@Override
 public String synStream(String path) throws Exception {
   if (stream == null) {
     return null;
   }
   return stream.synSendStream(path, this);
 }
 @Override
 public void stream(String path, IStreamReady ready) {
   stream.sendStream(path, this, ready);
 }
 public String synStream(String path, RpcClientChannel rpcChannel) throws Exception {
   return stream.synSendStream(path, rpcChannel);
 };