Applying Cache to the Intangible Goods Service

As multiple servers were configured to distribute traffic for the intangible goods service, it was decided to introduce a Global Cache to resolve data synchronization issues between servers and enable efficient data sharing.

For this, Amazon ElastiCache, AWS's fully managed in-memory cache service, was chosen, and the Redis engine is utilized for its diverse data structures and transaction support.

The implementation applies cache abstraction using Spring Boot's @Cacheable annotation, and the specific implementation approach is as follows.

• The Look-aside (Cache-aside) strategy is used to first check whether the cache exists, and only query the DB and store it in the cache when there is no data.
• The spring-boot-starter-data-redis dependency is added, and the TTL (expiration time), key prefix, serialization method, etc. are customized and configured via RedisCacheManager.