Spring Cache

Spring Provide Uniformed Cache Abstraction

• Add cache support for Java method to cache the execute result
• Support ConcurrentMap, EhCache, Caffeine, JCache(JSR-107
• Interfaces
• org.springframework.cache.Cache
• org.springframework.cache.CacheManager

Cache Annotations

@EnableCaching(procyTargetClass=true)

• @Cacheable
• @CacheEvict
• @CachePut
• @Caching
• @CacheConfig

Use Redis as Cache

Configurations,

• spring.cache.type = redis
• spring.cache.cahe-names = coffee
• spring.cache.redis.time-tolive = 5000
• spring.cache.redis.cache-null-values = false
• spring.redis.host = localhost

Connection with Redis

The new spring data Redis uses LettuceConnectionFactory to replace JedisConnectionFactory.

• RedisStandaloneConfiguration
• RedisSentinelConfiguration
• RedisClusterConfiguration

Read-Write Separation

Lettuce supports read-write separation.

• Read-only primary server, read-only secondary server
• Read primary server first, read secondary server first

LettuceClientConfiguration

LettucePoolingClientConfiguration

LettuceClientConfigurationBuilderCustomizer

RedisTemplate

RedisTemplate

• opsForXxx()

StringRedisTemplate

Don't forget to set expire time

RedisRepository

Annotations

• @RedisHash
• @Id
• @Indexed
• @EnableRedisRepository

Example

• Properties

  Properties

  spring.redis.host=localhost
  spring.redis.lettuce.pool.maxActive=5
  spring.redis.lettuce.pool.maxIdle=5
  

• Repository

  Java

  public interface CoffeeCacheRepository extends CrudRepository<CoffeeCache, Long> {
      Optional<CoffeeCache> findOneByName(String name);
  }
  

• Cache Entity

  Java

  import lombok.AllArgsConstructor;
  import lombok.Builder;
  import lombok.Data;
  import lombok.NoArgsConstructor;
  import org.joda.money.Money;
  import org.springframework.data.annotation.Id;
  import org.springframework.data.redis.core.RedisHash;
  import org.springframework.data.redis.core.index.Indexed;
  
  @RedisHash(value = "springbucks-coffee", timeToLive = 60)
  @Data
  @NoArgsConstructor
  @AllArgsConstructor
  @Builder
  public class CoffeeCache {
      @Id
      private Long id;
      @Indexed
      private String name;
      private Money price;
  }
  

• RedisCustomConverions

Handle Different Data Source Repository

How to distinguish these repositories?

• Based on entity annotation
• Based on the inherited interface type
• Scan different package