编程思想设计模式行为模式BehavioralPublish_Subscribe
Posted 炼狱腾蛇
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Python版
https://github.com/faif/python-patterns/blob/master/behavioral/publish_subscribe.py
#!/usr/bin/env python # -*- coding: utf-8 -*- """ Reference: http://www.slideshare.net/ishraqabd/publish-subscribe-model-overview-13368808 Author: https://github.com/HanWenfang """ class Provider: def __init__(self): self.msg_queue = [] self.subscribers = {} def notify(self, msg): self.msg_queue.append(msg) def subscribe(self, msg, subscriber): self.subscribers.setdefault(msg, []).append(subscriber) def unsubscribe(self, msg, subscriber): self.subscribers[msg].remove(subscriber) def update(self): for msg in self.msg_queue: for sub in self.subscribers.get(msg, []): sub.run(msg) self.msg_queue = [] class Publisher: def __init__(self, msg_center): self.provider = msg_center def publish(self, msg): self.provider.notify(msg) class Subscriber: def __init__(self, name, msg_center): self.name = name self.provider = msg_center def subscribe(self, msg): self.provider.subscribe(msg, self) def unsubscribe(self, msg): self.provider.unsubscribe(msg, self) def run(self, msg): print("{} got {}".format(self.name, msg)) def main(): message_center = Provider() fftv = Publisher(message_center) jim = Subscriber("jim", message_center) jim.subscribe("cartoon") jack = Subscriber("jack", message_center) jack.subscribe("music") gee = Subscriber("gee", message_center) gee.subscribe("movie") vani = Subscriber("vani", message_center) vani.subscribe("movie") vani.unsubscribe("movie") fftv.publish("cartoon") fftv.publish("music") fftv.publish("ads") fftv.publish("movie") fftv.publish("cartoon") fftv.publish("cartoon") fftv.publish("movie") fftv.publish("blank") message_center.update() if __name__ == "__main__": main() ### OUTPUT ### # jim got cartoon # jack got music # gee got movie # jim got cartoon # jim got cartoon # gee got movie
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