Automatic Distribution Composition and Maintenance of Software Components via Mobile Agents

虽然近年来信息技术的发展提高了对信息处理系统的需求，但其引进、维护和运行的成本变得非常高。有时成本如此之高，以至于中小型企业即使迫切需要，也负担不起引进系统的费用。同时，一部分商业交易已经实现了计算机化，紧急的计算机化是企业生存的关键。由于这些原因，构建一个软件开发环境和软件分发的基础结构被赋予了最高的优先权，这将减少系统的构建和维护的成本。这个项目提出了一个叫做GISEN （General Integrated Software Environment for Nexus）的系统。GISEN的目标是实现“服务无处不在”的理念；也就是说，每个人都可以利用同样的服务，而不管他/她在哪里，服务被最大化地适应每个用户的环境。这个项目的最终目标是建立提供这样一个信息系统的措施。我们系统的特点可以概括如下。面向资源的应用程序：裸应用程序（XAD）的实现同时完成了针对某些资源集的完整应用程序的开发，只要有专门用于这些资源的组件可用。这一特性使得为不同类型的终端提供服务变得容易得多；从而扩大了服务范围，同时提高了开发效率。易于应用程序管理：在我们的系统中，对应用程序的请求触发了适合客户端资源的必要组件的下载。通过应用该机制，系统可以实现应用组件的简单版本升级。当应用程序中的某些组件升级时，可以通过用新组件替换旧组件来轻松地重建应用程序。上述特性具有以下效果。我们的系统降低了包括业务系统在内的各种Web应用程序（网络应用程序）的开发成本。近年来，各个业务领域对IT系统的需求日益增长。系统开发需求的增长必然会推动开发人员对开发环境的需求，从而承担系统开发。与此同时，更多基于组件的应用程序将出现在市场上，销售组件的公司数量也将相应增加。本系统实现了组件分发，在软件组件较多的情况下，可作为高效应用分发的基础设施。我们的系统的市场扩展到整个软件行业。少

Although the recent development of information technology has raised the need for information processing systems, the cost of their introduction, maintenance and operation becomes extremely high. The cost is sometimes so high that small and medium companies cannot afford to introduce a system even though they desperately need it. At the same time, a part of business transactions have already been computerized and urgent computerization is a key to the survival in the business. For these reasons, it is being given the top priority to construct a software development environment and an infrastructure for software distribution that would cut the cost of the construction and maintenance of he system.This project proposed a system called GISEN (General Integrated Software Environment for Nexus). The goal of the GISEN is to realize the concept of "Service Anywhere" ; that is, everyone can take advantage of the same service irrespective of where he/she is, and the service is maximized to fit … More in with each user's environment. The final goal of this project is to establish measures to offer such an information system.The features of our system can be summarized as follows.Resource-oriented applications : The implementation of a bare application (XAD) simultaneously completes the development of a full application for certain sets of resources as far as the components specialized for the resources are available. This feature makes it a lot easier to offer services for different kinds of terminals ; consequently, it enhances the range of services and, at the same time, improves the development efficiency.Easy application management : In our system, a request for an application triggers the download of the necessary components that fits the client resources. By applying this mechanism, the system can realize an easy version-up of application components. When some components in an application are upgraded, the application can easily be reconstructed by substituting the new components for the old ones.The above features have the following effects. Our system leads to cutting down the development cost of various Web applications (network applications) including business systems. Recently, the demand for IT systems is increasingly rising in various business fields. The rise of the demand for system development will surely push up the demand for development environment on the side of the developers to take on the system development. At the same time, much more component-based applications will appear on the market and the number of companies selling components will increase accordingly. Our system has realized component distribution, and it can be an infrastructure for efficient application distribution when more software components are circulated. The market of our system extends to the whole software business. Less