应用Web Services技术实现的软件重用

随着计算机技术在工程领域内的广泛应用,为了开发一些实用的应用软件,对一些大型软件的重用和软件二次开发的研究成为趋 势,该文介绍了如何使用Web Services和软件的自动化技术实现软件重用,使应用软件更加模块化和易操作,也使得软件的二次开发更为 容易。     

软件重用的实现

一、引言软件重用是软件工程研究的重要课题。软件重用又称软件复用或软件再用,是指在构造新的软件系统的过程中利用已有的软件成分。这里所说的已有的软件成分不单单指源程序代码,它包括十分广泛的内容,如数据,文档,模式,体系结构,知识,方法,环境等多方面的内容。从广义上说,软件重用包括三个层次:     

软件重用的实现

软件重用是指在构造新的软件系统的过程中利用已有的软件成分，本文从实现，设计和体系一个层次上讨论了几种软件重用方法。文中指出，抽象是软件重用技术的基础；面向对象的一些机制可以有效地支持软件成分的重；面向对象的程序设计技术是目前最成功的软件重用技术。建立丰富的软件可重用成分库和建造用于管理可重用成分的软件开发环境，就可以形成基于软件重用的新的软件开发范型。     

软件重用的实现

软件重用是指使用已有的软件成分构造新的软件系统的过程，本文分３个层次讨论了重用的方法，实现层，设计层，体系结构层的软件重用，同时指出，抽象是实现软件重用技术的基础，面向对象技术提供了多种支持软件重用的机制，通过建立一个可重用软件对象库，和构造用于管理可重用对象的软件开发环境，形成一种新的基于软件重用的软件开发范型，必将对软件开发产生深远的影响。     

DSSRE：基于WWW的分布式软件重用支撑环境

软件重用被视为解决软件危机、提高软件生产率和质量的有效途径。传统的软件重用的活动仅限于机构或企业的内部,随着Internet应用的逐渐普及,WWW已经发展成为一个巨大的分布式信息空间,为用户提供了一个极具价值的信息源,也对软件重用技术产生了重大的影响。其跨平台、分布式的特点为软件重用的应用实践活动开辟了广阔的前景。文中提出了在WWW上开发软件重用环境的思想,并由此设计了DSSRE系统。该系统基于SSRE,并了一个分布式、面向对象的支持软件重用的开发环境。     

基于设计模式的软件重用

针对软件重用。提出应用设计模式来记录软件设计知识。这可以使软件重用从构架重用提高到软件开发各阶段知识的重用。此外结合通用仓库／销售系统的实际对设计模式的用法进行了讨论。     

基于PowerBuilder的软件重用研究

研究了基于PowerBuilder软件的重用技术,通过PowerBuilder对象重用、全局函数重用和外部对象重用这三个方面实现软件重用,应用PowerBuilder软件重用技术能提高软件开发效率,设计出高质量、低成本的软件系统。     

基于类比推理的软件重用

类比推理在软件重用和程序综合中得到了广泛的应用。本文提出了一种基于软件相似的类比推理方法，详细讨论了软件重用过程中类比推理的两个重要环节：结构匹配和参数代换。最后，我们给出了该方法在信息系统开发中的应用。     

基于对象的软件重用技术研究

讨论了基于对象的可重用软部件的重用技术，给出了可重用软部件模型的定义，提出了分层次的目录结构的组织方式及两种检索途径，阐述了软部件的生成方法及重用机制。     

软件重用研究与应用

一、技术问题研究 九十年代,软件重用的潜力日益为人们所接受。软件重用的研究方向发生了根本性变化,人们不仅研究技术问题,而且开始研究非技术问题,如管理问题,资金问等等。 软件重用的研究状况如图1所示。 技术问题是软件重用研究的基础和核心,它涉及域分析和领域工程,软部件工程以及软部件可重用性等方面的研究。 1．领域分析和领域工(DA&DE) 领域分析(DA)是在软件开发过程中对应用领域信息进行收集、抽象和组织,识别和造出各种可重     

软件重用技术研究

目前软件重用技术已经成为内容非常广泛的研究领域,是当今软件工程领域中的一个研究热点。文中重点论述了目前研究得较多且应用较广泛的基于构件的软件重用技术,指出目前软件重用技术中存在的带有普遍性的问题,针对一些流行的关于软件重用的模糊、错误的认识进行了分析,并提出一些观点。     

A model for software reuse

Software reusability is widely believed to be a key to help overcome the ongoing software crisis by improving software productivity and quality. New computer technology and the demands of an advancing society require new and more complicated software. It is unrealistic to expect that every software system can be developed solely reusing existing software; however, software reusability has proven to be a way of enhancing software productivity and quality in different organizations. It is also believed that reuse of code segments alone does not significantly reduce software development effort.By creating reuse support information while software is being developed (when the software is best known to software developers), the reuse effort for both software development and maintenance can be potentially reduced.In this paper, five types of RSI are presented: Semantic Web, Horizontal Web, Vertical Web, Syntactic Web, and Alternative Web. We collectively call these five webs a Quintet Web. The Semantic Web enables software developers to locate a software segment. The Horizontal Web provides a means to reuse a block of soflware along with other types of software from other phases of a development process. The inter-phase integration of software can be performed through this Web. The Vertical Web identifies the vertical relationship of a software block to its operational environment. The Syntactic Web locates all statements in which a variable is used. The Alternative Web provides alternative software blocks that perform an identical operation.A prototype of the Quintet Web is presented.     

