February 2013
Intermediate to advanced
656 pages
21h 26m
English
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Dependency Inversion Principle
There is a way to improve on the traditional Layers Architecture by adjusting the way dependencies work. The Dependency Inversion Principle (DIP) was postulated by Robert C. Martin and described in [Martin, DIP]. The formal definition states:
High-level modules should not depend on low-level modules. Both should depend on abstractions.
Abstractions should not depend upon details. Details should depend upon abstractions.
The essence of this definition is communicating that a component that provides low-level services (Infrastructure, for this discussion) should depend on interfaces defined by high-level components (for this discussion, User Interface, Application, and Domain). While there are several ways to express ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.