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Traditional software development focuses on decomposing systems into units of primary functionality, while recognizing that there are other issues of concern that do not fit well into the primary decomposition. The traditional development process leaves it to the programmers to code modules corresponding to the primary functionality and to make sure that all other issues of concern are addressed in the code wherever appropriate. Aspect-oriented software development focuses on the identification, specification and representation of cross-cutting concerns and their modularization into separate functional units as well as their automated composition into a working system. Currently, several aspect-oriented programming languages are available for a variety of languages and platforms. Aspect-oriented software development has constantly gained in popularity, and is the subject of an annual conference, the International Conference on Aspect-Oriented Software Development, held for the first time in 2002 in Enschede, The Netherlands. AOSD is a rapidly evolving area. The motivation for aspect-oriented programming approaches stem from the problems caused by code scattering and tangling.
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The purpose of Aspect-Oriented Software Development is to provide systematic means to modularize crosscutting concerns. The implementation of a concern is scattered if its code is spread out over multiple modules. The concern affects the implementation of multiple modules. The implementation of a concern is tangled if its code is intermixed with code that implements other concerns. The module in which tangling occurs is not cohesive. Scattering and tangling often go together, even though they are different concepts.
Aspect-oriented software development considers that code scattering and tangling are the symptoms of crosscutting concerns. Classloading in Tomcat is a modular concern with respect to the system decomposition. Its implementation is contained in a small number of classes and is not intertwined with the implementation of other concerns. Logging in Tomcat is a crosscutting concern.