C／S遗留系统到SOA系统移植框架研究

遗留系统在组织中起着重要的作用。随着商业环境的快速变化，应该不断用新技术对其进行进化。Web Service和面向服务的体系结构（SOA）使我们能在面向服务的计算环境中进化遗留系统。用web Service技术集成遗留系统的传统方法是将遗留系统包装成“黑盒子”。本文提出了一种再工程方法，该方法将遗留系统的包装和理解相结合。该方法不仅能对服务进行识别和包装，还可以将遗留系统移植到SOA的体系结构中。     

基于SOA的系统移植框架研究

遗留系统在组织中起着重要的作用。随着商业环境的快速变化,应该不断用新技术对其进行进化。SOA作为近年来最热门的软件开发方法和软件架构模式,理所当然成为了系统移植主要目标。提出了一个基于SOA的系统移植框架。该框架不仅能对服务进行识别和包装,还可以将遗留系统移植到SOA的体系结构中。     

基于SCA的分布式Web应用研究

针对传统的企业级分布式应用体系结构中由于平台和技术独立而存在的紧耦合、互操作性及重用性差等问题,深入理解了面向服务的体系结构(service oriented architecture,SOA)的特点,分析了SOA的最佳实现方式服务组件架构(servicecomponent architecture,SCA)的优势,在Java EE平台上构建基于SCA的分布式Web应用系统,重点介绍了SCA与Spring整合原理,并结合企业信息管理系统的应用实例,给出了该方案的实现技术。实验结果表明,该架构能很好地分离应用的业务逻辑和IT逻辑,具有易于构建、更改和部署等优势。     

基于面向服务架构的遗留系统再设计方法

提出了一种遗留系统再设计的方法,应用改进的层次聚类算法构建遗留代码,能够方便地将代码取出以构建Web服务.该方法支持服务鉴别和服务包装,通过改造有用的遗留代码,经济有效地将遗留系统迁移到面向服务架构中.最后利用上述技术,成功地再现了一个分布式并行计算平台的再设计过程.     

DDS在SCA系统中的应用

针对基于软件通信体系结构(SCA)的通信系统存在着实时性不高、冗余度较大、无法故障恢复等不足,将数据分发服务(DDS)技术引入到SCA架构中,形成了一种扩展方案.在完全保持SCA规范兼容的前提下,用DDS作为波形组件间的传输手段,有效地提高了基于SCA的通信系统的实时性,降低了系统的冗余度,实现了单个软件模块的动态重构.此方案已经在某仿真通信系统中得到了成功的应用.     

对遗留系统的Web服务封装

文章对面向服务体系结构(SOA)和Web服务进行了分析,针对当前存在的各种遗留系统,提出了将它们进行Web服务封装的设计与实现方法.该方法充分考虑了遗留系统多语言、多平台的特点,并针对特定系统(linux/unix环境下采用c/c 语言开发)提出了解决方法,能有效的对遗留系统进行基于SOA的Web服务封装.     

对遗留系统的Web服务封装

文章对面向服务体系结构（SOA）和Web服务进行了分析,针对当前存在的各种遗留系统,提出了将它们进行Web服务封装的设计与实现方法。该方法充分考虑了遗留系统多语言、多平台的特点,并针对特定系统（linux/unix环境下采用c/c＋＋语言开发）提出了解决方法,能有效的对遗留系统进行基于SOA的Web服务封装。     

基于SCA的服务架构技术的研究

面向服务的架构(SOA)技术以其松耦合性和与平台、语言无关性在构建分布式企业应用系统时得到广泛推广。服务组件架构(SCA)是跟实现语言无关的组件模型,可以简化基于SOA架构的业务的创建和集成。介绍了SCA编程模型的概念、特点、框架结构,并在此基础上提出了用SCA组件模型实现和调用Web服务。这一技术恰恰是SOA架构中所需要的。     

基于业务服务的企业遗留系统集成框架

企业应用集成(EAI)是当前企业进行业务扩展的一项主要技术,基于SOA实现EAI面临着一个重要的问题,如何将遗留系统无缝地连接到不断变化的新业务需求中.利用面向服务的架构来解决企业遗留系统应用集成.结合业务服务的概念和传统企业应用集成解决方案,讨论了基于业务服务的遗留系统应用集成框架,使用IBM平台对一个遗留销售系统集成案例进行了实现.     

遗留系统的服务挖掘方法

面向服务架构(Service-Oriented Architecture,SOA)正在成为快速开发企业级应用的标准,但是,现有的服务构建方法需要大量的人力和物力,将现有的组件功能重新用服务语言编写是低效和不必要的。从遗留系统中发现和挖掘可用组件并复用成Web服务,可以大大加快SOA的架构速度,减少开发成本。此方法通过逆向工程技术,从遗留系统中挖掘出可用服务。     

基于SOA技术的教学管理系统研究

针对当前一般学校教学管理的现状,以及对教学管理系统的需求,从分析面向服务的软件架构相关技术入手,结合网络教育技术,提出一种基于面向服务体系结构框架下的教学管理系统模型,旨在为教学职能部门提供一种实现网络信息化管理的新模式,以期通过信息化手段提高管理水平和工作效率。     

A service composition approach based on sequence mining for migrating e-learning legacy system to SOA

