一种建模软件体系结构非功能属性的方法

非功能属性的处理一直是困扰着研究人员和实践者的难题.针对体系结构设计阶段早期,提出一种建模非功能属性的方法.该方法利用面向方面软件开发中的关注点多维分离原理,提出建模软件体系结构的"1+X"模型,并在此基础上进一步划分体系结构非功能属性的维度,归纳各个维度上的关注点,利用XML对维度和关注点进行规约.该模型为后续设计面向方面的软件体系结构奠定了基础,为体系结构设计人员提供了方法支持,而且该成果可以直接用于不同领域内的软件体系结构设计.     

一种软件体系结构关注点多维分离模型

传统方法设计出的体系结构中始终存在着一些横切现象,使得体系结构变得复杂、难以理解、难以演化和难以重用.基于关注点分离和面向方面软件开发的相关理论,探讨了体系结构中的关注点,提出一种体系结构层关注点多维分离模型.该模型通过形象地表示关注点之间的关系,识别那些在体系结构中可能产生横切的关注点,有效解决传统软件体系结构设计中存在的关注点横切问题,为软件体系结构的演化和重用提供了重要的指导作用.     

一种基于横切特征分析的软件体系结构自动重构方法

软件体系结构中的横切关注点增加了软件体系结构的复杂性,从而加剧了体系结构演化与维护的困难.这种设计问题可以通过体系结构层面的重构来进行改善.在已有的横切特征分析方法基础上,提出了一种面向横切特征分析的体系结构自动重构方法.该方法首先基于特征与构件之间的追踪关系分析横切特征,然后将与横切特征有直接追踪关系的构件从初始体系结构中提取出来,实现方面构件,完成体系结构重构.在面向方面体系结构描述语言AO-ADL基础上开发了相应的体系结构重构工具,并针对一个业务系统进行了体系结构重构实验.实验结果表明,该方法能有效地实现体系结构横切特征的自动化重构.     

面向方面软件体系结构建模研究

用面向方面编程思想研究软件体系结构,提取体系结构中的横切属性,并以方面连接件的形式对其进行建模,然后提出基于UML的面向方面体系结构元模型,最后通过图书管理系统实例说明具体建模过程,对传统体系结构模型和面向方面体系结构模型进行比较分析,结果表明了面向方面软件体系结构模型具有更高的实际应用价值.     

一种软件体系结构关注点分析方法

在体系结构的设计、演化和重用过程中涉及众多的关注点,而且它们之间存在着复杂的关系,然而目前还缺乏有效的对这些关注点及其关系进行描述和分析的方法.针对这一问题,在系统收集并显式标识各种体系结构关注点及其关系的基础上,文中提出一种软件体系结构关注点分析方法.该方法利用时段时序逻辑对关注点之间的横切关系进行形式化描述和分析,可以发现横切关注点之间的时序冲突,有助于提高面向方面软件体系结构的设计质量.最后结合案例给出了该方法的实施过程.     

面向方面的体系结构描述语言AC2-ADL

体系结构描述语言(ADL)是基于体系结构的软件开发的基础,传统的ADL由于缺乏对混杂与分散在软件体系结构多个单元中的各种设计决策的描述能力,导致软件体系结构设计方案难以理解、难以演化和难以重用.通过设计面向方面的软件体系结构描述语言AC2-ADL,使用方面组件明确地描述系统的横切关注点;并引入方面连接件以及抽象出软件体系结构语境中的注入点,呈现结构之间复杂的交互,以解决不同关注点的分散和交织等问题,试图为设计和描述面向方面的软件系统的软件体系结构提供一种有效的解决方案.研究结合电子商务领域的网上拍卖系统,讨论了该语言的主要应用过程,具有一定的参考作用.     

基于UML面向方面动态行为建模

面向方面动态行为建模在设计阶段实现了横切关注点的分离,能更好的解决编程阶段代码的纠缠和散射问题,从而提高了软件的可重用性,可维护性,可跟踪性.由于面向对象的动态行为建模通常由标准的面向对象建模语言UML表示,所以文章在UML的基础上,建立面向方面横切关注点的动态模型.     

基于面向方面MDA的软件开发方法

软件系统通常有许多横切整个系统的非功能需求,仅采用面向对象的方法不能很好的处理这些横切关注点.软件开发中使用面向方面MDA的方法,在设计阶段将系统的非功能需求从功能需求中分离出来,通过扩展UML建立面向方面PIM元模型和基于AspcctJ的PSM元模型,横切关注点和核心业务逻辑就可以根据这些元模型分别建模,从而形成面向方面PIM和PSM,然后将系统PSM转换成系统代码.这种方法降低了软件开发的复杂性,提高了系统的可重用性、可维护性和横切关注点的模块化程度,最后给出了应用实例.     

