Caffeine async cache wih Spring Boot CacheManager

Question

I am trying to use Spring Boot CacheManager with Caffeine and some @Cacheable annotated functions. In our tests, asynchronous calls to our controllers endpoints are having issues that seem to be related to the fact that we were using a non-asynchronous cache.

While doing some research, I have seen a lot of examples of using Caffeine manually with CompletableFuture, but could not found nothing with AsyncCacheLoader and Spring Boot CacheManager and @Cacheable annotation. It looks like Cache and AsyncCache have very distinct APIs. Is this possible to use the default Spring Boot CacheManager asynchronously?

Thanks!

Answer 1

Updating the answer after comment by Ben Manes. You can use @Cacheable with Spring Boot Cache Manager for reactive Spring Webflux but underneath the hoods values are stored in synchronous cache. Here is an example

@RestController
@SpringBootApplication
@EnableCaching
public class GatewayApplication {

 @PostMapping(value ="/test", produces = "application/json")
 public Flux<String> handleRequest(@RequestBody String body) {
    return getData(body);
 }

 @Cacheable("cache")
 private Flux<String> getData(String body) {
    return WebClient.create().post()
            .uri("http://myurl")
            .body(BodyInserters.fromObject(body))
            .retrieve().bodyToFlux(String.class).cache();
 }
}

As you can see in above example, its using Spring Webflux(Project reactor) and @Cacheable method returns Flux which is async.

You can use AsyncCache directly if you want reactive cache as it stores CompleteableFutures