Why Interface Layer/Abstract classes required in our project? [closed]

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The easiest way to understand this, imo, is an abstraction over DataLayer.

You have set a functions to retrieve a data from xml file. But one day your product scales out and xml is not enough like a data storage. So you pass to some embeded database: sqlite. But one day you need to reuse your library in some enterprise context. So now you need to develop access to sqlserver, oracle, webservice…. In all these changes you will need to change not only the code that actually access the data, but the code that actually consumes it too. And what about the code that already use for years your first xml data access on client and happy with it? How about backcompatibility?

Having the abstraction if not direcly solves most of this problems, but definitely makes scallable your application and more resistant to changes, that, in our world, happen sometimes too frequently.

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