With the fast development of business logic and information technology, today's best solutions are tomorrow's legacy systems. In China, the situation in the education domain follows the same path. Currently, there exists a number of e-learning legacy assets with accumulated practical business experience, such as program resource, usage behaviour data resource, and so on. In order to use these legacy assets adequately and efficiently, we should not only utilize the explicit assets but also discover the hidden assets. The usage behaviour data resource is the set of practical operation sequences requested by all users. The hidden patterns in this data resource will provide users' practical experiences, which can benefit the service composition in service-oriented architecture (SOA) migration. Namely, these discovered patterns will be the candidate composite services (coarse-grained) in SOA systems. Although data mining techniques have been used for software engineering tasks, little is known about how they can be used for service composition of migrating an e-learning legacy system (MELS) to SOA. In this paper, we propose a service composition approach based on sequence mining techniques for MELS. Composite services found by this approach will be the complementation of business logic analysis results of MELS. The core of this approach is to develop an appropriate sequence mining algorithm for mining related data collected from an e-learning legacy system. According to the features of execution trace data on usage behaviour from this e-learning legacy system and needs of further pattern analysis, we propose a sequential mining algorithm to mine this kind of data of the legacy system. For validation, this approach has been applied to the corresponding real data, which was collected from the e-learning legacy system; meanwhile, some investigation questionnaires were set up to collect satisfaction data. The investigation result is 90% the same with the result obtained through our approach.     

一个具有服务质量保障的面向服务的网格模型

为了在面向服务的网格系统中提供服务质量（QoS）支持，本文较深入地研究了OGSA及Web Service等相关理论和技术．基于面向服务的体系结构，提出了一个具有QoS保障的面向服务的网格系统模型SoGSM—QoS．该模型通过物理网格节点的联合，来消除管理上的冗余并简化网格系统结构．模型支持虚拟组织和资源虚拟化，在各层次间提供用户QoS需求的映射和监控，保障用户的QoS．本文详细阐述了模型的结构、功能和访问控制机制，并建立了相应的过程模型．分析了有关性能，验证了模型的有效性．     

基于SCA的SHP组件动态部署方案

在软件通信体系结构(SCA)中,调制解调级硬件抽象层(MHAL)规范不支持专用硬件处理器(SHP)中组件的动态部署。为此,提出一种基于SCA的SHP组件动态部署方案。介绍MHAL通信机制,设计硬件装配描述文件和硬件组件描述文件,在此基础上实现动态部署。分析结果表明,该方案能实现波形开发和部署阶段软件与硬件的分离,增强SCA对SHP的兼容性。     

Component meets service: what does the mongrel look like?

Computing with services has attracted much attention as a promising approach for developing distributed applications. The approach is often advertised as being superior to distributed component-based software engineering (CBSE), because it provides a higher potential to bridge heterogeneous IT application and infrastructure landscapes. It facilitates cross-institutional cooperation, lets services run over all kinds of ubiquitous communication infrastructure, scales better and simplifies legacy software integration. If this were absolutely true, there would be no reason for a consortium of major vendors of service and Java EE technology to come up with a new specification, called service component architecture (SCA). This emerging standard tries to leverage service-oriented architecture (SOA) principles with component-based software development techniques. In this article we discuss some commonalities and fundamental differences of the CBS and SOA worlds. We illustrate SCA briefly using snippets of an ongoing case study based on an e-university federation. Then we elaborate on the qualities and current deficits of SCA in the light of CBSE findings and related works.     

SCA波形组件的可视化装配与部署

针对软件通信结构(SCA)规范中XML配置文件在可视化表示波形组件描述和波形应用装配与部署方面的不足,提出SCA波形组件的可视化装配与部署,为SCA兼容系统的架构设计者和系统开发者提供了一种图形化的装配逻辑和部署关系表示方式,减少了系统设计和开发过程中可能出现的错误。并对SCA规范中的组件间端口连接方式进行了归纳和总结,给出在不同应用场景下选择端口连接方式的原则,介绍了一种基于Eclipse体系框架的SCA波形集成开发环境。     

From objects to services: toward a stepwise migration approach for Java applications

Migrating legacy applications toward service-oriented systems is a hard task complicated by the lack of appropriate approaches and tools. In this paper, a stepwise approach is proposed to migrate a Java application into an equivalent application composed of a set of Web services invoked by an orchestrator. In each migration step, a portion of the target application is identified and migrated into a Web service. In this approach, the role of testing is central since after each migration step the new service-oriented application is tested with the aim of checking “its equivalence” with the original version. An experiment based on four Java applications has been conducted to tune the approach and evaluate applicability and effort involved in the migration process. The obtained results confirm the viability of the proposed approach and highlight some encountered SOA migration difficulties.     

基于SCA/SDO的高速铁路综合调度系统中间件设计

为了解决高速铁路综合调度系统在高度分布、高度异构环境下的系统集成问题,提出了基于面向服务架构(SOA)的系统集成架构。基于服务组件架构/服务数据对象(SCA/SDO)技术构建了高速铁路综合调度系统的体系结构及分布式SOA应用,在Java EE平台上基于SCA/SDO技术实现了供电调度子系统与其他子系统集成,所采用的方法充分体现了SOA的开放性和跨平台等特性,并且实现简单。