@Override
                public void onNext(Object o) {
                    processSuccess(true, context, sofaRequest, o, sofaResponseCallback, future, currentClassLoader);
                }
Build arg sigs for stream calls.

@param requestArgs request args
@return arg sigs, arg.getClass().getName().
remoting/remoting-triple/src/main/java/com/alipay/sofa/rpc/transport/triple/TripleClientInvoker.java