层次化网关转发的agent迁移技术与应用  

Hierarchically gateway forwarding based agent migration:Technology and application

作　　者：吴晓[1] 马骏[1] 陶先平[1] 吕建[1] 

机构地区：[1]南京大学计算机软件新技术国家重点实验室,南京大学计算机软件研究所,南京210093

出　　处：《南京大学学报（自然科学版）》2010年第2期169-178,共10页Journal of Nanjing University（Natural Science）

基　　金：国家“973”计划(2002CB312002);“863”计划(2007AA01Z178,2006AA01Z159);国家自然科学基金(60736015,60721002);江苏省自然科学基金(BK2006712)

摘　　要：随着互联网的日益普及,形式各样的网络应用层出不穷.移动agent计算模式是一种灵活的分布计算模式和程序设计风范,给网络应用的设计、实现和维护都带来了较大的灵活性.移动agent技术的推广和使用,要求agent能够在网络上任意节点之间迁移;但是由于Internet中存在大量的私有网络,且现阶段agent适移技术在支撑agent自由穿越各个私有网络方面存在不足,制约了基于移动agent的应用的普及.针对这一问题,本文提出了一个"层次化网关转发agent迁移方案".在该方案中,本文根据网络的拓扑结构提出了互联网络节点"层次化网络编址",并在此基础上给出了"地址解析/转发算法".此外,为了消除此方案对网关、代理服务器等关键节点的依赖,本文给出了基于"配对转发服务"的实现方案,在保证透明性的前提下完成逻辑上的网关功能,进一步增强"层次化网关转发agent迁移方案"的灵活性和实用性.最后,本文给出了基于此荐技术的一个"文件同步软件"应用实例实现.As the increasing popularity of the Internet, various sorts of network applications have continued to flourish. Mobile agent computing model is a nimble distributed computing model and programming paradigm. Mobile agent technology has brought greater flexibility to network application design, implementation and maintenance. The promotion and use of Mobile agent technology put forward requirements that agents can migrate between any nodes on the network. However, due to the existence of numerous private networks, as well as the deficiencies of agent passing through the private networks, the popularity of the applications based on mobile agent technology has been limited. To tackle this problem, we propose a ＂novel agent migration solution based on hierarchical gateway forwarding＂. In the solution, we present ＂ Hierarchical Network Address＂ for the interconnected nodes according to the network topology, and proposwe a ＂address resolution/forwarding algorithm＂. Moreover, in order to get rid of the dependence on gateways and proxies, we provide the implementation of ＂pairwise agent forwarding serivices＂, which can consummate logical gateway functions on the pi＇emise of ensuring the transparency and further enhance the flexibility and praciticality of ＂agent migration solution based on hierarchical gateway forwarding＂. As last, this paper illustrates a case study of the ＂File Sync Software＂ application.

关 键 词：移动agent迁移 层次化网络编址 网关转发 

分 类 号：TP393.09[自动化与计算机技术—计算机应用技术]