root / ncclient / subject.py @ a4850088
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1 | 35ad9d81 | Shikhar Bhushan | # Copyright 2009 Shikhar Bhushan
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2 | 35ad9d81 | Shikhar Bhushan | #
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3 | 35ad9d81 | Shikhar Bhushan | # Licensed under the Apache License, Version 2.0 (the "License");
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4 | 35ad9d81 | Shikhar Bhushan | # you may not use this file except in compliance with the License.
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5 | 35ad9d81 | Shikhar Bhushan | # You may obtain a copy of the License at
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6 | 35ad9d81 | Shikhar Bhushan | #
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7 | 35ad9d81 | Shikhar Bhushan | # http://www.apache.org/licenses/LICENSE-2.0
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8 | 35ad9d81 | Shikhar Bhushan | #
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9 | 35ad9d81 | Shikhar Bhushan | # Unless required by applicable law or agreed to in writing, software
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10 | 35ad9d81 | Shikhar Bhushan | # distributed under the License is distributed on an "AS IS" BASIS,
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11 | 35ad9d81 | Shikhar Bhushan | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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12 | 35ad9d81 | Shikhar Bhushan | # See the License for the specific language governing permissions and
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13 | 35ad9d81 | Shikhar Bhushan | # limitations under the License.
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14 | 35ad9d81 | Shikhar Bhushan | |
15 | 35ad9d81 | Shikhar Bhushan | from threading import Lock |
16 | 35ad9d81 | Shikhar Bhushan | |
17 | 35ad9d81 | Shikhar Bhushan | import logging |
18 | 35ad9d81 | Shikhar Bhushan | |
19 | efc6b445 | Shikhar Bhushan | logger = logging.getLogger('ncclient.subject')
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20 | 35ad9d81 | Shikhar Bhushan | |
21 | 35ad9d81 | Shikhar Bhushan | class Subject: |
22 | 35ad9d81 | Shikhar Bhushan | |
23 | 35ad9d81 | Shikhar Bhushan | def __init__(self, listeners=[]): |
24 | 35ad9d81 | Shikhar Bhushan | self._listeners = listeners
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25 | 35ad9d81 | Shikhar Bhushan | self._lock = Lock()
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26 | 35ad9d81 | Shikhar Bhushan | |
27 | 35ad9d81 | Shikhar Bhushan | def has_listener(self, listener): |
28 | 35ad9d81 | Shikhar Bhushan | with self._lock: |
29 | 35ad9d81 | Shikhar Bhushan | return (listener in self._listeners) |
30 | 35ad9d81 | Shikhar Bhushan | |
31 | 35ad9d81 | Shikhar Bhushan | def add_listener(self, listener): |
32 | 35ad9d81 | Shikhar Bhushan | with self._lock: |
33 | 35ad9d81 | Shikhar Bhushan | self._listeners.append(listener)
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34 | 35ad9d81 | Shikhar Bhushan | |
35 | 35ad9d81 | Shikhar Bhushan | def remove_listener(self, listener): |
36 | 35ad9d81 | Shikhar Bhushan | with self._lock: |
37 | 35ad9d81 | Shikhar Bhushan | try:
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38 | 35ad9d81 | Shikhar Bhushan | self._listeners.remove(listener)
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39 | 35ad9d81 | Shikhar Bhushan | except ValueError: |
40 | 35ad9d81 | Shikhar Bhushan | pass
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41 | 35ad9d81 | Shikhar Bhushan | |
42 | 35ad9d81 | Shikhar Bhushan | def dispatch(self, event, *args, **kwds): |
43 | 35ad9d81 | Shikhar Bhushan | with self._lock: |
44 | 35ad9d81 | Shikhar Bhushan | listeners = list(self._listeners) |
45 | 35ad9d81 | Shikhar Bhushan | for l in listeners: |
46 | 35ad9d81 | Shikhar Bhushan | logger.debug('dispatching [%s] to [%s]' % (event, l.__class__))
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47 | 35ad9d81 | Shikhar Bhushan | try:
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48 | 35ad9d81 | Shikhar Bhushan | getattr(l, event)(*args, **kwds)
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49 | 35ad9d81 | Shikhar Bhushan | except Exception as e: |
50 | a4850088 | Shikhar Bhushan | logger.warning(e) |