/*MUST be called under the WriteLock*/
@NotNull
private Map<Integer, SerializedStubTree> readOldData(final int key) throws StorageException {
final Map<Integer, SerializedStubTree> result = new HashMap<Integer, SerializedStubTree>();
IndexStorage<Integer, SerializedStubTree> indexStorage = myStorage;
if (indexStorage instanceof MemoryIndexStorage) {
final MemoryIndexStorage<Integer, SerializedStubTree> memIndexStorage =
(MemoryIndexStorage<Integer, SerializedStubTree>) indexStorage;
if (!memIndexStorage.isBufferingEnabled()) {
// if buffering is not enabled, use backend storage to make sure
// the returned stub tree contains no data corresponding to unsaved documents.
// This will ensure that correct set of old keys is used for update
indexStorage = memIndexStorage.getBackendStorage();
}
}
try {
final ValueContainer<SerializedStubTree> valueContainer = indexStorage.read(key);
if (valueContainer.size() != 1) {
LOG.assertTrue(valueContainer.size() == 0);
return result;
}
result.put(key, valueContainer.getValueIterator().next());
return result;
} catch (RuntimeException e) {
final Throwable cause = e.getCause();
if (cause instanceof IOException) {
throw new StorageException(cause);
}
throw e;
}
}