基于结构化P2P网络的CORBA交易服务

DHT-based Trading Object Service Architecture

交易服务能够在分布式环境下为用户提供发现网络中服务的能力。文章提出了一种在CORBA环境下基于结构化P2P网络的交易服务结构(DHT-Trader),该体系结构不仅具有结构化P2P网络的可扩展性和健壮性,还支持类型相关查询,包括基于属性查询和语义查询。文章着重分析了类型相关查询和语义查询的难点,提出了在结构化P2P网络中实现类型相关查询和语义查询的解决方案。通过使用DHT-Trader,出口者可以为一个服务发布若干名字,进口者仅根据其中之一就可以得到服务以及该服务类型的所有子类型。

A trader or a trading object provides the ability to discover instances offered in a distributed system. This paper proposes a DHT based Trading Service （DHT-Trader） Architecture in a CORBA environment which not only takes advantage of the scalability and robustness of a DHT but also supports type related, attribute based and semantic queries. Difficulties of type related query and semantic query are manifested and further DHT-based solutions are put forward. By using DHT-trader, an exporter can publish several service names by which an importer can retrieve service instances. Besides, an importer can get all the sub-class instances of a specified service.