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

    private static <T> T cache(ModelCache cache, Source source, String tag, Callable<T> supplier) {

        private final String tag;

        private final int hash;

        GavCacheKey(String groupId, String artifactId, String version, String tag) {
            this(gav(groupId, artifactId, version), tag);
        }

        GavCacheKey(String gav, String tag) {
            this.gav = gav;
            this.tag = tag;
            this.hash = Objects.hash(gav, tag);
        }

                    .map(Object::toString)
                    .filter(s -> s.startsWith("SourceCacheKey"))
                    .map(s -> s.substring("SourceCacheKey[location=".length(), s.indexOf(", tag")))
                    .sorted()
                    .distinct()
                    .toList();
            logger.debug("ModelCache contains " + paths.size());
            paths.forEach(s -> logger.debug("    " + s));