Redis发布订阅

1、什么是Redis发布订阅

　　进程间的一种消息通信模式：发送者（Pub）发布信息，订阅者（Sub）接受信息。

2、案例　　

案例1：一次订阅多个  SUBSCRIBE c1 c2 c3

消息发布  c2 hello-c2

127.0.0.1:6379> SUBSCRIBE c1 c2 c3
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "c1"
3) (integer) 1
1) "subscribe"
2) "c2"
3) (integer) 2
1) "subscribe"
2) "c3"
3) (integer) 3
1) "message"
2) "c2"
3) "hello-c2"
1) "message"
2) "c1"
3) "hello-c1"

127.0.0.1:6379> PUBLISH c2 hello-c2
(integer) 1
127.0.0.1:6379> PUBLISH c1 hello-c1
(integer) 1

案例2：订阅多个，通配符* 形式订阅多个   。PSUBSCRIBE new*

发布信息 PUBLISH new1 redis2019

127.0.0.1:6379> PSUBSCRIBE new*
Reading messages... (press Ctrl-C to quit)
1) "psubscribe"
2) "new*"
3) (integer) 1
1) "pmessage"
2) "new*"
3) "new1"
4) "redis2019"
1) "pmessage"
2) "new*"
3) "new31"
4) "redis2019"

127.0.0.1:6379> PUBLISH new1 redis2019
(integer) 1
127.0.0.1:6379> PUBLISH new31 redis2019
(integer) 1