Layer Facade

<Underdevelopment>

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• 1. Layer Facade. For larger systems, it is common to use the Facade patternto provide a single unified interface to a layer or subsystem instead of developing an abstract interface for each exposed component [Gamma95]. This gives you the lowest coupling between layers, because higher-level components only reference the facade directly. Be sure to design your facade carefully. It will be difficult to change in the future, because so many components will depend on it.