private final List<Long> sizes;

        private final List<String> ids;

        private final int hashCode;

        public CacheKey(List<Artifact> extensionArtifacts) {
            this.files = new ArrayList<>(extensionArtifacts.size());
            this.timestamps = new ArrayList<>(extensionArtifacts.size());
            this.sizes = new ArrayList<>(extensionArtifacts.size());