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  1. """An example of the mark and recapture decorator pattern, 
  2. designed to make connecting bound methods as callbacks easy.
  3. Gareth Latty <gareth@lattyware.co.uk> 
  4. http://b...content-available-to-author-only...o.uk/post/29793030567/mark-and-recapture-decorators-in-python"""
  5.  
  6. import inspect
  7.  
  8. def connect(signal, f):
  9. 	print(signal, f)
  10.  
  11. def naive_callback(*args):
  12. 	def decorate(f):
  13. 		connect(args, f)
  14. 		return f
  15. 	return decorate
  16.  
  17. def callback(*args):
  18.     def decorate(f):
  19.         try:
  20.             f._marks.add(args)
  21.         except AttributeError:
  22.             f._marks = {args}
  23.         return f
  24.     return decorate
  25.  
  26. def connect_callbacks(obj):
  27.     for _, f in inspect.getmembers(obj, inspect.ismethod):
  28.         try:
  29.             for mark in f.__func__._marks:
  30.                 connect(mark, f)
  31.         except AttributeError:
  32.              pass
  33.  
  34. class Test:
  35. 	def __init__(self):
  36. 		connect_callbacks(self)
  37.  
  38. 	@naive_callback("test")
  39. 	def test1():
  40. 		pass
  41.  
  42. 	@callback("test")
  43. 	def test2():
  44. 		pass
  45.  
  46. test = Test()
Success #stdin #stdout 0.06s 6324KB
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Standard input is empty
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('test',) <function test1 at 0xb72bf06c>
('test',) <bound method Test.test2 of <__main__.Test object at 0xb72bb9ec>>
https://ideone.com/KaEtH
language:
Python 3 (python  3.9.5)
created:
12 years ago
visibility:
public

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