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Introducing AOP
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his book presents aspect-oriented programming (AOP), which defines a new programming paradigm. By the word paradigm, we mean a set of principles that structure the modeling of programs and, as a consequence, the development of programs. As its name suggests, aspect-oriented programming introduces a new concept that of the aspect. Some years ago, object-oriented programming (OOP) introduced the concept of the object, which initiated a new way to structure applications and write programs. The same idea applies to the concept of the aspect. In 1996, Gregor Kiczales and his team at the Palo Alto Research Center (PARC), a subsidiary of Xerox Corporation that is located in California, originally defined the concept of the aspect. Although this definition made 1996 the official birthday of AOP, many of AOP s underlying ideas preceded this date. Some of OOP s limitations motivated the introduction of the aspect, which also originated in research domains, such as those of reflection and the meta-object protocol. After the concept of the aspect was defined, an aspect-oriented language, named AspectJ, was soon implemented, with the first versions made available in 1998. AspectJ, which remains the most popular AOP language, extends the Java language with new keywords that make it possible to program aspects. Above and beyond AspectJ, AOP itself has remained a subject of great interest since 1998 within the research community. As a result, many other languages and tools, the majority of which are constructed around Java, have been developed. These include Java Aspect Components (JAC), JBoss AOP, and AspectWerkz. Despite the focus on Java, it s important to keep in mind that nothing about AOP is specific to OOP in general or Java in particular. The notion of the aspect is an abstract concept that, like the notion of the object, can be applied to different languages. Tools of varying completeness exist to support AOP in C, C++, C#, and Smalltalk. Furthermore, any existing language could be extended to support the concepts of AOP. Because the concept of the aspect is relatively new, encouraging a large community of developers to adopt AOP is an important task.
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Looking at Programming Paradigms
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Viewed as a programming paradigm, you can see AOP as OOP s successor. However, the aim of AOP is not to replace OOP, but to complement it, allowing you to create clearer and better-structured programs. Since the introduction of assembly language, a family of programming paradigms has been developed that allows programmers to create software of increasing complexity. The concepts of the procedure and the object have, each in their own ways, contributed to better
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CHAPTER 1 INTRODUCING AOP
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code structuring and greater manageability of large programs. Think of AOP, which aims to continue this tradition, as the latest addition to this family of paradigms. For example, the concept of the procedure, which languages such as Pascal embody, allows you to partition a program into entities called procedures. As you know, each procedure is simpler to write and understand than the program as a whole is. You therefore build a program as a set of procedures that call one another. The use of procedures aids the development of large applications because individuals on a team can independently develop procedures. Individuals can also test procedures independently, allowing programming errors to be more easily located. Although the transition was not instantaneous, procedural programming contributed to the disappearance of the goto instruction. This instruction, which transferred execution to a specific line of the program, tended to cause spaghetti code. In other words, the program would quickly become tangled preventing the ability to reuse some parts of the program independently of others. Procedural programming, on the other hand, allows you to code elementary tasks that each contain clearly identified beginning and end points. This type of programming makes it possible to create libraries of procedures that can be reused by many different programs. Procedural programming simplifies the coding process. It allows programmers to develop modular hence more understandable programs by giving a clearer structure to the code. However, procedural programming does not provide a secure structure for any of the data. Indeed, one of the great weaknesses of this paradigm is that global variables can be accessed from anywhere in the program and doing so improperly can lead to unexpected side effects.
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