Re-Engineering of the Internet Stream Protocol ST2+ with Formalized Design Patterns
F. Rößler, B. Geppert, P. Schaible
Proceedings of the 5th IEEE International Conference on Software Reuse, ICSR5, Victoria, British Columbia, Canada, 1998
Zusammenfassung
The paper presents a case study on the design of communication protocols using formalized design patterns. On principle, the approach adopts the wellknown design patterns concept for reusing design solutions. However, a formal description technique (FDT) is applied as design language and therefore knowledge about pattern instantiation or its impact on the embedding context can be precisely specified. We consider formalization to be a prerequisite for increased correctness of resulting products and toolsupported pattern application. The FDT of our choice is the specification and description language SDL. Thus pattern application follows strict rules in terms of the SDL syntax. Additionally, assumptions and effects stated in terms of the SDL semantics help to ensure the intended working of an SDLpattern within the embedding context. An SDLpattern based reengineering of the Internet Stream Protocol ST2+ is presented. In particular, it is demonstrated how SDLpattern based design can boost the developer's confidence in the resulting product.
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