python异步任务队列示例

程序员文章站 2022-04-19 11:46:46

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很多场景为了不阻塞，都需要异步回调机制。这是一个简单的例子，大家参考使用吧

复制代码代码如下:

#!/usr/bin/env python
# -*- coding: UTF-8 -*-

import logging
import queue
import threading

def func_a(a, b):
return a + b

def func_b():
pass

def func_c(a, b, c):
return a, b, c

# 异步任务队列
_task_queue = queue.Queue()

def async_call(function, callback, *args, **kwargs):
_task_queue.put({
'function': function,
'callback': callback,
'args': args,
'kwargs': kwargs
})

def _task_queue_consumer():
"""
异步任务队列消费者
"""
while True:
try:
task = _task_queue.get()
function = task.get('function')
callback = task.get('callback')
args = task.get('args')
kwargs = task.get('kwargs')
try:
if callback:
callback(function(*args, **kwargs))
except Exception as ex:
if callback:
callback(ex)
finally:
_task_queue.task_done()
except Exception as ex:
logging.warning(ex)

def handle_result(result):
print(type(result), result)

if __name__ == '__main__':
t = threading.Thread(target=_task_queue_consumer)
t.daemon = True
t.start()

async_call(func_a, handle_result, 1, 2)
async_call(func_b, handle_result)
async_call(func_c, handle_result, 1, 2, 3)
async_call(func_c, handle_result, 1, 2, 3, 4)

_task_queue.join()