1.修改redis配置类开启过期事件
windows修改redis.windows.conf,nginx修改redis.conf
配置文件中notify-keyspace-events的值
默认配置notify-keyspace-events的值为" ",修改为 notify-keyspace-events Ex 这样便开启了过期事件
2.添加Redis配置类
@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport
{
@Bean
@SuppressWarnings(value = { "unchecked", "rawtypes" })
public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory)
{
RedisTemplate<Object, Object> template = new RedisTemplate<>();
template.setConnectionFactory(connectionFactory);
FastJson2JsonRedisSerializer serializer = new FastJson2JsonRedisSerializer(Object.class);
ObjectMapper mapper = new ObjectMapper();
mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
mapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
serializer.setObjectMapper(mapper);
// 使用StringRedisSerializer来序列化和反序列化redis的key值
template.setKeySerializer(new StringRedisSerializer());
template.setValueSerializer(serializer);
// Hash的key也采用StringRedisSerializer的序列化方式
template.setHashKeySerializer(new StringRedisSerializer());
template.setHashValueSerializer(serializer);
template.afterPropertiesSet();
return template;
}
@Bean
public DefaultRedisScript<Long> limitScript()
{
DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>();
redisScript.setScriptText(limitScriptText());
redisScript.setResultType(Long.class);
return redisScript;
}
@Bean
RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory) {
RedisMessageListenerContainer container = new RedisMessageListenerContainer();
container.setConnectionFactory(connectionFactory);
return container;
}
/**
* 限流脚本
*/
private String limitScriptText()
{
return "local key = KEYS[1]\n" +
"local count = tonumber(ARGV[1])\n" +
"local time = tonumber(ARGV[2])\n" +
"local current = redis.call('get', key);\n" +
"if current and tonumber(current) > count then\n" +
" return tonumber(current);\n" +
"end\n" +
"current = redis.call('incr', key)\n" +
"if tonumber(current) == 1 then\n" +
" redis.call('expire', key, time)\n" +
"end\n" +
"return tonumber(current);";
}
}
3.失效后的回调
@Component
public class RedisKeyExpirationListener extends KeyExpirationEventMessageListener {
public RedisKeyExpirationListener(RedisMessageListenerContainer container) {
super(container);
}
/**
* 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) {
String key=message.toString();//生效的key
if (key!=null && key.startsWith("aaa")){//可根据key筛选
System.out.println("失效:"+key+" 逻辑处理");
}
}
}
4.测试
分类:
redis
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