)
ext = self.mgr[plugin]
ext.obj.load(drivers)
return True
def clean(self):
self.mgr.map(self._clean)
return True
def _clean(self, ext, *args, **kwargs):
ext.obj.clean()
def get_all_supported_drivers(self):
if not self.plugins:
for ext_name in self.mgr.names():
ext = self.mgr[ext_name]
self.plugins[ext_name] = ext.obj.get_supported_drivers()
return self.plugins
def determine_driver_type(self, drivers):
s = set(drivers)
for plugin, supported in self.get_all_supported_drivers().items():
if not (s - set(supported)):
return plugin
else:
raise Exception('unspported drivers: %s' % drivers)
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