Redis Expiration Notice

First, the key space notice Keyspace Notifications

 1. redis only supported version after 2.8.0

2. Based on the pub-sub

3. Message Type: keysapce / keyevent

 

Two, Scene

1. redis cache generally set the expiration time, otherwise they will be more and more, but if there is a cache can be used to reload the cache expiration reminder

Need to do some processing logic 2. expired

 

Three, redis profile

Modify redis.conf, set notify-keyspace-events Ex, defaults to notify-keyspace-events "", the revised restart redis

 

Fourth, the monitor command

psubscribe __keyevent @ 0 __: expired // listening 0th database

psubscribe __keyevent @ * __: expired // monitor all database

 

Fifth, the key code

1. Write a class that inherits JedisPubSub

class RedisMsgPubSubListener extends JedisPubSub

2. The client monitor

RedisMsgPubSubListener listener = new RedisMsgPubSubListener();  
jedis.subscribe(listener, "__keyevent@0__:expired"); //subscribe是阻塞方法

 

 

 

reference:

https://blog.csdn.net/weixin_41497481/article/details/85322794

https://blog.csdn.net/zhu_tianwei/article/details/80169900

https://www.cnblogs.com/ruiati/p/6655949.html