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Pete Whitney

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Experienced developers know many of the benefits of and motivations for using interface-based design principles. Interfaces provide for polymorphic behavior by hiding the implementation and only exposing the relevant public methods of the implementing class. What may be less appreciated is that the use of interfaces, when applied to an entire application, can provide for application isolation, while at the same time enhancing testing capabilities. In this article we'll explore the use of interfaces at all application boundaries and gain an appreciation for why we should consider, and possibly even mandate, interface-based design principles at all application boundaries. This mandate should apply even if application requirements or application design do not call for diffe... (more)