Architecting Modern Java EE Applications

Caching

Caching is a technically motivated cross-cutting concern that becomes interesting once applications face issues in performance, such as slow external systems, expensive and cachable calculations, or huge amount of data. In general, caching aims to lower response times by storing data that is costly to retrieve in a potentially faster cache. A typical example is to hold responses of external systems or databases in memory.

Before implementing caching, a question that needs to be asked is whether a cache is required or even possible. Some data doesn't qualify for being cached, such as data that needs to be calculated on demand. If the situation and data is potentially eligible for caching, it depends on the situation if another solution ...