4dd1118b7d
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
146 lines
4.5 KiB
Python
146 lines
4.5 KiB
Python
# Copyright (C) 2011 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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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, version 3 of the License.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import copy
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import logging
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import weakref
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from gevent.queue import Queue
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LOG = logging.getLogger('ryu.controller.dispatcher')
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class EventQueue(object):
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# WeakSet: This set is populated by __init__().
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# So need to use weak reference in order to make instances
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# freeable by avoiding refrence count.
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# Otherwise, instances can't be freed.
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event_queues = weakref.WeakSet()
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def __init__(self, name, dispatcher):
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self.event_queues.add(self)
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self.name = name
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self.dispatcher = dispatcher
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self.is_dispatching = False
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self.ev_q = Queue()
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def set_dispatcher(self, dispatcher):
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self.dispatcher = dispatcher
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def queue_raw(self, ev):
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self.ev_q.put(ev)
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class _EventQueueGuard(object):
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def __init__(self, ev_q):
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self.ev_q = ev_q
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def __enter__(self):
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self.ev_q.is_dispatching = True
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def __exit__(self, type_, value, traceback):
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self.ev_q.is_dispatching = False
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return False
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def queue(self, ev):
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if self.is_dispatching:
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self.queue_raw(ev)
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return
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with self._EventQueueGuard(self):
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assert self.ev_q.empty()
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self.dispatcher(ev)
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while not self.ev_q.empty():
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ev = self.ev_q.get()
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self.dispatcher(ev)
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class EventDispatcher(object):
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# WeakSet: This set is populated by __init__().
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# So need to use weak reference in order to make instances
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# freeable by avoiding refrence count.
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# Otherwise, instances can't be freed.
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event_dispatchers = weakref.WeakSet()
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def __init__(self, name):
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self.event_dispatchers.add(self)
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self.name = name
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self.events = {}
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self.all_handlers = []
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def register_all_handler(self, all_handler):
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self.all_handlers.append(all_handler)
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def unregister_all_handler(self, all_handler):
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del self.all_handlers[all_handler]
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def register_handler(self, ev_cls, handler):
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assert callable(handler)
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self.events.setdefault(ev_cls, [])
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self.events[ev_cls].append(handler)
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def register_handlers(self, handlers):
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for ev_cls, h in handlers:
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self.register_handler(ev_cls, h)
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def unregister_handler(self, ev_cls, handler):
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del self.events[ev_cls][handler]
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def register_static(self, ev_cls):
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'''helper decorator to statically register handler for event class'''
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def register(handler):
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'''helper decorator to register handler statically '''
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if isinstance(handler, staticmethod):
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# class staticmethod is not callable.
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handler = handler.__func__
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self.register_handler(ev_cls, handler)
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return handler
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return register
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def __call__(self, ev):
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self.dispatch(ev)
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def dispatch(self, ev):
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#LOG.debug('dispatch %s', ev)
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# copy handler list because the list is not stable.
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# event handler may block/switch thread execution
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# and un/register other handlers. And more,
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# handler itself may un/register handlers.
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all_handlers = copy.copy(self.all_handlers)
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for h in all_handlers:
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ret = h(ev)
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if ret is False:
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break
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if ev.__class__ not in self.events:
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LOG.info('unhandled event %s', ev)
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return
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# Is this necessary?
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#
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# copy handler list because the list is not stable.
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# event handler may block/switch thread execution
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# and un/register other handlers.
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#
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handlers = copy.copy(self.events[ev.__class__])
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for h in handlers:
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ret = h(ev)
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if ret is False:
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break
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