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October 16, 2021 18:23
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""" AB/PP/6: Asynchronous Producer/Consumer: 2. Message queue orchestrated by the consumer | |
""" | |
import asyncio | |
class Producer(object): | |
def __init__(self, outp): | |
self.isStop = False | |
self.outp = outp | |
async def run(self): | |
i = 1 | |
while True: | |
if self.isStop: | |
await self.outp.put('STOP') | |
break | |
await self.outp.put('Round {}'.format(i)) | |
await self.outp.join() # 1 | |
i += 1 | |
async def stop(self, delay: int): | |
await asyncio.sleep(delay) | |
self.isStop = True | |
class Consumer(object): | |
def __init__(self): | |
self.inp = asyncio.Queue() | |
async def run(self): | |
while True: | |
message = await self.inp.get() | |
if message == 'STOP': | |
self.inp.task_done() # 2 | |
break | |
print(message) | |
await asyncio.sleep(2) | |
self.inp.task_done() | |
print('[End of input]') | |
async def main(): | |
aConsumer = Consumer() | |
aProducer = Producer(aConsumer.inp) | |
await asyncio.gather( | |
aProducer.stop(20), | |
aProducer.run(), | |
aConsumer.run() | |
) | |
input() | |
if __name__ == '__main__': | |
asyncio.run(main()) |
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