API Architecture by Biehl Matthias

Author:Biehl, Matthias
Language: eng
Format: epub
Published: 2015-05-20T16:00:00+00:00

Almost all APIs apply the facade pattern, especially when APIs are used to provide access to legacy systems. An exception may be APIs without any dependencies to legacy systems. They can be found in startups and young companies. In these cases, the API does not require the facade pattern, since the business logic is implemented as part of the API.

Advanced Use of the Facade Pattern

Besides this basic usage of the facade pattern, more advanced uses can be considered. The facade pattern can be used in a layered system in combination with a pipe and filter pattern. This pattern is described in detail in the chapter on API Portfolio Architecture.

The lower level APIs use the facade pattern to hide diverse backend systems, data bases, services, different protocols and provide a consistent API layer. This API provides a large set of data. It cannot be accessed by any external consumers. It is only used internally, as a utility API.

The higher level APIs filter results from the lower level APIs. The API provider can configure these APIs using a filter. The filter configuration is used for tailoring the APIs for specific consumers, devices, or applications. These higher level APIs are accessible by consumers. Moreover, each consumer reaches a customized version of these APIs.

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