23.3. Factory (GoF)
The adapter raises a new problem in the design: In the prior Adapter pattern solution for external services with varying interfaces, who creates the adapters? And how to determine which class of adapter to create, such as TaxMasterAdapter or GoodAsGoldTaxProAdapter?
If some domain object creates them, the responsibilities of the domain object are going beyond pure application logic (such as sales total calculations) and into other concerns related to connectivity with external software components.
This point underscores another fundamental design principle (usually considered an architectural design principle): Design to maintain a separation of concerns. That is, modularize or separate distinct concerns into different areas, ...
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