软件复用经济学模型比较分析

说明了软件复用经济学模型的主要目的和任务,对目前国际上提出的12个模型进行了比较分析。将复用经济学模型划分为两类：成本收益模型和投资分析模型,并举例介绍了相关类型的模型。对分析的所有模型列表比较,分析了它们的适用情况和异同点,并对领域存在的问题进行了讨论。     

A domain-independent software reuse framework based on a hierarchical thesaurus

Software reuse is an effective way to improve software productivity and quality. Software libraries are getting bigger, while most of them, such as those for object-oriented languages, use simple but somewhat ineffective classification methods. These libraries typically provide search aids for novices, but not for experts. They are not flexible enough to adequately serve users with different abilities. In this paper, a Software Reuse Framework (SRF) for overcoming these drawbacks is proposed. Based on a built-in hierarchical thesaurus, the classification process can be made semi-automatic. SRF is a domain-independent framework that can be adapted to various libraries. SRF also provides four search levels to serve users with different skill levels. Two sample SRF systems are implemented, one for Smalltalk-80 and the other for MFC 4.0 (Microsoft® Foundation Class) libraries. © 1998 John Wiley & Sons, Ltd.     

The impact of software evolution and reuse on software quality

This paper presents a case study of a software project in the maintenance phase. The case study was based on a sample of modules, representing about 1.3 million lines of code, from a very large telecommunications system. Software quality models were developed to predict the number of faults expected from the coding through operations phases. Since modules from the prior release were often reused to develop a new release, one model incorporated reuse data as additional independent variables. We compare this model's performance to a similar model without reuse data.Software quality models often have product metrics as the only input data for predicting quality. There is an implicit assumption that all the modules have had a similar development history, so that product attributes are the primary drivers of different quality levels. Reuse of software as components and software evolution do not fit this assumption very well, and consequently, traditional models for such environments may not have adequate accuracy. Focusing on the software maintenance phase, this study demonstrated that reuse data can significantly improve the predictive accuracy of software quality models.     

VB环境下基于类的软件复用技术研究

为提高VB环境下软件开发的效率,研究了软件复用技术,提出了以代码组件为核心的软件复用工程化思想.结合具体应用,详细介绍了VB中类的创建、复用方法,以及基于类的ActiveXDLL代码组件复用技术,同时还对VB中常用的其它代码组件的复用方法进行了简单介绍.研究结果表明,合理利用相关的软件复用技术,可以缩短软件的开发周期,提高软件的开发质量.     

基于构件的软件复用技术研究及在MIS中的应用

阐述了基于构件的软件复用技术,并就基于构件软件开发技术在管理信息系统（MIS）中的应用作了探讨,对提高软件开发效率有着重要意义。     

Three empirical studies of a software reuse reference model

The contribution of this paper is a reference model for the practice of software reuse. Our research thesis is that software development based upon a software reuse reference model improves quality of products, productivity of processes and product time‐to‐market for many software development enterprises. The definition and investigation of such a model has been carried out using three steps. First, the reference model is developed based on existing software reuse concepts. Second, this reference model is empirically studied using both legacy studies and lessons learned studies. Third, the impact of the reference model on software development productivity, quality, and time‐to‐market is empirically derived. Copyright © 2000 John Wiley & Sons, Ltd.     

分布式体系下组件库检索系统的设计与实现

研究了一个分布式的模块化的组件库系统的组件分类、管理和检索方案的设计与实现.提出了一个以新型组件库概念模型为基础的具有层次风格的组件库检索管理系统模型——CDIX-Ⅰ,并对CDIX-Ⅰ模型进行了详细的讨论.实践表明,在CDIX-Ⅰ模型指导下开发的CDIX-Ⅰ系统在速度、稳定性和安全性方面都能很好地满足用户的需要.     

两阶段过程模型下的产品线复用策略优化

考虑了软件产品线工程中各软件模块复用策略的选择问题. 在建立软件产品线开发两阶段过程模型的基础上, 归纳出6种典型的复用策略及其实现方式, 提出考虑开发成本、工时、故障率的情况下进行复用策略的选择优化模型, 解决在满足可获得预算、开发周期、系统可靠性需求的约束下产品线质量最优问题. 并基于贝叶斯理论构建易测试函数, 为产品线开发中领域测试强度的估算提供了方法. 最后, 以邮箱服务系统为实例说明该模型的有效 性.