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Main.ThijsReusr1.4 - 08 Feb 2006 - 22:52 - ArieVanDeursen

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Thijs Reus

Harvesting existing software systems for MDA-based reengineering

Software systems degrade over time: they are affected by a phenomenon called aging. It makes using and changing the software hard, risky and expensive. Therefore migration projects are initiated, for example reengineering projects to revitalize degraded systems. OMG’s MDA provides means to prevent, or at least slow down, software aging. It focuses on models rather than code, which is merely a derivate of the models. MDA makes reengineering projects more attractive by preventing the necessity of reengineering again in the near future.

Currently MDA-based reengineering gains more attention both in industry and academics. This thesis describes the process and results of the Master project in which we aimed to provide means and a process for MDA-based reengineering. A flexible workbench solution has been developed for reverse engineering textual sources into MDA-ready UML models, a process which we call harvesting. The commercial, state of the art MDA-tool ArcStyler has been used as target environment for harvested UML models. To improve reusability of harvesting components, a generic model is used as an intermediate step in the harvesting process, which makes investments in more comprehensive harvesting assets economically attractive. It is a first attempt to provide an initial generic intermediate model, for which evolution during usage in different projects is foreseen.

The workbench has been tested on a 178 KLOC PL/SQL production system in a case study. The textual sources have been harvested using the generic intermediate model, based on which UML class and collaboration diagrams have been created to give insight in the structure and to some extent in the behavior of the system. Although the current prototype implementation suffers from scalability issues, parallel harvesting has proved to be an effective countermeasure. As a showcase, the harvesters have been adapted to another PL/SQL system, of which 33 KLOC have successfully been harvested to show adaptability of the solution.

The generated UML models have been used for documentation and code generation following the MDA philosophy, currently resulting in code without behavior implementation.


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MscThijsReusFinal.pdf manage 1834.0 K 08 Feb 2006 - 22:50 ArieVanDeursen MSc Thesis Thijs Reus

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