Python-Redis-发布订阅
参考博客:http://www.runoob.com/redis/redis-pub-sub.html
一、前言
Redis 发布订阅(pub/sub)是一种消息通信模式:发送者(pub)发送消息,订阅者(sub)接收消息。
Redis 客户端可以订阅任意数量的频道。
下图展示了频道 channel1 , 以及订阅这个频道的三个客户端 —— client2 、 client5 和 client1 之间的关系:
当有新消息通过 PUBLISH 命令发送给频道 channel1 时, 这个消息就会被发送给订阅它的三个客户端:
二、事例
Demo:
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import redis class RedisHelper: def __init__( self ): self .__conn = redis.Redis(host = '172.16.200.49' ) self .chan_sub = 'fm104.5' self .chan_pub = 'fm104.5' def public( self , msg): self .__conn.publish( self .chan_pub, msg) return True def subscribe( self ): pub = self .__conn.pubsub() pub.subscribe( self .chan_sub) pub.parse_response() return pub |
订阅者:
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# -*- coding: UTF-8 -*- from redis_helper import RedisHelper obj = RedisHelper() redis_sub = obj.subscribe() while True : msg = redis_sub.parse_response() print (msg) |
发布者:
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# -*- coding: UTF-8 -*- from redis_helper import RedisHelper obj = RedisHelper() while True : msg = input ( '>>:' ) obj.public(msg) |