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In computing, aspect-oriented software development (AOSD) is a software development technology that seeks new modularizations of software systems in order to isolate secondary or supporting functions from the main program's business logic. AOSD allows multiple concerns to be expressed separately and automatically unified into working systems. 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. Programmers need to keep in mind all the things that need to be done, how to deal with each issue, the problems associated with the possible interactions, and the execution of the right behavior at the right time. These concerns span multiple primary functional units within the application, and often result in serious problems faced during application development and maintenance. The distribution of the code for realizing a concern becomes especially critical as the requirements for that concern evolve – a system maintainer must find and correctly update a variety of situations. 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. ==History== Aspect-Oriented Software Development describes a number of approaches to software modularization and composition including, in order of publication, reflection and metaobject protocols, Composition Filters, developed at the University of Twente in the Netherlands, Subject-Oriented Programming (later extended as Multidimensional Separation of Concerns) at IBM, Feature Oriented Programming at University of Texas at Austin, Adaptive Programming at Northeastern University, USA, and Aspect-Oriented Programming (AOP) at Palo Alto Research Center. The term aspect-oriented was introduced by Gregor Kiczales and his team at Palo Alto Research Center who also first developed the explicit concept of AOP and the AOP language called AspectJ which has gained considerable acceptance and popularity within the Java developer community. Currently, several aspect-oriented programming languages are available for a variety of languages and platforms. Just as object-oriented programming led to the development of a large class of object-oriented development methodologies, AOP has encouraged a nascent set of software engineering technologies, including methodologies for dealing with aspects, modeling techniques (often based on the ideas of the Unified Modeling Language, UML), and testing technology for assessing the effectiveness of aspect approaches. AOSD now refers to a wide range of software development techniques that support the modularization of crosscutting concerns in a software system, from requirement engineering to business process management, analysis and design, architecture, programming and implementation techniques, testing and software maintenance techniques. 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. It is a popular topic of Software Engineering research, especially in Europe, where research activities on AOSD are coordinated by the (European Network of Excellence on Aspect-Oriented Software Development ) (AOSD-Europe), funded by the European Commission. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aspect-oriented software development」の詳細全文を読む スポンサード リンク
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