private String[] rebuildTrueRequestArgSigs(Object[] requestArgs) {
        String[] classes = new String[requestArgs.length];
        for (int k = 0; k < requestArgs.length; k++) {
            if (requestArgs[k] != null) {
                classes[k] = requestArgs[k].getClass().getName();
            } else {
                classes[k] = void.class.getName();
            }
        }
        return classes;
    }
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