Software Architecture Fundamentals by Mahbouba Gharbi & Arne Koschel & Andreas Rausch

Author:Mahbouba Gharbi & Arne Koschel & Andreas Rausch
Language: eng
Format: epub
Publisher: dpunkt.verlag
Published: 2019-02-12T16:00:00+00:00

3.6.2.3Presentation-abstraction-control

Increasing application functionality also increases the complexity of the user interfaces. With complex user interfaces, different areas of functionality can become intermingled, which reduces maintainability. In addition, simple decomposition (as found in the MVC pattern) results, among other things, in unsatisfactory response times when all user events are processed by a single controller.

In this pattern, the structure of the user interface is broken down into hierarchically cooperative “agents”. Basic functionality is used by intermediate levels that then provide functionalities for the individual, bottom-level elements of the user interface. Each agent consists of a controller, abstraction, and the view. The controller is the agent’s interface to the next higher- and lower-level agents in the hierarchy, and controls its area of responsibility. The abstraction adapts parts of a complete model into a local model that only includes the elements required for the local views. This strictly hierarchical separation enables parallelization of processing operations within the user interface, especially if only parts of the complete model are available.

The Eclipse IDE is a good example: The workbench offers a menu bar, a toolbar, a working area, and a status bar. Perspectives offer these for use as embedded operating elements limited to each perspective’s subject area. These include areas for margin views and editor windows, which are then filled by specific content editors and views with menu entries of their own.

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