Package flumotion :: Package common :: Module watched
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Source Code for Module flumotion.common.watched

 1  # -*- Mode: Python -*- 
 2  # vi:si:et:sw=4:sts=4:ts=4 
 3  # 
 4  # Flumotion - a streaming media server 
 5  # Copyright (C) 2004,2005,2006,2007 Fluendo, S.L. (www.fluendo.com). 
 6  # All rights reserved. 
 7   
 8  # This file may be distributed and/or modified under the terms of 
 9  # the GNU General Public License version 2 as published by 
10  # the Free Software Foundation. 
11  # This file is distributed without any warranty; without even the implied 
12  # warranty of merchantability or fitness for a particular purpose. 
13  # See "LICENSE.GPL" in the source distribution for more information. 
14   
15  # Licensees having purchased or holding a valid Flumotion Advanced 
16  # Streaming Server license may use this file in accordance with the 
17  # Flumotion Advanced Streaming Server Commercial License Agreement. 
18  # See "LICENSE.Flumotion" in the source distribution for more information. 
19   
20  # Headers in this file shall remain intact. 
21   
22  """abstract data types with built-in notification support 
23  """ 
24   
25  __version__ = "$Rev: 6964 $" 
26   
27 -def _make_watched(type, *mutators):
28 class Watched(type): 29 def __init__(self): 30 type.__init__(self) 31 self.watch_id = 0 32 self.watch_procs = {} # id -> proc
33 34 def watch(self, proc): 35 self.watch_id += 1 36 self.watch_procs[self.watch_id] = proc 37 return self.watch_id 38 39 def unwatch(self, id): 40 del self.watch_procs[id] 41 42 def notify_changed(self): 43 for proc in self.watch_procs.values(): 44 proc(self) 45 46 def mutate(method): 47 def do_mutate(self, *args, **kwargs): 48 method(self, *args, **kwargs) 49 self.notify_changed() 50 setattr(Watched, method.__name__, do_mutate) 51 for i in mutators: 52 mutate(getattr(type, i)) 53 54 return Watched 55 56 WatchedList = _make_watched(list, 'append', 'insert', 'remove', 'pop', 57 'sort', 'reverse') 58 WatchedDict = _make_watched(dict, '__setitem__', '__delitem__', 'pop', 59 'popitem', 'update') 60