val downloadAction = DownloadAction(externalResourceName, temporaryFileProvider, null)
                externalResource.withContentIfPresent(downloadAction)

                lockingAccessCoordinator.useCache {
                    val cachedResource = externalResourceFileStore.move(externalResource.toString(), downloadAction.destination)

                try {
                    ExternalResourceName query = toQuery(baseUri, fingerprint);
                    ExternalResourceReadResult<ExponentialBackoff.Result<Boolean>> response = client.resource(query).withContentIfPresent(inputStream -> {
                        extractKeyRing(inputStream, builder, onKeyring);
                        return ExponentialBackoff.Result.successful(true);
                    });

            @Override
            @Nullable
            public ExternalResourceReadResult<Metadata> call() {
                return repository.resource(metadataResource).withContentIfPresent(inputStream -> {
                    try {
                        return new MetadataXpp3Reader().read(inputStream, false);
                    } catch (Exception e) {