Why is the principle stating that "interfaces should belong to the package that uses values of the interface type, not the package that implements those values" sometimes violated?

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#Server Applications #Etcd #Kubernetes #Go #Microservice

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  • etcd

    Distributed reliable key-value store for the most critical data of a distributed system

    While exploring popular projects such as etcd and especially traefik, I noticed a violation of the principle that states "interfaces should belong to the package that uses values of the interface type, not the package that implements those values." For example, Here we can see that ManagerFactory import Registry interface that placed here and implementations of this interface in the same package, which violates the aforementioned principle. Even if the interface is simply a specification, it should still be defined on the consumer side. Is it considered bad practice to follow what traefik does in this case or I doesn't understand somthing? P.S. I'm newcomer, so sorry if it's silly question.

  • traefik

    The Cloud Native Application Proxy

    While exploring popular projects such as etcd and especially traefik, I noticed a violation of the principle that states "interfaces should belong to the package that uses values of the interface type, not the package that implements those values." For example, Here we can see that ManagerFactory import Registry interface that placed here and implementations of this interface in the same package, which violates the aforementioned principle. Even if the interface is simply a specification, it should still be defined on the consumer side. Is it considered bad practice to follow what traefik does in this case or I doesn't understand somthing? P.S. I'm newcomer, so sorry if it's silly question.

  • ONLYOFFICE

    ONLYOFFICE Docs — document collaboration in your environment. Powerful document editing and collaboration in your app or environment. Ultimate security, API and 30+ ready connectors, SaaS or on-premises

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