Spring ReactiveCacheKeyGenerator - @Cacheable Doesn't Support Reactive Type

In springboot-webflux:3.2.0. is there any support for reactive caching in cacahe lib for example:

import org.springframework.cache.interceptor.ReactiveCacheKeyGenerator; import org.springframework.security.core.context.ReactiveSecurityContextHolder; import org.springframework.stereotype.Component; import reactor.core.publisher.Mono;

import java.lang.reflect.Method;

@Component("customReactiveKeyGenerator") public class CustomReactiveKeyGenerator implements ReactiveCacheKeyGenerator {

@Override
public Mono<Object> generate(String cacheName, Object target, Method method, Object... params) {
    return ReactiveSecurityContextHolder.getContext()
            .map(securityContext -> {
                // Extract relevant information, such as the username
                String username = securityContext.getAuthentication().getName();

                // Create a key based on the method name and username
                StringBuilder key = new StringBuilder();
                key.append(method.getName());
                key.append(":").append(username);

                // You can also include additional parameters in the key
                for (Object param : params) {
                    if (param instanceof String) {
                        key.append(":").append(param);
                    }
                }

                return key.toString();
            });
}

}

Comment From: jhoeller

This is a duplicate of #31973 which we recently declined since it is currently not supported by design: https://github.com/spring-projects/spring-framework/issues/31973#issuecomment-1880722965

If we can find an arrangement where we are able to support a Mono type coming out of a custom KeyGenerator and make it part of the reactive pipeline despite the limitations of the underlying cache contract (which focuses on asynchronous retrieval of values for pre-determined keys), let's open #31973 accordingly.