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CHAPTER 2 THE CONCEPTS OF AOP
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Implementing an aspect consists of defining advice code and pointcuts. The advice code defines what the behavior of the aspect is, and pointcuts define where this behavior is to be applied in the application. The point in the program execution where an aspect applies is called a joinpoint. AOP provides the additional notion of introduction, which is the mechanism for extending an application.
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AspectJ
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n the previous chapter, we presented the basic concepts of AOP with the notions of the aspect, the pointcut, the joinpoint, and the advice code. In this chapter, we will illustrate the way that these concepts are implemented in AspectJ. The syntax and concepts presented here correspond to version 1.2.1 of the language. Gregor Kiczales and his team, who are credited with the creation of AOP at the Palo Alto Research Center (PARC), are responsible for the invention and development of AspectJ which is now the leading tool for AOP. The first versions of AspectJ were released in 1998 and, as of December 2002, the AspectJ project has left PARC and joined the open-source Eclipse community. Today, AspectJ is the most widely used aspect-oriented language.
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THE HISTORY OF ASPECTJ
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The histories of AspectJ and AOP are closely related. AspectJ has always been considered by Gregor Kiczales as the project that would illustrate the concepts of AOP. Although the notion of the aspect dates back to 1996, and the first versions of AspectJ were released in 1998, the ideas and research that culminated in AOP date back to before this time. Research in reflection in the 1980s and work on open implementations in the 1990s served as background for the development of AOP. Invented in 1984 by Brian Smith, and studied and popularized by Patricia Maes in 1997, reflection is a programming technique that introduces a two-level architecture. The first level, called the base level, consists of the application. The second level, called the meta level, controls and supervises the base level. Although the notions of the aspect and the meta level differ, they share a common goal: to separate business functionalities from technical concerns. This separation aims to result in better modularization of programs. Prior to inventing the concept of the aspect, Kiczales spent time conducting research in the domain of reflection. In 1991, he was coauthor of The Art of the Metaobject Protocol (MIT Press, 1991). The founding document of AOP was published and presented in 1997 by Kiczales during the European Conference on Object-Oriented Programming (ECOOP). Presentations had been held previously, in 1996, but the 1997 article is considered seminal. Simultaneously, the first prototypes of AOP languages appeared in 1996 97. Christina Lopez, a member of Kiczales s team at the time and an important contributor, developed the D language and its implementation, DJava. The D language contained two types of aspects: distribution and concurrency-management. Soon after, Lopez and Kiczales realized that this new approach could be generalized and applied to other aspects. A general-purpose language that could implement any kind of aspect was needed. In 1998, Kiczales and his team made the decision to switch from D to AspectJ. Soon after, the first implementations of AspectJ were released. At almost the same time, Aspect-Oriented Tcl Object System (A-TOS),
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CHAPTER 3 ASPECTJ
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which was the first prototype of Java Aspect Components (JAC), was implemented. Since then, several versions of AspectJ have been released, and each one has included new features and/or bug fixes. The first major version of AspectJ, designated version 1.0, was released in November 2001. This was also the year during which AOP was fully recognized by the international computer-science community. A special edition of the leading journal, Communications of the ACM, was devoted to AOP. In December 2002, the AspectJ project left PARC and joined the open-source Eclipse community. Since then, the AspectJ Development Tools (AJDT) plug-in has been developed. It enables you to write, compile, and run an aspect-oriented program within the IBM Eclipse IDE.
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