基于Web Service的一种分布式体系结构

基于Web Service的框架为电子商务提出了一种新的分布式体系结构，它可以跨越应用系统的对象体系、运行平台、开发语言等的界限，以服务的形式封装应用并对外发布，供用户或其它企业调用，从而形成一个其于Web的服务共享平台。从WebService的概念入手，详细介绍了Web Service框架的标准、组件结构及其发展动态，并对现有的产品进行了比较。     

一种基于OWL-S的Web服务体系结构

Web服务是一个新的分布式计算模型,是Web上数据和信息集成的有效机制。文中分析了当前Web服务体系结构,提出了一种基于OWL-S的Web服务体系结构,并给出在新型Web服务体系结构下的服务发现和调用机制,实现了Internet环境下的动态查找、合成和动态绑定,有效地支持Web服务的动态组合和协调。     

Managing Information for Effective Business Partner Relationships

Partner Relationship Management (PRM) is an information strategy that employs a set of applications focused on directly impacting an enterprise and its business partners' sales and services. Web services employ a distributed computing architecture that consists of many different computers that communicate over the Internet to form one system. the communication standards and protocols used in Web services are universally accepted. These Web services can be requested by client applications: Web based, windows, or mobile devices. This article presents an overview of PRM and Web services, and discusses the potential for improving partner relationship processes through the use of Web services.     

基于Web Services的政务信息共享平台

针对目前电子政务系统的新需求,基于Web Services技术提出了一种新的分布式电子政务平台构造方案,它可以跨越不同机构的应用体系、操作系统、开发语言等的界限,以服务的形式封装数据和应用并对外发布,供用户调用,从而形成一个基于Web的服务共享平台。文中从阐述Web Services的概念入手,详细介绍了所开发电子政务平台的架构、软件体系结构及系统拓扑结构,并给出了基于该平台的两种应用场景。     

METEOR-S WSDI: A Scalable P2P Infrastructure of Registries for Semantic Publication and Discovery of Web Services

Web services are the new paradigm for distributed computing. They have much to offer towards interoperability of applications and integration of large scale distributed systems. To make Web services accessible to users, service providers use Web service registries to publish them. Current infrastructure of registries requires replication of all Web service publications in all Universal Business Registries. Large growth in number of Web services as well as the growth in the number of registries would make this replication impractical. In addition, the current Web service discovery mechanism is inefficient, as it does not support discovery based on the capabilities of the services, leading to a lot of irrelevant matches. Semantic discovery or matching of services is a promising approach to address this challenge. In this paper, we present a scalable, high performance environment for Web service publication and discovery among multiple registries. This work uses an ontology-based approach to organize registries into domains, enabling domain based classification of all Web services. Each of these registries supports semantic publication and discovery of Web services. We believe that the semantic approach suggested in this paper will significantly improve Web service publication and discovery involving a large number of registries. This paper describes the implementation and architecture of the METEOR-S Web Service Discovery Infrastructure, which leverages peer-to-peer computing as a scalable solution.     

分布式对象在Web Services网络中的复用研究

Web Services网络是适用于异构和快速变化环境中的一种新型分布式计算模型。在研究分布式对象架构和Web服务架构的基础上，分析了分布式对象在Web服务网络中的复用原理，对分布式对象在Web Services网络中复用的基本问题进行了一些探讨，并用Java语言实现了简单DCOM对象和CORBA对象在Apache SOAP中的复用。     

基于WebService的WebGIS的设计与应用

基于WebGIS目前存在的一些不足,提出构建基于WebService的WebGIS系统,并说明这种系统的优势和特点。通过对正在开发的基于WebService的WebGIS系统的设计和一些已经完成的工作的介绍,来说明系统的可行性和先进性。     

Web服务测试问题综述

近来出现了一种新的支持分布式计算的范型--面向服务的体系结构(SOA).Web服务就是这种结构的具体实现形式之一.众所周知,为了获得一个可信的、可靠的服务,对服务实施完全、充分的测试是至关重要的.所以本文对Web服务的测试方法和技术进行了调查研究.本文从SOA体系结构下Web服务的特点及其测试的新的挑战出发,讨论了Web服务测试与传统测试的不同点;接着从多个不同的角度(测试的视角和测试的策略)讨论了Web服务测试的相关问题.然后给出了一个Web服务测试过程的组织框架,还讨论了目前Web服务测试的研究现状和一些代表性的Web服务测试技术.最后总结全文并给出未来的研究方向.     

