【摘要】 提出了基于移动Agent的分布式地理信息查询的新思路 ,给出了构建基于移动Agent的分布式地理信息查询系统的方法 ,并利用移动Agent开发平台Aglets开发了一个分布式地理信息查询原型系统 ,实现了分布式地理信息的透明访问。更多还原

【Abstract】 As a recently developed paradigm in distributed computing,mobile agent can especially benefit (mobile) Internet applications on providing asynchronous task execution and more dynamics,supporting flexible and extensible cooperation,reducing communication bandwidth,enhancing real time abilities and higher degree of robustness,enabling off_line processing and disconnected operation.This paper presents an approach based on mobile agent to query distributed geographic information,which can overcome the drawbacks of the traditional connection_based access method.A prototype is implemented to access distributed geographic information transparently by using Aglets,which is a free mobile agent development platform developed by IBM.In our on_going research project,mobile agents are responsible for remote information retrieval.A user submits spatial or nonspatial query through a GUI interface built at the client machine,and the query is analyzed and decomposed at a server site.Then some mobile agents are created and dispatched to the respective sites to retrieve data autonomously and separately.Distributed GIS based on mobile agent is more adaptable to the open,heterogeneous,autonomous (mobile) Internet with limited bandwidth and unstable communication connectivity.更多还原