基本模型:
发布者 -> 交换机 <-> 订阅者
代码示例
# -*- coding: utf-8 -*- # 消息发布/订阅模型 from collections import defaultdict from contextlib import contextmanager class Exchange(object): def __init__(self): self._subscribers = set() def attach(self, task): self._subscribers.add(task) def detach(self, task): self._subscribers.remove(task) def send(self, message): for subscriber in self._subscribers: subscriber.send(message) @contextmanager def subscribe(self, *tasks): for task in tasks: self.attach(task) try: yield finally: for task in tasks: self.detach(task) _exchanges = defaultdict(Exchange) def get_exchange(name): return _exchanges[name] class Task(object): def send(self, message): """发送消息的方法""" print(message) task1 = Task() task2 = Task() # 1、手动 添加注册,取消注册 exchage = get_exchange("message") exchage.attach(task1) exchage.attach(task2) exchage = get_exchange("message") exchage.send("你好") # 你好 # 你好 exchage.detach(task1) exchage.detach(task2) # 2、使用上下文管理器 exchage = get_exchange("message") with exchage.subscribe(task1, task2): exchage.send("你好啊") # 你好啊 # 你好啊