面向方面的软件体系结构描述语言AO-ADL

分析面向方面编程(AOP)的核心思想及其优越性,将编码阶段的AOP概念进一步提升到软件体系结构层次。在软件体系结构描述语言XYZ/ADL的基础上,通过增加新的元素和相关复合机制,得到一种面向方面的体系结构描述语言AO-ADL,实现了在软件体系结构中横切功能的模块化。     

基于UML模型的面向方面建模

面向方面建模的目标是将面向方面的思想应用到设计阶段。目前面向方面建模的相关研究仍处于起步阶段。本文采用基于UML模型的方法,分别从动态横切和静态横切的角度,根据连接点、切入点、通知、类型间声明的语义,结合AspectJ对横切关注点进行建模。文章所描述的面向方面建模方法考虑了连接点所在的业务环境,用顺序图和活动图描述连接点,用交互概览图描述切入点,用活动图描述通知,用类图描述类型间声明,使得编写方面的编码人员能够更好地理解业务需求。     

A Petri net-based approach for supporting aspect-oriented modeling

The concept of aspect-orientation allows for modularizing crosscutting concerns as aspect modules. Aspect-orientation originally emerged at the programming level, and has stretched over other development phases now. Among them aspect-oriented modeling (AOM) is a hot topic, and there are many approaches supporting it. Petri net is a good formalism which can provide the foundations for modeling software and simulating its execution, but fails to resolve the problem of crosscutting concerns to support AOM. So, this paper presents an approach which extends the Petri net so as to support the AOM. In this paper, the basic functions of the system are modeled as base net by Petri net, and the crosscutting concerns are modeled as aspect nets. In order to analyze the whole system, woven mechanism is proposed to compose the aspect nets and base net together. The problems about aspect-aspect conflict and conflict relations may exist among the aspect nets matching the shared join point, thus this paper propose solutions to resolve them. The Object Petri net which is an extension of traditional Petri net is also extended so as to support aspect-oriented modeling here.     

A Petri net-based approach for supporting aspect-oriented modeling

The concept of aspect-orientation allows for modularizing crosscutting concerns as aspect modules. Aspect-orientation originally emerged at the programming level, and has stretched over other development phases now. Among them aspect-oriented modeling (AOM) is a hot topic, and there are many approaches supporting it. Petri net is a good formalism which can provide the foundations for modeling software and simulating its execution, but fails to resolve the problem of crosscutting concerns to support AOM. So, this paper presents an approach which extends the Petri net so as to support the AOM. In this paper, the basic functions of the system are modeled as base net by Petri net, and the crosscutting concerns are modeled as aspect nets. In order to analyze the whole system, woven mechanism is proposed to compose the aspect nets and base net together. The problems about aspectaspect conflict and conflict relations may exist among the aspect nets matching the shared join point, thus this paper propose solutions to resolve them. The Object Petri net which is an extension of traditional Petri net is also extended so as to support aspect-oriented modeling here.     

Generating CAM aspect-oriented architectures using Model-Driven Development

Aspect-Oriented Software Development promotes the separation of those concerns that cut across several components and/or are tangled with the base functionality of a component, through all phases of the software lifecycle. The benefit of identifying these crosscutting concerns (aspects) at the architectural level in particular is to improve the architecture design and its subsequent evolution, before moving onto detailed design and implementation. However, software architects are not usually experts on using specific AO architecture notations. Therefore, the aim of this paper is to provide support to define and specify aspect-oriented (AO) architectures using non-AO ones as the source. We will use the Model-Driven Development approach to transform a component-based architecture model into an AO architecture model. The CAM (component and aspect model) model and the DAOP–ADL language are the proposals used for modelling and specifying AO architectures. We will show how we automated part of the process and the tool support.     

Stability assessment of aspect-oriented software architectures: A quantitative study

Design of stable software architectures has increasingly been a deep challenge to software developers due to the high volatility of their concerns and respective design decisions. Architecture stability is the ability of the high-level design units to sustain their modularity properties and not succumb to modifications. Architectural aspects are new modularity units aimed at improving design stability through the modularization of otherwise crosscutting concerns. However, there is no empirical knowledge about the positive and negative influences of aspectual decompositions on architecture stability. This paper presents an exploratory analysis of the influence exerted by aspect-oriented composition mechanisms in the stability of architectural modules addressing typical crosscutting concerns, such as error handling and security. Our investigation encompassed a comparative analysis of aspectual and non-aspectual decompositions based on different architectural styles applied to an evolving multi-agent software architecture. In particular, we assessed various facets of components’ and compositions’ stability through such alternative designs of the same multi-agent system using conventional quantitative indicators. We have also investigated the key characteristics of aspectual decompositions that led to (in)stabilities being observed in the target architectural options. The evaluation focused upon a number of architecturally-relevant changes that are typically performed through real-life maintenance tasks.     

一种基于面向侧面技术的并发式软件建模方法

基于面向侧面（Aspect-Oriented）技术及统一建模语言状态图提出了并发式软件系统开发过程中横切特性的建模方法。本方法将并发软件系统的业务逻辑和横切行为分别封装到复合状态的不同正交区域中，并通过事件广播机制反映二者的交互关系。同时，以模块化的状态迁移系统 （Modular Transition System）作为基本计算模型，对该建模方法进行形式化描述，给出了模型元素及建模过程的精确语义。实例研究表明，该方法在并发软件设计阶段实现了横切关注点的分离策略，并使得系统模型具有松耦合、适应性和可跟踪性的优点。     

一种基于模板的面向方面重构框架的研究

面向方面编程是一种新的编程范型，而面向方面重构则是当前面向方面软件开发中的一个研究热点。首先对面向方面重构进行了分类研究，然后引入基于角色的横切关注点重构方法，最后在此基础上提出一种基于模版的面向方面重构框架。