spring-cache-demo

Small Spring Boot demo app demonstrating how to use Spring Cache when integrating with slow external services.

High level architecture

1. There are two slow services, 1. SlowExternalUserService and 2. SuperSlowExternalService
2. ScheduledCacheTask is responsible for initiating the Users cache at startup and refreshing the cache every 120 seconds (by using @Scheduled(fixedDelay)). This is done by calling the slow services and response is rewritten in the Users cache (by using @CachePut)
3. UserResource (REST API) is retrieving the data from UserService, which reads cached data by using the CacheManager
4. It takes about 10 seconds after startup before data from SlowExternalUserService is available and 20 seconds from SuperSlowExternalService

Getting started

$ ./mvnw spring-boot:run

REST APIs

• GET http://localhost:8080/users/{systemName}/{appName}/{env} - return users from Users cache
  • systemName=system1, system2
  • appName=app11, app12, app13, app21
  • env=PROD, TEST
• GET http://localhost:8080/cache/refresh/{systemName}/{appName}/{env} - triggers refresh of Users cache
  • systemName=system1, system2
  • appName=app11, app12, app13, app21
  • env=PROD, TEST