Created
July 28, 2017 07:49
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Demonstrates the use of futures in python 3
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| from concurrent.futures import ThreadPoolExecutor | |
| from time import sleep | |
| executor = ThreadPoolExecutor(max_workers=10) | |
| MAX_RUN_TIME = 4.5 | |
| SLEEP_BETWEEN_WAITS = 0.1 | |
| def return_slept(sleep_time): | |
| sleep(sleep_time) | |
| return sleep_time | |
| def main(): | |
| futures = [executor.submit(return_slept, 1.3), executor.submit(return_slept, 2.1)] | |
| results = [] | |
| futures_running = [] | |
| time_slept = 0.0 | |
| while time_slept < MAX_RUN_TIME: | |
| futures_running.clear() | |
| for future in futures: | |
| if future.done(): | |
| # Future is done, append the result. | |
| results.append(future.result()) | |
| else: | |
| # The future is still running, so wait in the next loop | |
| futures_running.append(future) | |
| # If there are no more futures, stop the loop. | |
| if len(futures_running) == 0: | |
| break | |
| # Otherwise, overwrite the futures list with the list of running futures | |
| futures = futures_running.copy() | |
| # And sleep for the maximum amount of time. | |
| sleep(SLEEP_BETWEEN_WAITS) | |
| time_slept += SLEEP_BETWEEN_WAITS | |
| print("Completed after <= {0} seconds".format(time_slept)) | |
| # Cancel the remaining futures. | |
| for future in futures_running: | |
| print("Cancelling future " + str(future)) | |
| future.cancel() | |
| print(str(results)) | |
| if __name__ == '__main__': | |
| main() |
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