Posts Tagged - caching

Spring Cache

Spring Cache

A cache itself may be imagined as a key-value map. For a basic Cache we need:

  • @EnableCaching tag in @Configuration class
  • Declare a CacheManager Bean
  • Tag the method to cache w. @Cacheable
  • Create a method with @CacheEvict

We may declare +1 cache(s) at the cache manager and select the one we want to use in the method we tag. As key for the cache we may use any conjunction of the parameters given to the method, or if this is a class, any of it’s accessible variables. The cache will only be triggered when the exact key is given again. Then the method won’t be executed and the value will be directly given from the cache. If the parameters don’t match any key, the method will be executed as normal and then the value will be saved into the cache to be returned the next time.

Caution with logs in big apps as they need to be written accordingly.
The hard part is not knowing when to cache something, but to know when to Evict the cache.

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