Wim Vanderperren
ABSTRACT
In this paper we propose an extension to JAsCo for supporting Adaptive Programming in a Component-Based Software Development context. JAsCo is an aspect-oriented programming language targeted at Component-Based Software Development and allows encapsulating crosscutting concerns using highly reusable aspect beans. Adaptive Programming on the other hand, allows capturing crosscutting concerns by structure-shy adaptive visitors. We propose to implement an adaptive visitor as a regular JAsCo aspect bean. Hence, the reusability of an adaptive visitor is improved because the same visitor can be reused within different component contexts. We introduce JAsCo traversal connectors to deploy adaptive visitors, implemented as JAsCo aspect beans, upon a concrete component traversal. In addition, these traversal connectors allow to explicitly specify how the behavior of several adaptive visitors, instantiated onto the same component traversal, needs to be combined by making use of the JAsCo precedence and combination strategies. A prototype implementation of the JAsCo Adaptive Programming extension, which employs the DJ library, is available. As a proof of concept, we present an extended case study in the context of the Web Service Management Layer (WSML) project. In this case study, a set of visitors implemented in JAsCo is reused to accomplish multiple tasks.
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