java cache过期_Spring Cache 实现失效时间设置
Spring cache 注解式缓存用起来非常方便，但是却没有ttl 失效时间设置。这就很让人头疼了。
虽然在 @Cacheable 没有ttl注解时间的设置，但是我发现在注解上有cacheManage 的参数设置。
然后查看源码:
public class RedisCacheConfiguration {
private final Duration ttl;
private final boolean cacheNullValues;
private final CacheKeyPrefix keyPrefix;
private final boolean usePrefix;
private final SerializationPair keySerializationPair;
private final SerializationPair valueSerializationPair;
private final ConversionService conversionService;
private RedisCacheConfiguration(Duration ttl, Boolean cacheNullValues, Boolean usePrefix, CacheKeyPrefix keyPrefix, SerializationPair keySerializationPair, SerializationPair> valueSerializationPair, ConversionService conversionService) {
this.ttl = ttl;
this.cacheNullValues = cacheNullValues;
this.usePrefix = usePrefix;
this.keyPrefix = keyPrefix;
this.keySerializationPair = keySerializationPair;
this.valueSerializationPair = valueSerializationPair;
this.conversionService = conversionService;
}
public static RedisCacheConfiguration defaultCacheConfig() {
return defaultCacheConfig((ClassLoader)null);
}
public static RedisCacheConfiguration defaultCacheConfig(@Nullable ClassLoader classLoader) {
DefaultFormattingConversionService conversionService = new DefaultFormattingConversionService();
registerDefaultConverters(conversionService);
return new RedisCacheConfiguration(Duration.ZERO, true, true, CacheKeyPrefix.simple(), SerializationPair.fromSerializer(RedisSerializer.string()), SerializationPair.fromSerializer(RedisSerializer.java(classLoader)), conversionService);
}
public RedisCacheConfiguration entryTtl(Duration ttl) {
Assert.notNull(ttl, "TTL duration must not be null!");
return new RedisCacheConfiguration(ttl, this.cacheNullValues, this.usePrefix, this.keyPrefix, this.keySerializationPair, this.valueSerializationPair, this.conversionService);
}
RedisCacheConfiguration 是支持ttl设置的。但是默认的缓存时间设置是0。所以为什么一定要使用默认的cacheManager呢？
我们可以定义自己的cacheManager，甚至可以多设置几个。根据不同的缓存时间设置不同的cacheManager。
然后代码如下：
@Configuration
@EnableCaching
public class RedisCacheConfig {
@Bean
@Primary
public RedisCacheManager cacheManager(RedisConnectionFactory connectionFactory) {
RedisCacheConfiguration config = instanceConfig(1800L);
return RedisCacheManager.builder(connectionFactory)
.cacheDefaults(config)
.transactionAware()
.build();
}
@Bean
public RedisCacheManager cacheManager15d(RedisConnectionFactory connectionFactory) {
RedisCacheConfiguration config = instanceConfig(3600 * 24 * 15L);
return RedisCacheManager.builder(connectionFactory)
.cacheDefaults(config)
.transactionAware()
.build();
}
private RedisCacheConfiguration instanceConfig(Long ttl) {
Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(Object.class);
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
objectMapper.registerModule(new JavaTimeModule());
// 去掉各种@JsonSerialize注解的解析
objectMapper.configure(MapperFeature.USE_ANNOTATIONS, false);
// 只针对非空的值进行序列化
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
// 将类型序列化到属性json字符串中
objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
jackson2JsonRedisSerializer.setObjectMapper(objectMapper);
return RedisCacheConfiguration.defaultCacheConfig()
.entryTtl(Duration.ofSeconds(ttl))
.disableCachingNullValues()
.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer));
}
}
使用方式：
@Cacheable(value = "article", key = "#id", condition = "#id != null", cacheManager = "cacheManager15d")
默认的cacheManager的过期时间是永不过期。所以覆盖掉就行了。一个不够用，然后就再多配置几个。简单，粗暴，有效...