Is caffeine supported in reactive programming

[omikhare]

Hi Ben,

I am looking for caffeine use in spring web flux which support only non blocking APIs. Does caffeine provides either async or reactive template to support spring web flux.

Thank.

[ben-manes]

You can use AsyncCache and convert using Mono.fromFuture and Mono.toFuture. Spring Cache does not have async support (spring-projects/spring-framework#17920), so you should use our apis directly.

[alex-arana]

You can integrate Caffeine caches with Spring WebFlux using reactor-addons utility classes CacheMono and CacheFlux. However, both have been deprecated and have been slated for removal in release 3.6.0.

I recently wrote a replacement (in Kotlin) for both of those helper classes using a couple of different strategies:

• A local caching strategy backed by an instance of AsyncLoadingCache
• A delegated approach which adapts a Spring Cache instance (ie. Redis) to an AsyncCacheLoader so that value loading occurs in a Future object thus addressing potential cache stampeding issues.

I had some existing APIs that needed to retro-fitted so would need to untangle all the relevant bits but happy to share if anyone is interested..