https://www.ibm.com/developerworks/cn/linux/l-cn-gpb/index.html
https://originlee.com/2015/03/14/analysis-google-protobuf-reflection/
https://www.cnblogs.com/swey/p/4733638.html
https://www.jianshu.com/p/e692a6a2f78e
http://www.udpwork.com/item/8132.html
http://arganzheng.life/reflection-of-protobuf.html
https://developers.google.com/protocol-buffers/docs/reference/cpp/google.protobuf.service
https://groups.google.com/forum/#!topic/protobuf/q86dv6RBDsU