@Override protected void getRootAsync(FutureWithCallback<Object> future) { long rootId = _jdbm.getRoot(ROOT); byte[] data = null; if (rootId == 0) future.set(null); else { data = _jdbm.fetch(rootId); if (data == null) throw new RuntimeIOException(Strings.CORRUPTED_STORE); Object root = _reader.read(data); _reader.readVersions(); _reader.importVersions(); future.set(root); } }