generated at
Constructor Injection
from DI

https://qiita.com/kmuro/items/aead50c699fefe56c120
http://pppurple.hatenablog.com/entry/2016/12/29/233141
https://irof.hateblo.jp/entry/2017/04/16/222737
https://freecontent.manning.com/understanding-constructor-injection/