如何构建应用程序的目录层次结构中的接口？ [英] How to structure interfaces in application directory hierarchy?

问题描述

把他们都在一个单独的文件夹结构或与类它实现呢？

Put them all in one separate folder structure or along with classes which implements them ?

推荐答案

您永远不应该把接口与实现它们（除非这些类fulfull下列要求）的类。否则，将推出的紧耦合的接口和执行者之间，你将无法创建接口的其他实现不simulataneously引用实施者。

You should never put interfaces together with the classes that implement them (unless those classes fulfull the requirements below). Doing that will introduce a tight coupling between the interface and the implementer, and you will not be able to create other implementations of the interface without simulataneously referencing the implementer.

您基本上有两种选择：

• 将接口与类的消耗他们。这仍产生一个紧耦合，但是这种耦合是少问题的，因为消费者往往生活在一个库，提供相关的类型。在这种情况下，如果你有实施者此库，就可以实现的接口没有引入任何附加耦合。
• 对于最终的松耦合，把接口在一个单独的库。这给了你更大的灵活性，但也可能需要一些额外的工作。

• Put the interfaces together with the classes consuming them. This still creates a tight coupling, but this coupling is less problematic, as the consumers often live in a library that provides related types. In this case, if you have implementers in this library, they can implement the interfaces without introducing any additional coupling.
• For the ultimate in loose coupling, put the interfaces in a separate library. This gives you greater flexibility, but may also requires a bit extra work.

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