Redis

【Redis】Pub/Sub

Posted by 西维蜀黍 on 2022-01-02, Last Modified on 2024-02-26

Publish/Subscribe Pattern

Refer to https://swsmile.info/post/publish-subscribe-pattern/

Pub/sub in Redis

SUBSCRIBE, UNSUBSCRIBE and PUBLISH implement the Publish/Subscribe messaging paradigm where (citing Wikipedia) senders (publishers) are not programmed to send their messages to specific receivers (subscribers). Rather, published messages are characterized into channels, without knowledge of what (if any) subscribers there may be. Subscribers express interest in one or more channels, and only receive messages that are of interest, without knowledge of what (if any) publishers there are. This decoupling of publishers and subscribers can allow for greater scalability and a more dynamic network topology.

Demo

Publisher

redis-cli -h 192.168.18.129
192.168.18.129:6379> ping
PONG
192.168.18.129:6379> PUBLISH channel1 111
(integer) 2
192.168.18.129:6379> PUBLISH channel1 222
(integer) 2
192.168.18.129:6379>

Subscriber 1

redis-cli -h 192.168.18.129
192.168.18.129:6379> SUBSCRIBE channel1
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "channel1"
3) (integer) 1
1) "message"
2) "channel1"
3) "111"

1) "message"
2) "channel1"
3) "222"

Subscriber 2

redis-cli -h 192.168.18.129
192.168.18.129:6379> SUBSCRIBE channel1
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "channel1"
3) (integer) 1
1) "message"
2) "channel1"
3) "111"

1) "message"
2) "channel1"
3) "222"

Reference

FEATURED TAGS
algorithm algorithmproblem architecturalpattern architecture aws c# cachesystem codis concurrentcontrol database dataformat datastructure debug design designpattern distributedsystem django docker domain engineering freebsd git golang grafana hackintosh hadoop hardware hexo http hugo ios iot java javaee javascript kafka kubernetes linux linuxcommand linuxio lock macos markdown microservices mysql nas network networkprogramming nginx node.js npm oop openwrt operatingsystem padavan performance programming prometheus protobuf python redis router security shell software-testing spring sql systemdesign truenas ubuntu vmware vpn windows wmware wordpress zookeeper
FRIENDS

TOC