Python多线程异步任务队列（实例）-爱站

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。

python的多线程异步常用到queue和threading模块

#!/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()