基于AOP的面向对象程序的单元测试

单元测试被视为横切关注点，在软件测试过程中很重要。而面向方面编程(AOP)的主要目标就是分离横切关注点，因此，单元测试非常适合用AOP来解决。该文提出了在对面向对象程序进行单元测试时遇到的问题，并用AOP方法加以解决，同时比较了传统方法和AOP方法进行单元测试的优缺点。     

Profiling with AspectJ

This paper investigates whether AspectJ can be used for efficient profiling of Java programs. Profiling differs from other applications of AOP (e.g. tracing), since it necessitates efficient and often complex interactions with the target program. As such, it was uncertain whether AspectJ could achieve this goal. Therefore, we investigate four common profiling problems (heap usage, object lifetime, wasted time and time‐spent) and report on how well AspectJ handles them. For each, we provide an efficient implementation, discuss any trade‐offs or limitations and present the results of an experimental evaluation into the costs of using it. Our conclusions are mixed. On the one hand, we find that AspectJ is sufficiently expressive to describe the four profiling problems and reasonably efficient in most cases. On the other hand, we find several limitations with the current AspectJ implementation that severely hamper its suitability for profiling. Copyright © 2006 John Wiley & Sons, Ltd.     

面向方面状态模型的UML扩展实现

面向方面编程作为一种基于关注分离的软件开发思想,抽取出软件的功能性和非功能性属性,并引入实现横切关注点的方面,以织入的方式完成系统集成.然而面向方面编程方法只体现在软件生命周期的编码阶段,而缺少在设计阶段的支持.通过分析面向方面编程的概念及其特点,利用UML的扩展机制将方面加入状态图中,给出基于AspectJ语法语义扩展UML的状态模型,实现状态图方面与核心组件之间的织入关系,最终实现代码自动生成.     

一种实用的对象持久化框架

面向方面编程分离了核心关注点和横切关注点,提供了模块化横切关注点的机制,很好地解决了面向对象技术处理横切关注点时存在的代码散布和代码纠缠问题.和日记记录、安全验证等业务一样,持久化也被认为是经典的横切关注点业务,适合用AOP来实现.分析了现有的基于AOP的持久化实现,发现大部分实现过于追求AOP要求的obliviousness特性,而在功能或性能上难以满足现实应用的需求.探讨了持久化的特点及持久方面化的机制,提出了一套实用的基于AOP的持久化框架.该框架保持了面向对象持久化技术的功能及性能,同时又具有方面化持久业务所带来的更高的可重用性、可维护性及可移植性.     

面向方面编程研究

本文阐述了面向方面编程（Aspect-Oriented Programming，AOP）的引入、实现技术，并介绍了AOP在Java平台下的一个实现——AspeccJ的应用，最后分析了AOP的技术优势．     

An Aspect-Oriented Approach to Modular Behavioral Specification

Behavioral interface specification languages, such as Java Modeling Language (JML), can be used to specify the behavior of program modules. We have developed a behavioral interface specification language Moxa, an extension of JML. Moxa provides a new modularization mechanism called assertion aspect that can capture the crosscutting properties among assertions. In this paper, we briefly explain the notion of assertion aspects and the design of Moxa, and then we show an example specification. By comparing the specification to its JML counterpart, we show that the use of assertion aspects clarifies the large, complex specification and greatly simplifies each assertion in the specification.     

面向方面编程研究

本文阐述了面向方面编程(Aspect-OrientedProgramming,AOP)的引入、实现技术,并介绍了AOP在Java平台下的一个实现——AspectJ的应用,最后分析了AOP的技术优势。     

对AspectJ中Call和Execution语义的研究

AOP(面向方面编程)提供了一种有效的方法封装软件中的横切行为,AspectJ是对Java的一个通用AOP扩展。本文首先分析call和execution这两种类型PCD的语义,然后指出这两个PCD基于的一个共同基础存在语义上的不一致,最后基于前面的讨论分析给出了使用这两类PCD的使用建议。     

基于JAAS的认证授权系统的设计与实现

在传统的面向对象程序设计方法中使用JAAS会导致认证和授权代码与业务逻辑的实现代码纠缠在一起,不利于重用和维护.而基于面向方面的软件开发技术--AOP,利用方面封装现有的认证授权逻辑,可以保证业务逻辑和认证授权的有效分离.以现代软件的发展趋势以及传统基于OOP的开发技术为背景研究了JASS认证和授权机制,分析了传统方法的优缺点.利用AOP设计了基于JASS的认证授权系统,并通过原型系统的构造,验证了AOP技术实现认证授权系统的可行性和有效性.     

On the modularization and reuse of exception handling with aspects

This paper presents an in‐depth study of the adequacy of the AspectJ language for modularizing and reusing exception‐handling code. The study consisted of refactoring existing applications so that the code responsible for implementing error‐handling strategies was moved to newly created exception handler aspects. We have performed quantitative assessments of five systems—four object‐oriented and one aspect‐oriented—based on four key quality attributes, namely separation of concerns, coupling, cohesion, and conciseness. Our investigation also included a multi‐perspective analysis of the refactored systems, including (i) the extent to which error‐handling aspects can be reused, (ii) the beneficial and harmful aspectization scenarios for exception handling, and (iii) the scalability of AOP to support the modularization of exception handling in the presence of other aspects. Copyright © 2009 John Wiley & Sons, Ltd.