Web Services:分布式网络体系新架构

Web服务作为一种新型的分布式网络体系架构成为目前研究的热点。该文从分布式计算技术与Grid计算和XML等技术发展融合的角度分析了Web服务发展历程和概念定义。提出了一种RSRPM新的Web Services架构模型和形式化定义，并对实现时所需要采用的核心步骤、指令方法以及核心协议栈进行了分析和描述。另外，在对目前Web服务的应用情况进行分析的基础上，指出了Web服务存在的局限性、4个主要的技术问题以及未来的发展趋势。     

Supporting dynamic access to virtualized data resources via WSRF-based services

Today grid applications require not only lots of computational power but data at a very large scale too. Although grid computing was initially conceptualized as the technology that focuses on solving compute-intensive problems, this focus has gradually shifted to applications where data is distributed over various locations. Access to these data resources stored in heterogeneous grid storage systems located at geographically distributed virtual organizations in an integrated and uniform way is a challenging problem. The Web Services Resource Framework (WSRF) has recently emerged as the standard for the development and integration of grid services. This paper proposes and presents Gravy4WS, a middleware architecture based on WSRF Web services that enables the dynamic access to virtualized grid data resources. A novel scheduling algorithm called DCE (Delegating-Cluster-Execution based Scheduling) is proposed to improve load balancing of the system. The implementation of Gravy4WS using WSRF libraries and services provided by Globus Toolkit 4 is described together with its performance evaluation.     

基于Web服务的网格体系结构及其支撑环境研究

网格技术是当前网络计算的前沿领域,基于Web服务技术构建网格系统有助于提高网格系统的可扩展性和互操作能力,是这一领域中的最新热点.但现有的工作尚未明确界定基于Web服务的网格的功能模型和实现机制.首先讨论了网格功能模型,基于OGSA(open grid service architecture)框架提出了基于Web服务的网格层次体系结构,并将Web服务工作流引入到网格任务描述中,给出一种Web服务与网格技术相融合的机制,介绍了基于Web服务的网格支撑环境WebSASE4G的总体结构和设计原理,为基于Web     

基于RM—ODP模型的G—WebService的设计

Web Service,as a new standard framework for distributed computing,is to solve the existing problem of cross-platform communication and collaboration between distributed applications. Evolving from the Web Service ar-chitecture ,G-WebService framework, which is the definite substitute of WebGIS, will change the existing spatial infor-mation applications into geo-services. This paper first introduces the Web Service concept and the related standards,and then discusses the G-WebService architecture and implementation from five viewpoints,which is based on RM-ODP.     

基于Web Services的学籍管理系统的设计与实现

作为分布式计算的下一代产品.Web Services技术具有平台独立性和语言独立性特点.解决了传统分布式计算技术难以解决的问题--异源应用程序之间的相互操作性.介绍Web Services的体系结构和关键技术.设计并实现了一个基于Web Services的学籍管理系.     

Services computing: grid applications for today

The coming generation of Internet applications promises to incorporate a distinctly different view of software, one based on services. Services computing is the evolution of Internet computing toward a services-oriented architecture. By service oriented, we mean that business will purchase functionality in chunks. Rather than buying software for permanent in-house installation, companies will buy services as needed. A services model removes the burden of updates and patches from the IT department, returning such work to its rightful owners: the vensors that sell the software. To support such a scenario, an architecture must embrace a new technology suite that includes Web services and a service-oriented architecture for grid and utility computing, and autonomic computing.     

