监听redis key过期事件

a.创建一个实现类继承KeyExpirationEventMessageListener

package com.focussend.weixin.utils;

import com.focussend.contacts.service.FissionMarketingService;
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;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;

/**
 * Created by Administrator on 2019/2/26.
 */
@Component
class RedisKeyExpirationListener extends KeyExpirationEventMessageListener {
    public RedisKeyExpirationListener(RedisMessageListenerContainer listenerContainer) {
        super(listenerContainer);
    }
    @Resource
    private FissionMarketingService fissionMarketingService;
    private Logger logger = LoggerFactory.getLogger(RedisKeyExpirationListener.class);

    private final Object fanNumUpdate = new Object();
    /**
     * 针对redis数据失效事件，进行数据处理
     * @param message
     * @param pattern
     */
    @Override
    public void onMessage(Message message, byte[] pattern) {
        // 用户做自己的业务处理即可,注意message.toString()可以获取失效的key
           String expiredKey = message.toString();
                   logger.info("此处根据对应的redis的key去处理业务逻辑");
       }
}

 b. 注入RedisMessageListenerContainer
方法一、使用xml增加的相关配置

            <bean id="redisContainer" class="org.springframework.data.redis.listener.RedisMessageListenerContainer">
                 <property name="connectionFactory" ref="jedisConnectionFactory" />
            </bean>

 方法二、使用config类

/**
 * Redis缓存配置类
 */
@Configuration
public class RedisConfigurer extends CachingConfigurerSupport {
    @Bean
    RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory) {

        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        return container;
    }

}

 

如果服务宕机，那么将接收不到redis推送过来的事件也就无法处理redis过期后的逻辑。我们可以采用redis+定时任务处理，这样可以避免服务宕机，Redis过期事件推送处理的问题，也能够提高系统整体性能。

转自:https://www.jianshu.com/p/c37ad337146f