129 lines
3.9 KiB
Python
129 lines
3.9 KiB
Python
# Copyright (C) 2011, 2012 Nippon Telegraph and Telephone Corporation.
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# Copyright (C) 2011 Isaku Yamahata <yamahata at valinux co jp>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import itertools
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import logging
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from ryu import utils
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from ryu.controller.handler import register_instance
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LOG = logging.getLogger('ryu.base.app_manager')
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class RyuAppContext(object):
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"""
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Base class for Ryu application context
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"""
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def __init__(self):
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super(RyuAppContext, self).__init__()
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def close(self):
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"""
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teardown method
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The method name, close, is chosen for python context manager
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"""
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pass
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class RyuApp(object):
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"""
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Base class for Ryu network application
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"""
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_CONTEXTS = {}
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@classmethod
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def context_iteritems(cls):
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"""
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Return iterator over the (key, contxt class) of application context
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"""
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return cls._CONTEXTS.iteritems()
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def __init__(self, *_args, **_kwargs):
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super(RyuApp, self).__init__()
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def close(self):
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"""
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teardown method.
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The method name, close, is chosen for python context manager
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"""
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pass
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class AppManager(object):
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def __init__(self):
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self.applications_cls = {}
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self.applications = {}
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self.contexts_cls = {}
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self.contexts = {}
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def load_app(self, name):
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mod = utils.import_module(name)
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for k, v in mod.__dict__.items():
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try:
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if issubclass(v, RyuApp):
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return getattr(mod, k)
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except TypeError:
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pass
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return None
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def load_apps(self, app_lists):
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for app_cls_name in itertools.chain.from_iterable([app_list.split(',')
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for app_list
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in app_lists]):
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LOG.info('loading app %s', app_cls_name)
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# for now, only single instance of a given module
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# Do we need to support multiple instances?
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# Yes, maybe for slicing.
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assert app_cls_name not in self.applications_cls
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cls = self.load_app(app_cls_name)
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if cls is None:
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continue
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self.applications_cls[app_cls_name] = cls
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for key, context_cls in cls.context_iteritems():
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cls = self.contexts_cls.setdefault(key, context_cls)
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assert cls == context_cls
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def create_contexts(self):
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for key, cls in self.contexts_cls.items():
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self.contexts[key] = cls()
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return self.contexts
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def instantiate_apps(self, *args, **kwargs):
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for app_name, cls in self.applications_cls.items():
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# for now, only single instance of a given module
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# Do we need to support multiple instances?
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# Yes, maybe for slicing.
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LOG.info('instantiating app %s', app_name)
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assert app_name not in self.applications
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app = cls(*args, **kwargs)
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register_instance(app)
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self.applications[app_name] = app
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def close(self):
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def close_all(close_dict):
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for app in close_dict:
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close_method = getattr(app, 'close', None)
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if callable(close_method):
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close_method()
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close_dict.clear()
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close_all(self.applications)
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close_all(self.contexts)
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