return importModel;
    }

    private static <T> T cache(
            ModelCache cache, String groupId, String artifactId, String version, String tag, Callable<T> supplier) {
        Supplier<T> s = asSupplier(supplier);
        if (cache == null) {
            return s.get();
        } else {
            return cache.computeIfAbsent(groupId, artifactId, version, tag, s);
        }
    }