@FunctionalInterface
interface AsyncLoader<T> {
    
    static <T> AsyncLoaderBuilder<T> builder(Supplier<CompletableFuture<T>> loader) {
        return new AsyncLoaderBuilder<T>(loader);
    }
    
    CompletableFuture<T> get();
}

class AsyncLoaderBuilder<T> {

    AsyncLoaderBuilder<T> expireAfterLoad(Duration duration) {
        ...
    }

    AsyncLoaderBuilder<T> expireIf(Predicate<T> predicate) {
        ...
    }

}