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  1.  
  2.  
  3. def handle(exception, callback):
  4. 	def inner(wrapped):
  5. 		def f(self, *args, **kwargs):
  6. 			try:
  7. 				return wrapped(self, *args, **kwargs)
  8. 			except exception as exc:
  9. 				callback(self)
  10. 				self.rollback()
  11. 				return 'retry' # enum action result retry value
  12. 		return f
  13. 	return inner
  14.  
  15.  
  16. def print_action(msg, action):
  17. 	print(msg.format(action=action.__class__.__name__))
  18.  
  19.  
  20. class Action:
  21.  
  22. 	def run(self):
  23. 		pass
  24.  
  25. 	def rollback(self):
  26. 		print_action('Rolling back {action}', self)
  27.  
  28.  
  29. class A1(Action):
  30.  
  31. 	def run(self):
  32. 		print_action('Running {action}', self)
  33.  
  34.  
  35. class A2(A1):
  36.  
  37. 	@handle(
  38. 		RuntimeError,
  39. 		lambda action: print_action('Handle RuntimeError for action {action}', action)
  40. 	)
  41. 	def run(self):
  42. 		raise RuntimeError()
  43.  
  44. class A3(A2):
  45.  
  46. 	@handle(
  47. 		ValueError,
  48. 		lambda action: print_action('Handle ValueError for action {action}', action)
  49. 	)
  50. 	@handle(
  51. 		IndexError,
  52. 		lambda action: print_action('Handle IndexError for action {action}', action)
  53. 	)
  54. 	def run(self):
  55. 		raise ValueError()
  56.  
  57.  
  58. a1 = A1()
  59. a1.run()
  60.  
  61. a2 = A2()
  62. a2.run()
  63.  
  64. a3 = A3()
  65. a3.run()
  66.  
  67.  
Success #stdin #stdout 0.02s 8984KB
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Running A1
Handle RuntimeError for action A2
Rolling back A2
Handle ValueError for action A3
Rolling back A3
https://ideone.com/vhh2HO
language:
Python 3 (python  3.9.5)
created:
1 year ago
visibility:
secret

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