一个基于SOA的大型分布式计算机辅助教学系统

传统的面向对象的软件开发方法所开发的应用系统通常与开发工具、宿主平台、操作系统紧密耦合，容易导致和形成所谓的“信息孤岛”。面向服务的体系结构（SOA）被认为是解决分布式环境中软件重用、互操作、提高软件开发效率的有效途径。本文以一个具体的计算机辅助教学管理系统—NWU-CMI为实例，研究了利用Web服务实现基于SOA的大型分布式软件系统的有效方法，同时，深入分析了采用SOA体系结构开发NWU-CMI系统的代码重用、系统结构、服务组装等关键实现技术。

RESEARCH AND IMPLEMENTATION OF A SOA BASED LARGE DISTRIBUTED COMPUTER-MANAGED INSTRUCTION SYSTEM

Applications developed by traditional Object-Oriented method are usually tightly coupled with the developing toolkits, the imbedded platforms, and the supporting operating systems. It, therefore, forms and leads to the so called isolated information island. A new software architecture and its developing approach, called as SOA(Service Oriented Architecture), is proposed recent years to overcome the problem, which aims especially at improving the reusability, interoperability, and efficiency in software development. In the paper, an effective method to implement a large SOA based distributed Computer-Managed Instruction system ( naming NWU-CMI) with Web Services is thoroughly investigated. Key issues, such as system architecture, functional reuse, and services composition of NWU-CMI are significantly discussed.