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！
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redis.host1: 10.113.56.68
redis.port1: 7030
redis.host2: 10.113.56.68
redis.port2: 7031
redis.host3: 10.113.56.68
redis.port3: 7032
redis.host4: 10.113.56.68
redis.port4: 7033
redis.host5: 10.113.56.68
redis.port5: 7034
redis.host6: 10.113.56.68
redis.port6: 7035
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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
**/
@Configuration
public 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());
}
}
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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();
}
}
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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。
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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
**/
@Component
public 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();
}
}
}
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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服务器之家网站的支持！
如果你觉得本文对你有帮助，欢迎转载，烦请注明出处，谢谢！
原文链接：https://www.cnblogs.com/xiaobingblog/archive/2019/09/09/11490726.html