protected void recordClientElapseTime(RpcInternalContext context) {
        if (context != null) {
            Long startTime = (Long) context.removeAttachment(RpcConstants.INTERNAL_KEY_CLIENT_SEND_TIME);
            if (startTime != null) {
                context.setAttachment(RpcConstants.INTERNAL_KEY_CLIENT_ELAPSE, RpcRuntimeContext.now() - startTime);
            }
        }
    }
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