ncclient:NETCONF Python client

# Copyright 2009 Shikhar Bhushan

#

# Licensed 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

#

#    http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

from threading import Lock

import logging

logger = logging.getLogger('ncclient.listener')

class Subject:

    'Thread-safe abstact class for event-dispatching subjects'

    def __init__(self, listeners=[]):

        self._listeners = listeners

        self._lock = Lock()

    def has_listener(self, listener):

        with self._lock:

            return (listener in self._listeners)

    def add_listener(self, listener):

        with self._lock:

            self._listeners.append(listener)

    def remove_listener(self, listener):

        with self._lock:

            try:

                self._listeners.remove(listener)

            except ValueError:

                pass

    def dispatch(self, event, *args, **kwds):

        with self._lock:

            for l in self._listeners:

                try:

                    getattr(l, event)(*args, **kwds)

                except Exception as e:

                    logger.warning(e)

if __name__=="__main__":

    logging.basicConfig(level=logging.DEBUG)

    class Listener:

        def reply(self, data):

            print data

        def error(self, err_info):

            print err_info

    subject = Subject()        

    subject.add_listener(Listener())

    subject.dispatch('reply', 'hello world')

    subject.dispatch('error', 'bye world')

    subject.dispatch('undefined', 'happy deliverin')