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Aspectizing Design Patterns and Exception Handling: The Devil is in the Details
{ Wed, 29 Nov 2006, 14h00 }

By: Alessandro Garcia  [ show info ]

It is usually assumed that the implementation of certain kinds of crosscutting concerns can be always better modularized by the use of aspect-oriented programming (AOP). Exception handling and several well-known design patterns are often cited in introductory AOP texts as the "killer applications" of aspect-orientation. However, there is no empirical evidence about the scalability of AOP in more realistic scenarios, such as aspectual composition of design patterns and aspectization of heterogeneous forms of exception handling. This talk will present the results and conclusions of two in-depth investigations of the adequacy of the AspectJ language for modularizing error handling and design patterns. The studies consisted in refactoring a number of existing realistic applications so that the code responsible for implementing compositions of design patterns and complicate error recovery strategies were moved to separate aspects. The case studies are based on distinct application domains, including a CVS plugin, a web-based information system, a reflective middleware, and a measurement tool. We have performed quantitative assessments of several systems based on five fundamental modularity attributes, namely separation of concerns, coupling, cohesion, interface simplicity, and conciseness. Our investigation also included a multi-perspective analysis of the refactored systems, including (i) the reusability of the aspectized code, (ii) the beneficial and harmful aspectization scenarios, and (iii) the scalability of AOP in the presence of complex aspect interactions.


Hosted by: Software Systems

Location: Sala de SeminĂ¡rios do CITI

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