Reactive couchbase springboot cache

[khazzz]

With this PR, one is able to cache a value of a Mono. Please see below a sample service that is caching a value of a Mono via Cacheable annotation:

@service
public class AemFacade {

private static final Logger LOGGER = LoggerFactory.getLogger(AemFacade.class);

private final WebClient webClient;

@Value("${environment.aemUrl}")
private String aemUrl;

@Autowired

public AemFacade(WebClient webClient) {
this.webClient = webClient;
}

@Cacheable(cacheNames = "media", key = "{ #request.id, #request.mediaType }")
public Mono<AemResponse> getMedia(AemRequest request) {
    
    LOGGER.debug("executing AemFacade.getMedias({},{}}", request.getId(), request.getMediaType());
    
    String url = aemUrl + buildResourceUri(request);
    
    return webClient

.get()
.uri(url)
.retrieve()
.bodyToMono(AemResponse.class)
.doOnError(this::handleThrowable)
.map(response -> failIfResponseHasErrors(request, response));
}
}