一个简单的消息队列

目录

原理

实现代码

示例

原理

消息队列是一个先进先出栈，每次都处理第一项，处理完了过后会删除这个消息，这是一个简单的消息队列图：

实现代码

首先消息队列需要一个队列，我们用Python里的列表：

self.queue = []

接着我们要实现把一个消息加入队列和处理消息：

def push(self, text):
    self.queue.append(text)

def pull(self):
    test = self.queue[0]
    self.queue.pop()
    return test

示例

然后我们来验证一下：

import time

'''
消息队列的类
'''

mq = MessageQueue()
for i in range(1, 21):
    mq.push(f"[Error {i}] author is not find")
    print(mq.pull(), end="")
    time.sleep(0.1)
    print(".", end="")
    time.sleep(0.1)
    print(".", end="")
    time.sleep(0.1)
    print(".")

结果：

[Error 1] author is not find…
[Error 2] author is not find…
[Error 3] author is not find…
[Error 4] author is not find…
[Error 5] author is not find…
[Error 6] author is not find…
[Error 7] author is not find…
[Error 8] author is not find…
[Error 9] author is not find…
[Error 10] author is not find…
[Error 11] author is not find…
[Error 12] author is not find…
[Error 13] author is not find…
[Error 14] author is not find…
[Error 15] author is not find…
[Error 16] author is not find…
[Error 17] author is not find…
[Error 18] author is not find…
[Error 19] author is not find…
[Error 20] author is not find…

Process finished with exit code 0

列表：

[] 

完整代码

import time

class MessageQueue(object):
    def __init__(self):
        self.queue = []

    def push(self, text):
        self.queue.append(text)

    def pull(self):
        test = self.queue[0]
        self.queue.pop()
        return test

mq = MessageQueue()
for i in range(1, 21):
    mq.push(f"[Error {i}] author is not find")
    print(mq.pull(), end="")
    time.sleep(0.1)
    print(".", end="")
    time.sleep(0.1)
    print(".", end="")
    time.sleep(0.1)
    print(".")