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Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition by Craig Larman

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30.2. Architectural Pattern: Layers

The essential ideas of the Layers pattern [BMRSS96] are simple:

  • Organize the large-scale logical structure of a system into discrete layers of distinct, related responsibilities, with a clean, cohesive separation of concerns such that the “lower” layers are low-level and general services, and the higher layers are more application specific.

  • Collaboration and coupling is from higher to lower layers; lower-to-higher layer coupling is avoided.

Solution

A layer is a large-scale element, often composed of several packages or subsystems.

The Layers pattern relates to the logical architecture; that is, it describes the conceptual organization of the design elements into groups, independent of their physical packaging ...

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