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

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):

        try:

            func = getattr(Listener, event)

            with self._lock:

                for l in listeners:

                    func(l, *args, **kwds)

        except AttributeError:

            pass

class Listener:

    """Abstract class for NETCONF protocol message listeners, defining 2 events:

    - reply

    - error

    """

    @override

    def reply(self, *args, **kwds):

        raise NotImplementedError

    @override

    def error(self, *args, **kwds):

        raise NotImplementedError