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root / ncclient / subject.py @ a4850088

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# Copyright 2009 Shikhar Bhushan
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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 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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from threading import Lock
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import logging
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logger = logging.getLogger('ncclient.subject')
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class Subject:
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    def __init__(self, listeners=[]):
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        self._listeners = listeners
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        self._lock = Lock()
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    def has_listener(self, listener):
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        with self._lock:
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            return (listener in self._listeners)
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    def add_listener(self, listener):
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        with self._lock:
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            self._listeners.append(listener)
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    def remove_listener(self, listener):
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        with self._lock:
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            try:
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                self._listeners.remove(listener)
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            except ValueError:
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                pass
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    def dispatch(self, event, *args, **kwds):
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        with self._lock:
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            listeners = list(self._listeners)
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        for l in listeners:
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            logger.debug('dispatching [%s] to [%s]' % (event, l.__class__))
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            try:
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                getattr(l, event)(*args, **kwds)
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            except Exception as e:
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                logger.warning(e)