root / src / listener.py @ 7fc7ca73
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1 | 7fc7ca73 | Shikhar Bhushan | # Copyright 2009 Shikhar Bhushan
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2 | 7fc7ca73 | Shikhar Bhushan | #
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3 | 7fc7ca73 | Shikhar Bhushan | # Licensed under the Apache License, Version 2.0 (the "License");
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4 | 7fc7ca73 | Shikhar Bhushan | # you may not use this file except in compliance with the License.
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5 | 7fc7ca73 | Shikhar Bhushan | # You may obtain a copy of the License at
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6 | 7fc7ca73 | Shikhar Bhushan | #
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7 | 7fc7ca73 | Shikhar Bhushan | # http://www.apache.org/licenses/LICENSE-2.0
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8 | 7fc7ca73 | Shikhar Bhushan | #
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9 | 7fc7ca73 | Shikhar Bhushan | # Unless required by applicable law or agreed to in writing, software
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10 | 7fc7ca73 | Shikhar Bhushan | # distributed under the License is distributed on an "AS IS" BASIS,
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11 | 7fc7ca73 | Shikhar Bhushan | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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12 | 7fc7ca73 | Shikhar Bhushan | # See the License for the specific language governing permissions and
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13 | 7fc7ca73 | Shikhar Bhushan | # limitations under the License.
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14 | 7fc7ca73 | Shikhar Bhushan | |
15 | 7fc7ca73 | Shikhar Bhushan | class Subject: |
16 | 7fc7ca73 | Shikhar Bhushan | |
17 | 7fc7ca73 | Shikhar Bhushan | def __init__(self, listeners=[]): |
18 | 7fc7ca73 | Shikhar Bhushan | self._listeners = listeners
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19 | 7fc7ca73 | Shikhar Bhushan | |
20 | 7fc7ca73 | Shikhar Bhushan | def has_listener(self, listener): |
21 | 7fc7ca73 | Shikhar Bhushan | return (listener in self._listeners) |
22 | 7fc7ca73 | Shikhar Bhushan | |
23 | 7fc7ca73 | Shikhar Bhushan | def add_listner(self, listener): |
24 | 7fc7ca73 | Shikhar Bhushan | self._listeners.append(listener)
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25 | 7fc7ca73 | Shikhar Bhushan | |
26 | 7fc7ca73 | Shikhar Bhushan | def remove_listener(self, listener): |
27 | 7fc7ca73 | Shikhar Bhushan | self._listeners.remove(listener)
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28 | 7fc7ca73 | Shikhar Bhushan | |
29 | 7fc7ca73 | Shikhar Bhushan | def dispatch(self, event, *args, **kwds): |
30 | 7fc7ca73 | Shikhar Bhushan | try:
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31 | 7fc7ca73 | Shikhar Bhushan | func = getattr(Listener, event)
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32 | 7fc7ca73 | Shikhar Bhushan | for l in listeners: |
33 | 7fc7ca73 | Shikhar Bhushan | func(l, data) |
34 | 7fc7ca73 | Shikhar Bhushan | except AttributeError: |
35 | 7fc7ca73 | Shikhar Bhushan | pass
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36 | 7fc7ca73 | Shikhar Bhushan | |
37 | 7fc7ca73 | Shikhar Bhushan | class Listener: |
38 | 7fc7ca73 | Shikhar Bhushan | |
39 | 7fc7ca73 | Shikhar Bhushan | @override
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40 | 7fc7ca73 | Shikhar Bhushan | def reply(self, *args, **kwds): |
41 | 7fc7ca73 | Shikhar Bhushan | raise NotImplementedError |
42 | 7fc7ca73 | Shikhar Bhushan | |
43 | 7fc7ca73 | Shikhar Bhushan | @override
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44 | 7fc7ca73 | Shikhar Bhushan | def error(self, *args, **kwds): |
45 | 7fc7ca73 | Shikhar Bhushan | raise NotImplementedError |