SpringBoot监听Redis的Key过期事件

原文链接:https://javaweb.io/post/198

Redis的配置

  • 修改conf文件
  • notify-keyspace-events "Ex"
  • 该配置表示监听key的过期事件,默认未开启
  • 该配置的其他信息(可以监听N多事件),可以参阅配置文件的注释,非常详细

自定义监听器

该监听器会在key过期时候触发

 

import java.nio.charset.StandardCharsets;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.listener.KeyExpirationEventMessageListener;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
public class KeyExpiredListener extends KeyExpirationEventMessageListener {
    private static final Logger LOGGER = LoggerFactory.getLogger(KeyExpiredListener.class);
    public KeyExpiredListener(RedisMessageListenerContainer listenerContainer) {
        super(listenerContainer);
    }
    @Override
    public void onMessage(Message message, byte[] pattern) {
        String channel = new String(message.getChannel(),StandardCharsets.UTF_8);
        //过期的key
        String key = new String(message.getBody(),StandardCharsets.UTF_8);
        LOGGER.info("redis key 过期:pattern={},channel={},key={}",new String(pattern),channel,key);
    }
}

 @Confiugration配置

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import io.javaweb.redis.listener.KeyExpiredListener;
@Configuration
public class RedisConfiguration {
    @Autowired 
    private RedisConnectionFactory redisConnectionFactory;
    @Bean
    public RedisMessageListenerContainer redisMessageListenerContainer() {
        RedisMessageListenerContainer redisMessageListenerContainer = new RedisMessageListenerContainer();
        redisMessageListenerContainer.setConnectionFactory(redisConnectionFactory);
        return redisMessageListenerContainer;
    }
    @Bean
    public KeyExpiredListener keyExpiredListener() {
        return new KeyExpiredListener(this.redisMessageListenerContainer());
    }
}

 

往Redis写入一个key,并且设置过期时间

SpringBoot监听Redis的Key过期事件_第1张图片

过期事件被触发

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