Motivation and Requirements for a Versatile AOP Kernel

Aspect-Oriented Programming (AOP) is a promising approach to modularizing software in presence of crosscutting concerns. Numerous proposals for AOP have been formulated, some of them generic, others specific to particular concerns. There are commonalities and variabilities among these approaches, which are worth exploring. Unfortunately, in practice, these various approaches are hard to combine and to extend. This results from the fact that the corresponding tools, such as aspect weavers, have not been designed to be used along with others, although they usually perform very similar low-level tasks. In this paper, we suggest to include common functionality into a versatile kernel for AOP. Such a kernel alleviates the task of implementing an aspect-oriented approach by taking care of basic program alterations. It also lets several approaches coexist without breaking each other by automatically detecting interactions among aspects and o#ering expressive composition means. From a review of the main features of Aspect-Oriented Programming, we present the main issues that the design of such an AOP kernel should address: open support for aspect languages taking care of both behavior and structure, base language compliance, and aspect composition. An AOP kernel for Java is currently under development.