/**
         * Called when a resource is to be cached. Should *move* the given file into the appropriate location and return a handle to the file.
         */
        LocallyAvailableResource moveIntoCache(File downloadedResource);
    }

    abstract class DefaultResourceFileStore<K> implements ResourceFileStore {

        private final FileStore<K> delegate;

        }

        // Move into cache
        try {
            return moveIntoCache(source, downloadAction.getDestination(), fileStore, downloadAction.getMetaData());
        } finally {
            downloadAction.getDestination().delete();
        }
    }

        1 * remoteResource.withContentIfPresent(_) >> { ExternalResource.ContentAndMetadataAction a ->
            a.execute(new ByteArrayInputStream(), metaData)
        }

        and:
        1 * fileStore.moveIntoCache(tempFile) >> localResource
        1 * index.store("thing", cachedFile, metaData)
        1 * fileRepository.resource(cachedFile, location.uri, metaData) >> cachedResource
        0 * _._
    }