public Future<Long> sortStore(K key, SortArgs sortArgs, K destination) {
CommandArgs<K, V> args = new CommandArgs<K, V>(codec).addKey(key);
sortArgs.build(args, destination);
return dispatch(SORT, new IntegerOutput<K, V>(codec), args);
}
public Future<List<V>> sort(K key, SortArgs sortArgs) {
CommandArgs<K, V> args = new CommandArgs<K, V>(codec).addKey(key);
sortArgs.build(args, null);
return dispatch(SORT, new ValueListOutput<K, V>(codec), args);
}