Associative Modeling and Programming
نویسنده
چکیده
The notion of associations is motivated and presented. This kind of association is seen as first class a concept in notations at both modeling and programming level. Among others the association support evolution of systems by adding descriptions and instantiations of associations to executing systems. 1 Motivation We briefly motivate our introduction of the notion of association by the problems with object-centric modeling and programming and exemplify non object-centric abstractions by the relation from [18]. Next we briefly introduce concepts from pervasive and ubiquitous computing and motivate associations by the very dynamic nature of such systems—illustrated by an intuitive example system. Finally we give a schematic outline of our notion of associations. 1.1 Object-Centric Modeling The notion of associations is already available in object-oriented modeling. In objectoriented programming associations are implemented by means of references. We discuss an extension of the existing notion of associations in both modeling and programming. We make the association a first class concept in our modeling and programming notation. In a later section we return to the background for our work including a brief overview of related work on relations and associations. In classical object-centric modeling and programming the fundamental problem is that “no object is an island” [2]. In object-oriented systems • The object supports encapsulation • The object is self-contained • The focus is on structure instead of function • The focus is on methods instead of processes These characteristics are all seen as appreciated properties of object-oriented systems, but they also form essential problems because they all emphasize an object-centric point of view.
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تاریخ انتشار 2002