Redis发布及订阅消息(pub/sub)

发布及订阅消息(pub/sub) 类似观察者模式(web聊天系统)
http://hi.baidu.com/576699909/item/70e306093a6441dadde5b09d
http://www.redis.cn/topics/pubsub.html

session1 subscribe tv1 --监听tv1127.0.0.1:6379> subscribe tv1Reading messages... (press Ctrl-C to quit)1) "subscribe"2) "tv1"3) (integer) 1session2subscribe tv1 tv2 --监听tv1 tv2127.0.0.1:6379> subscribe tv1 tv2Reading messages... (press Ctrl-C to quit)1) "subscribe"2) "tv1"3) (integer) 11) "subscribe"2) "tv2"3) (integer) 2session3 publish tv1 d  --通过publish tv1 广播一个信息session1  session2会立刻接收到1) "message"2) "tv1"3) "dingsai"publish tv2 dingsaitv2 --通过publish tv2 广播一个信息