Question

我正在寻找一种通过弹簧注释设置TTL的方法。

我尝试了

@CacheEvict(allEntries = true, value = { "mycache" })
@Scheduled(fixedDelay = 5000)

然后将@EnableScheduling放到我的Application.java上就没有成功。

我还在类上使用@RedisHash(timeToLive=2000)的方法上尝试过@TimeToLive(unit = TimeUnit.SECONDS)。

然后我尝试将@EnableRedisRepositories(keyspaceConfiguration = UserKeySpaceConfiguration.class)放在课堂上

public class UserKeySpaceConfiguration extends KeyspaceConfiguration {

  /**
   * {@inheritDoc}
   *
   * @see org.springframework.data.redis.core.convert.KeyspaceConfiguration#getKeyspaceSettings(java.lang.Class)
   */
  @Override
  public KeyspaceSettings getKeyspaceSettings(final Class<?> type) {
    final KeyspaceSettings keyspaceSettings = new KeyspaceSettings(type, "user-keyspace");
    keyspaceSettings.setTimeToLive(172800L);
    return keyspaceSettings;
  }

  /**
   * {@inheritDoc}
   * @see org.springframework.data.redis.core.convert.KeyspaceConfiguration#hasSettingsFor(java.lang.Class)
   */
  @Override
  public boolean hasSettingsFor(final Class<?> type) {
    return true;
  }

}

所有此方法均无效。当我检查Redis的密钥是否具有TTL时，我总是具有-1。

关于如何进行的任何想法？

谢谢。

Answer 1

经过一周的搜索，我找到了解决方法。

要在不同的键上使用不同的TTL，必须创建自己的缓存管理器。

因此，在您的Application.java中添加自定义缓存管理器。

@SpringBootApplication
@EnableSwagger2
@EnableCaching
public class Application extends SpringBootServletInitializer {

  public static void main(final String[] args) throws Exception {
    SpringApplication.run(Application.class, args);
  }

  @Primary
  @Bean
  public RedisCacheManager cacheManager(final RedisConnectionFactory connectionFactory) {
    final RedisCacheWriter redisCacheWriter = RedisCacheWriter.lockingRedisCacheWriter(connectionFactory);
    final SerializationPair<Object> valueSerializationPair = RedisSerializationContext.SerializationPair.fromSerializer(new GenericJackson2JsonRedisSerializer());
    final RedisCacheConfiguration cacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();
    final RedisCacheManager redisCacheManager = new RedisCacheManager(redisCacheWriter, cacheConfiguration);
    return redisCacheManager;
  }

  @Bean(name = "pickleCacheManager")
  public RedisCacheManager pickleCacheManager(final RedisConnectionFactory connectionFactory) {
    final RedisCacheWriter redisCacheWriter = RedisCacheWriter.lockingRedisCacheWriter(connectionFactory);
    final SerializationPair<Object> valueSerializationPair = RedisSerializationContext.SerializationPair.fromSerializer(new GenericJackson2JsonRedisSerializer());
    RedisCacheConfiguration cacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();
    cacheConfiguration = cacheConfiguration.entryTtl(Duration.ofSeconds(120));
    final RedisCacheManager redisCacheManager = new RedisCacheManager(redisCacheWriter, cacheConfiguration);
    return redisCacheManager;
  }

  @Bean(name = "userCacheManager")
  public RedisCacheManager userCacheManager(final RedisConnectionFactory connectionFactory) {
    final RedisCacheWriter redisCacheWriter = RedisCacheWriter.lockingRedisCacheWriter(connectionFactory);
    final SerializationPair<Object> valueSerializationPair = RedisSerializationContext.SerializationPair.fromSerializer(new GenericJackson2JsonRedisSerializer());
    RedisCacheConfiguration cacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();
    cacheConfiguration = cacheConfiguration.entryTtl(Duration.ofSeconds(172800));
    final RedisCacheManager redisCacheManager = new RedisCacheManager(redisCacheWriter, cacheConfiguration);
    return redisCacheManager;
  }

}

要在缓存之间有所作为，请使用属性name和注释@Bean。

您需要拥有@Primary @Bean，否则您的应用程序将崩溃。在我的情况下，我的主要人员将不做任何更改就返回缓存。

因此在此自定义缓存中，我只需添加

的TTL

cacheConfiguration = cacheConfiguration.entryTtl(Duration.ofSeconds(120));

当您在某个方法上使用缓存时，只需像这样指定缓存：

@Cacheable(value = "value", key = "#key", cacheManager = "yourCacheName")

就我而言

@Cacheable(value = "pickle", key = "#pickleId", cacheManager = "pickleCacheManager")
Pickle findFirstById(String pickleId);

您在cacheManager中的@Cacheable是您在name中的@Bean。

Answer 2

您需要更新

@CacheEvict(allEntries = true, value = { "mycache" })

到

@CacheEvict(allEntries = true, cacheNames = { "mycache" })

它可以在StackOverflow上参考此答案。

Java Spring Redis：设置使用注释的时间

2 个答案: