System Evolution by Metalevel Modification

This paper describes system evolution managed by corresponding metasystem. The metasystem builds a metamodel of base system and allows its modification. The modification is propagated back to the base system. The application model presents the example of standard graphics user interface developed with Java Abstract Windowing Toolkit (AWT), which is a part of the Java Foundation Classes (JFC). The main aim is to confirm the possibility of application properties monitoring using aspect-oriented programming, their abstraction in ametamodel, possibility of their alternations by metamodel modifications and consequent change in the original application model.