Redis集群下过期key监听的实现代码

Redis  /  管理员 发布于 7年前   176

1.　前言

在使用redis集群时，发现过期key始终监听不到。网上也没有现成的解决方案。于是想，既然不能监听集群，那我可以建立多个redis连接，分别对每个redis的key过期进行监听。以上做法可能不尽人意，目前也没找到好的解决方案，如果有好的想法，请留言告知哦！不多说，直接贴我自己的代码！

2.　代码实现

关于Redis集群配置代码此处不贴，直接贴配置监听类代码！

redis.host1: 10.113.56.68redis.port1: 7030redis.host2: 10.113.56.68redis.port2: 7031redis.host3: 10.113.56.68redis.port3: 7032redis.host4: 10.113.56.68redis.port4: 7033redis.host5: 10.113.56.68redis.port5: 7034redis.host6: 10.113.56.68redis.port6: 7035

import org.springframework.beans.factory.annotation.Value;import org.springframework.cache.CacheManager;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.data.redis.cache.RedisCacheManager;import org.springframework.data.redis.connection.RedisClusterConfiguration;import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.listener.RedisMessageListenerContainer;import org.springframework.data.redis.serializer.StringRedisSerializer;import redis.clients.jedis.Jedis;import redis.clients.jedis.JedisPoolConfig;import java.util.Arrays;/** * @Author xiabing5 * @Create 2019/8/6 14:46 * @Desc  监听redis中Key过期事件 **/@Configurationpublic class RedisListenerConfig {  @Value("${redis.host1}")  private String host1;  @Value("${redis.host2}")  private String host2;  @Value("${redis.host3}")  private String host3;  @Value("${redis.host4}")  private String host4;  @Value("${redis.host5}")  private String host5;  @Value("${redis.host6}")  private String host6;  @Value("${redis.port1}")  private int port1;  @Value("${redis.port2}")  private int port2;  @Value("${redis.port3}")  private int port3;  @Value("${redis.port4}")  private int port4;  @Value("${redis.port5}")  private int port5;  @Value("${redis.port6}")  private int port6;  @Bean  JedisPoolConfig jedisPoolConfig(){    JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();    jedisPoolConfig.setMaxIdle(100);    jedisPoolConfig.setMaxWaitMillis(1000);    return jedisPoolConfig;  }  // redis-cluster不支持key过期监听，建立多个连接，对每个redis节点进行监听  @Bean  RedisMessageListenerContainer redisContainer1() {    final RedisMessageListenerContainer container = new RedisMessageListenerContainer();    JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory();    jedisConnectionFactory.setHostName(host1);    jedisConnectionFactory.setPort(port1);    jedisConnectionFactory.setPoolConfig(jedisPoolConfig());    jedisConnectionFactory.afterPropertiesSet();    container.setConnectionFactory(jedisConnectionFactory);    return container;  }  @Bean  RedisMessageListenerContainer redisContainer2() {    final RedisMessageListenerContainer container = new RedisMessageListenerContainer();    JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory();    jedisConnectionFactory.setHostName(host2);    jedisConnectionFactory.setPort(port2);    jedisConnectionFactory.setPoolConfig(jedisPoolConfig());    jedisConnectionFactory.afterPropertiesSet();    container.setConnectionFactory(jedisConnectionFactory);    return container;  }  @Bean  RedisMessageListenerContainer redisContainer3() {    final RedisMessageListenerContainer container = new RedisMessageListenerContainer();    JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory();    jedisConnectionFactory.setHostName(host3);    jedisConnectionFactory.setPort(port3);    jedisConnectionFactory.setPoolConfig(jedisPoolConfig());    jedisConnectionFactory.afterPropertiesSet();    container.setConnectionFactory(jedisConnectionFactory);    return container;  }  @Bean  RedisMessageListenerContainer redisContainer4() {    final RedisMessageListenerContainer container = new RedisMessageListenerContainer();    JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory();    jedisConnectionFactory.setHostName(host4);    jedisConnectionFactory.setPort(port4);    jedisConnectionFactory.setPoolConfig(jedisPoolConfig());    jedisConnectionFactory.afterPropertiesSet();    container.setConnectionFactory(jedisConnectionFactory);    return container;  }  @Bean  RedisMessageListenerContainer redisContainer5() {    final RedisMessageListenerContainer container = new RedisMessageListenerContainer();    JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory();    jedisConnectionFactory.setHostName(host5);    jedisConnectionFactory.setPort(port5);    jedisConnectionFactory.setPoolConfig(jedisPoolConfig());    jedisConnectionFactory.afterPropertiesSet();    container.setConnectionFactory(jedisConnectionFactory);    return container;  }  @Bean  RedisMessageListenerContainer redisContainer6() {    final RedisMessageListenerContainer container = new RedisMessageListenerContainer();    JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory();    jedisConnectionFactory.setHostName(host6);    jedisConnectionFactory.setPort(port6);    jedisConnectionFactory.setPoolConfig(jedisPoolConfig());    jedisConnectionFactory.afterPropertiesSet();    container.setConnectionFactory(jedisConnectionFactory);    return container;  }  @Bean  RedisKeyExpirationListener redisKeyExpirationListener1() {    return new RedisKeyExpirationListener(redisContainer1());  }  @Bean  RedisKeyExpirationListener redisKeyExpirationListener2() {    return new RedisKeyExpirationListener(redisContainer2());  }  @Bean  RedisKeyExpirationListener redisKeyExpirationListener3() {    return new RedisKeyExpirationListener(redisContainer3());  }  @Bean  RedisKeyExpirationListener redisKeyExpirationListener4() {    return new RedisKeyExpirationListener(redisContainer4());  }  @Bean  RedisKeyExpirationListener redisKeyExpirationListener5() {    return new RedisKeyExpirationListener(redisContainer5());  }  @Bean  RedisKeyExpirationListener redisKeyExpirationListener6() {    return new RedisKeyExpirationListener(redisContainer6());  }}

