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题名:
服务发现机制的设计与实现
作者: 张发恩
答辩日期: 2008-06-07
授予单位: 中国科学院软件研究所
授予地点: 软件研究所
学位: 博士
关键词: 服务发现机制 ; 服务摘要 ; 分布式后缀树索引 ; 内容寻址 ; 虚拟环状空间
其他题名: Design and Implementation of Service Discovery Mechanisms
摘要: 随着网络的普及和各类设备的智能化、移动化,普遍互联和动态移动构成了当前计算环境的主要特征。服务发现协议帮助用户在各类分布式环境下找到所需的服务,即,存在于网络中,可以被发布、发现和使用的任何软件或硬件资源。服务发现是网络分布式环境下进行信息共享、数据集成、流程协作的前提,更是普适计算环境的基础设施。 学术界和工业界在服务发现方面已经进行了不少的探索和研究,但是目前Internet/Intranet、MANET的规模越来越大,网络中的服务种类与数量剧增,适用于上述网络环境的服务发现系统应该具备高效、准确、低通信量和规模可伸缩的特性,另外,由于网络的动态性,系统需要具有一定的容错能力。针对于上述网络环境的服务发现研究相对较少且不成熟,还存在较多问题需要解决。 本文以服务描述模型SDMDHD为基础,针对于稠密部署的大规模MANET环境,设计了相应的服务发现机制,并在SCN4M(Service CatalogNet for MANET)系统中实现了该发现机制;针对于服务种类丰富、数量很大的大规模Internet/Intranet环境,设计了相应的服务发现机制,并将该机制实现在SCN4I(Service CatalogNet for Internet/Intranet)系统中。两个系统均对服务信息进行了摘要,并以服务信息的摘要为基础构建了分布式后缀树索引机制,它确保了高效、准确、低通信量的服务发现过程,从而使得系统具备规模可伸缩性。以索引机制为基础,两个系统提供了基于协作的选播/多播服务发现策略。针对网络动态性,两个系统均采用分布式信息冗余存储策略,一定程度上解决了节点失效引发的信息丢失问题。另外,SCN4M实现了基于内容寻址的应用层路由方案,SCN4I实现了虚拟环状空间中基于内容的消息转发机制,为解决节点动态加入和离开问题奠定了基础。
英文摘要: Computing networks are more widespread and computing devices are more intelligentlized and more portable than ever. Universal interconnecting and dynamic moving are the main characteristics of nowadays computing environments. Service discovery protocols help to discover expected services in distributed environments, where services could be in any form of software or hardware resources that could be advertised, discovered and invoked. Service discovery is the premise of the information sharing, data integration and process collaboration in the distributed environments. Service discovery systems are also infrastructures in pervasive computing environments. Over the past few years, many organizations have designed and developed service discovery protocols. However MANET and Internet/Intranet are moving to large scale, meantime service resources become more abundant and in diversified form. In such network environments, service discovery systems should be efficient, accurate, low message traffic and scalable. In addition, because of dynamic networks, the systems should be fault-tolerance to some extent. After investigating existing work, we find that the work aiming at services discovery for large scale dynamic networks involving amounts of services is still deficient, and there are still some issues needed to be solved. Based on service description model SDMDHD, aiming at large scale and dense MANET environments and large scale Internet/Intranet environments, we designed two corresponding service discovery mechanisms and implemented corresponding prototype systems named SCN4M (Service CatalogNet for MANET) and SCN4I (Service CatalogNet for Internet/Intranet). After extracting profiles for registered services, both systems adopt distributed suffix tree index mechanisms which ensure that service discovery is efficient, accurate, low message traffic and the whole system is scalable. Based on index mechanisms, SCN4M and SCN4I provide collaborative anycast/multicast discovering strategy. As far as dynamic is concerned, both systems manage resources in a distributed and redundant way and to some extent resolve information lost problem caused by node failure. In addition, SCN4M implemented content addressable overlay network and SCN4I implemented messages dispatching mechanism based on the content of messages in virtual circle-wise coordinate space which are foundation of resolving device’s dynamic joining and leaving problem.
语种: 中文
内容类型: 学位论文
URI标识: http://ir.iscas.ac.cn/handle/311060/7184
Appears in Collections:软件工程技术研究开发中心 _学位论文

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Recommended Citation:
张发恩. 服务发现机制的设计与实现[D]. 软件研究所. 中国科学院软件研究所. 2008-06-07.
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