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| import random # for simulate init fail | |
| import contextlib | |
| def simulate_init_fail(threshold=50): | |
| if random.randint(1, 100) <= threshold: | |
| print('Init fail') | |
| raise RuntimeError('Simulate initialization fail.') | |
| print('Init OK') | |
| def init_process1(): | |
| print('This is init_process1') | |
| simulate_init_fail(20) | |
| def init_process2(): | |
| print('This is init_process2') | |
| simulate_init_fail(40) | |
| def init_process3(): | |
| print('This is init_process3') | |
| simulate_init_fail(60) | |
| def release_process1(): | |
| print('This is release_process1') | |
| def release_process2(): | |
| print('This is release_process2') | |
| def release_process3(): | |
| print('This is release_process3') | |
| @contextlib.contextmanager | |
| def init_phase(): | |
| with contextlib.ExitStack() as stack: | |
| init_process1() | |
| stack.callback(release_process1) | |
| init_process2() | |
| stack.callback(release_process2) | |
| init_process3() | |
| stack.callback(release_process3) | |
| yield | |
| def init_phase_no_release_if_success(): | |
| with contextlib.ExitStack() as stack: | |
| init_process1() | |
| stack.callback(release_process1) | |
| init_process2() | |
| stack.callback(release_process2) | |
| init_process3() | |
| stack.callback(release_process3) | |
| # Initialize other things here... | |
| # ... | |
| stack.pop_all() | |
| def main(): | |
| try: | |
| with init_phase(): | |
| print('Do something...') | |
| # Another solution that will not invoke release if init success. | |
| #init_phase_no_release_if_success() | |
| #print('Do something...') | |
| except Exception as ex: | |
| print('Error:', ex) | |
| if __name__ == '__main__': | |
| main() |
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