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Created May 19, 2023 09:18
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Layers Pattern.md

Extract from POSA 4

The specific partitioning criteria can be defined along various dimensions, such as abstraction, granularity, hardware distance, and rate of change.

The abstraction dimension

For example, a layering that partitions an architecture into presentation, application logic, and persistent data follows the abstraction dimension.

The granularity dimension

A layering that introduces a business object layer whose entities are used by a business process layer follows the granularity dimension,

The hardware distance dimension

while one that suggests an operating system abstraction layer, a communication protocol layer, and a layer with application functionality follows the hardware distance dimension.

The rate of change dimension

Using rate of change as a layering criteria separates functionalities that evolve independently of one another.

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