Web services are not distributed objects

Web services are frequently described as the latest incarnation of distributed object technology. This misconception, perpetuated by people from both industry and academia, seriously limits broader acceptance of the true Web services architecture. Although the architects of many distributed and Internet systems have been vocal about the differences between Web services and distributed objects, dispelling the myth that they are closely related appears difficult. Many believe that Web services is a distributed systems technology that relies on some form of distributed object technology. Unfortunately, this is not the only common misconception about Web services. We seek to clarify several widely held beliefs about the technology that are partially or completely wrong. Within the distributed technology world, it is probably more appropriate to associate Web services with messaging technologies because they share a common architectural view, although they address different application types. Web services technology will have a dramatic enabling effect on worldwide interoperable distributed computing once everyone recognizes that Web services are about interoperable document-centric computing, not distributed objects.     

Distributed data mining patterns and services: an architecture and experiments

Distributed data mining implements techniques for analyzing data on distributed computing systems by exploiting data distribution and parallel algorithms. The grid is a computing infrastructure for implementing distributed high‐performance applications and solving complex problems, offering effective support to the implementation and use of data mining and knowledge discovery systems. The Web Services Resource Framework has become the standard for the implementation of grid services and applications, and it can be exploited for developing high‐level services for distributed data mining applications. This paper describes how distributed data mining patterns, such as collective learning, ensemble learning, and meta‐learning models, can be implemented as Web Services Resource Framework mining services by exploiting the grid infrastructure. The goal of this work was to design a distributed architectural model that can be exploited for different distributed mining patterns deployed as grid services for the analysis of dispersed data sources. In order to validate such an approach, we presented also the implementation of two clustering algorithms on the developed architecture. In particular, the distributed k‐means and distributed expectation maximization were exploited as pilot examples to show the suitability of the implemented service‐oriented framework. An extensive evaluation of its performance was provided. Copyright © 2011 John Wiley & Sons, Ltd.     

网格计算环境下的ASP服务模型

随着新技术的不断涌现以及企业对于商业应用服务的需求，人们对ASP服务模型的探讨又活跃了起来。本文比较了网格环境下的P2P，web服务等技术，指出了web服务技术能将各种分布的、异构的、由单一企业提供或者由各外部共享资源和应用服务提供商联合提供的动态服务整合起来的特性，并分析了ASP的演化将由传统的一对多模式转向web服务的趋势。最后结合具体的科研项目，提出了一种通用的ASP服务模型，还探讨了它在实际应用中的价值。     

网格计算环境下的ASP服务模型

随着新技术的不断涌现及企业对商业应用服务的需求目的，对ASP服务模型的探讨又活跃起来。采用技术对比的方法分析了网格环境下的P2P和web服务技术，指出了web服务技术能将各种分布的、异构的、由单一企业提供或者由各外部共享资源和应用服务提供商联合提供的动态服务整合起来的特性，得出了ASP的演化将由传统的一对多模式转向web服务的结论。最后结合具体的科研项目，提出了一种通用的ASP服务模型，还探讨了它在实际应用中的价值。     

基于SOAP构建Axis上的Web Services

Web Services是一种在Internet上进行分布式计算的新思路,它引出了新一代的企业应用集成(Enterprise Application Integration,EAI)的发展.首先分析了传统中间件技术在异构系统集成中所遇到的一些问题,然后介绍了Web Services的体系结构和优点,并在此基础上介绍了Apache Axis框架的组成部分、体系结构以及其处理SOAP消息的流程,并用实例阐述了如何利用Apache Axis开发和使用一个Web Services的全过程.     

一种高效的Web服务性能优化策略

Web服务是构建面向服务架构(SOA)的主流分布式计算技术.基于XML的数据传输格式在给Web服务带来众多优点的同时,严重影响了其性能,制约了Web服务的应用.众多研究表明,XML解析和数据绑定是Web服务的主要性能瓶颈.着眼于避免传统XML解析和运行时Java反射过程的开销,提出了一种新颖的Web服务性能优化策略.它为每个Web服务生成一个特定于该服务的SOAP消息处理器,通过在对SOAP消息的一遍扫描中高效地生成服务业务逻辑调用所需的参数对象.实验结果表明,该优化策略能够有效地提高Web服务的性能.