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武林网网站的支持!
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