import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.redis.connection.Message;import org.springframework.data.redis.listener.KeyExpirationEventMessageListener;import org.springframework.data.redis.listener.RedisMessageListenerContainer;import java.util.Date;/** * @Author xiabing5 * @Create 2019/9/4 9:47 * @Desc  redis过期监听 **/public class RedisKeyExpirationListener extends KeyExpirationEventMessageListener {  @Autowired  RedisUtil redisUtil;  @Autowired  LoginUserStatisticsMapper loginUserStatisticsMapper;  public RedisKeyExpirationListener(RedisMessageListenerContainer listenerContainer) {    super(listenerContainer);  }  @Override  public void onMessage(Message message, byte[] pattern) {    // 用户做自己的业务处理即可,message.toString()可以获取失效的key    String mesg = message.toString();     }}

3.　Redis防止过期key重复监听

对于项目集群情况下，部署多个服务后，容易出现redis过期被多个服务同时监听到，从而执行相同的业务逻辑，这不是我们期望的。单机部署下方法的同步可以采用synchronize关键字。但集群下，就得采用分布式锁。在需要加锁的地方，只要加锁和解锁即可。此处正好写到Redis，那就贴一个自己用的redis分布式锁。

import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import redis.clients.jedis.Jedis;import java.util.Collections;import java.util.UUID;/** * @Author xiabing5 * @Create 2019/9/6 15:54 * @Desc  redis分布式锁 **/@Componentpublic class RedisLock {  @Autowired  Jedis jedis;  private static final String SET_IF_NOT_EXIST = "NX"; // NX表示如果不存在key就设置value  private static final String SET_WITH_EXPIRE_TIME = "PX"; // PX表示毫秒  // 加锁  public String tryLock(String key,Long acquireTimeout) {    // 生成随机value    String identifierValue = UUID.randomUUID().toString();    // 设置超时时间    Long endTime = System.currentTimeMillis() + acquireTimeout;    // 循环获取锁    while (System.currentTimeMillis() < endTime) {      String result = jedis.set(key,identifierValue, SET_IF_NOT_EXIST, SET_WITH_EXPIRE_TIME, acquireTimeout);      if("OK".equals(result)) {        return identifierValue;      }    }    return null;  }  // 解锁//  public void delLock(String key,String identifierValue) {//    // 判断是否是同一把锁//    try{//      if(jedis.get(key).equals(identifierValue)){//        // 此处操作非原子性，容易造成释放非自己的锁//        jedis.del(key);//      }//    }catch(Exception e) {//      e.printStackTrace();//    }//  }  // 使用Lua代码解锁  public void delLock(String key,String identifierValue) {    try{      String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";      Long result = (Long) jedis.eval(script, Collections.singletonList(key), Collections.singletonList(identifierValue));      if (1 == result) {        System.out.println(result+"释放锁成功");      } if (0 == result) {        System.out.println(result+"释放锁失败");      }    }catch (Exception e) {      e.printStackTrace();    }  }}

4.　总结

自己实现的一个小demo,废话比较少。小白自己写的配置类，理解有问题请留言！自己实现的方案感觉不妥，只是基本完成需求，还得继续研究。

以上所述是小编给大家介绍的Redis集群下过期key监听的实现代码,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对站的支持！
如果你觉得本文对你有帮助，欢迎转载，烦请注明出处，谢谢！