Spring boot + redis converts expired events into application events
This article introduces the knowledge of "spring boot + redis to convert expired events into application events". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!
Modify redis.conf
# K key space notification, prefixed with _ _ keyspace@__ # E key event notification Notification of general commands that are prefixed with _ _ keysevent@__ # g del, expipre, rename, etc. # $String command # l List command # s Set command # h Hash command # z ordered collection command # x expiration event (generated each time key expires) # e alias for eviction event (generated when key is full when memory is cleared) # A g$lshzxe, so "AKE" means all events
Notify-keyspace-events Ex
two。 Add RedisMessageListenerContainer configuration
@ Beanpublic RedisMessageListenerContainer container (RedisConnectionFactory connectionFactory) {RedisMessageListenerContainer container = new RedisMessageListenerContainer (); container.setConnectionFactory (connectionFactory); return container;}
3. Add KeyExpirationEventMessageListener configuration
@ Beanpublic KeyExpirationEventMessageListener keyExpirationEventMessageListener (RedisMessageListenerContainer container) {return new KeyExpirationEventMessageListener (container);}
KeyExpirationEventMessageListener will automatically subscribe to the Topic of _ _ keyevent@*__:expired.
4. Add an event listener
@ Component@Slf4jpublic class RedisKeyExpireListener implements ApplicationListener {@ Override public void onApplicationEvent (RedisKeyExpiredEvent event) {log.debug ("{}: {}", event.getId (), event.getKeyspace (), event.getValue (), event.getChannel ());}
It is very convenient to use spring to listen for expired events. You only need a few simple Bean configurations. Spring will convert redis expired events into spring application events. We only need to have a listener to listen for RedisKeyExpiredEvent events.
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