Stuart Sierra - Components Just Enough Structure

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Sierra 让组件声明依赖，系统据此计算启动顺序。数据库和邮件服务由外层装配，业务组件从自身字段取得它们，启动依赖不再藏在调用顺序里。

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I'm going to do is declare my dependencies and they'll get filled in later

do a topological sort on that graph