端到端的Web Service服务质量建模与仿真研究

融合BPM和SOA的技术架构受到业界越来越多的关注,Web Services是实现架构的主要技术手段.当前对Web Serv-ices服务质量的研究主要集中在对非功能性的、通用的QoS属性和算法上,很少涉及领域相关的Qos属性和端到端的WebService服务质量模型.提出了一个基于业务流程的端到端的Web Services QoS模犁框架,包括业务流程子模型、QoS属性子模型、QoS度量指标子模型、端到端的QoS度量指标子模型、端到端的QoS仿真计算子模型和端到端的多目标选择策略子模型等六部分.并介绍了实现模型的仿真平台的主要构成和基奉功能.最后给出的一个具体示例表明,模型为企业组织的业务流程优化提供了决策支持.     

Simulation-based experimentation for designing reliable and efficient Web service orchestrations in supply chains

The world today is witnessing a growing interest in conducting supply chain business processes electronically using Web services orchestration technology. Fast adoption is often hampered by the need for experimentation to make efficient use of this technology in supply chain processes. In this paper, a simulation-based approach supporting experimentation with the efficiency and reliability of Web service orchestrations in supply chains prior to implementation are presented. The approach simulates the de facto business process specification standard for Web services, BPEL4WS, using Java-based simulation building blocks. A supply chain case study is used to demonstrate and evaluate the approach.     

XML-Based Advanced UDDI Search Mechanism for B2B Integration

Exploring appropriate business applications published as Web Services in UDDI registries is a critical issue. Search for such applications should be effective in terms of time and uniformed in terms of interfaces. In this paper, an XML-based advanced UDDI exploring engine, Business Explorer for Web Services (BE4WS), that provides developers with standard interfaces for efficiently searching business and service information in single or multiple UDDI registries is presented. The engine processes the proposed UDDI Search Markup Language (USML) that specifies a search request comprising multiple queries, UDDI sources, search criteria, and aggregation operator. The core component of BE4WS, Advanced UDDI Search Engine (AUSE), aggregates search results from different UDDI registries based on the USML request and built-in intelligent search facilities with the ability to cross-reference multiple categories. An aggregation example using BE4WS is demonstrated to enable easy B2B integration.     

基于UDDI的应用服务注册中心的设计

服务注册与发现技术是当前企业级应用集成系统研究的热点.基于统一表述、发现和集成(UDDI)协议的应用服务注册系统是面向服务软件体系结构的重要组件,其目的是促进企业间的服务资源共享,以及企业间跨越互联网的业务整合,UDDI协议包括服务注册系统程序接口规范和数据结构规范.应用服务注册系统采用.NET平台下的C#语言开发,适用于在线web服务交易.为了确保信息的可靠性,系统对UDDI协议作了扩展,提供了对将要发布的信息的审批机制和基于角色的用户管理.     

基于SOA的数据同步技术研究与实现

随着企业或单位业务系统建设数量与复杂程度的增加,其产生的数据种类与日俱增,由于建设规范与标准不一,数据的共享成为一大问题。利用基于SOAXML、Web Service、UDDI等核心技术,实现了数据同步的实时性、松耦合性、可扩展性等要求,为不同业务系统的异构数据的共享提供了一个通用的交换平台。     

一种基于多Agent的Web服务有效发现方法

在系统地讨论Web服务与Agent概念的基础上,提出了将一个Agent描述成一个Web服务,并通过UDDI发现该服务而将Agent和Web服务集成在一起的实验方案。在该基础上,设计了一个基于多Agent和语义驱动的Web服务有效发现中间件平台,重点对其组件、功能和交互过程进行了全方位描述。最后,通过一个运行实例的Web服务智能发现过程,展示了该方法是可行和有效的。     

A semantical framework to engineering WSBPEL processes

Web services promise the interoperability of various applications running on heterogeneous platforms over the Internet, and are gaining more and more attention. Web service composition refers to the process of combining Web services to provide value-added services, which has received much interest in supporting enterprize application integration. Industry standards for Web Service composition, such as WSBPEL, provide the notation and additional control mechanisms for the execution of business processes in Web service collaborations. However, these standards do not provide support for checking interesting properties related to Web Service and process behavior. In an attempt to fill this gap, we describe a formalization of WSBPEL business processes, that adds communications semantics to the specifications of interacting Web services, and uses a formal logic to model their dynamic behavior, which enables their formal analysis and the inference of relevant properties of the systems being built.     

From business to software: a B2B survey

In recent years business-to-business (B2B) e-commerce has been subject to major rethinking. A paradigm shift can be observed from document centric file-based interchange of business information to process-centric and, finally to service-based information exchange. On a business level, a lot of work has been done to capture business models and collaborative business processes of an enterprise; further initiatives address the identification of customer services and the formalization of business service level agreements (SLA). On a lower, i.e., technical level, the focus is on moving towards service-oriented architectures (SOA). These developments promise more flexibility, a market entry at lower costs and an easier IT-alignment to changing market conditions. This explains the overwhelming quantity of specifications and approaches targeting the area of B2B—these approaches are partly competing and overlapping. In this paper we provide a survey of the most promising approaches at both levels and classify them using the Open-edi reference model standardized by ISO. Whereas on the technical level, service-oriented architecture is becoming the predominant approach, on the business level the landscape is more heterogeneous. In this context, we propose—in line with the services science approach—to integrate business modeling with process modeling in order to make the transformation from business services to Web services more transparent.     

BROSEMWEB: A brokerage service for e-Procurement using Semantic Web Technologies

The Service-Oriented-Architecture (SOA) development paradigm has emerged to make an improvement in critical situations such as creating, modifying and extending solutions in the domain of business processes integration. Web services technologies are considered as the main units for SOA, for both intra- and inter-enterprise communication. Nevertheless, SOA does not have information about the events that occurs in business processes, which represents the main characteristics of supply chain management. Taking this into account, this paper proposes a middleware-oriented integrated architecture with the use of semantic features (concretely with the use of Linked Data) as data provider to offer a brokerage service for the procurement of products in a Supply Chain Management (SCM). As main contributions, our system provides a hybrid architecture that combines features of both SOA and EDA between several others.     

The process map as an instrument to standardize processes: design and application at a financial service provider

The standardization of processes and the identification of shared business services in a service-oriented architecture (SOA) are currently widely discussed. Above all in practice, however, there still is a lack of appropriate instruments to support these tasks. In this paper an approach for a process map is introduced which allows for a systematic presentation—as complete as possible—of the processes in an enterprise (division). After a consistent refinement of the process has taken place by means of aggregation/disaggregation respectively, generalization/specialization relations, it is possible to identify primarily functional similarities of the detailed sub-processes. The application of the process map at a financial service provider (FSP) highlights how these similarities can be taken as a basis to standardize processes and to identify shared services.     

面向服务架构体系的研究

伴随着Web Services技术的发展,面向服务架构体系(SOA)得到迅速发展。但还没有公认权威的SOA参考模型及SOA解决方案。为提出一个实用的SOA解决方案,详细阐述了SOA的定义、技术基础和主要特征并对OASIS组织的一个SOA参考模型进行了深入分析。随后,提出了一个整合非SOA系统和SOA系统的方案。该方案以Web Services为基础,结合了OASIS组织的SOA参考模型。它对整合传统非SOA系统有很强的实用性并且为架构SOA系统提供参考。事实证明,该方案是真实可行的。最后,提出在SOA研究中还急需解决的问题,如公认的SOA参考模型、统一的SOA架构体系标准及SOA的安全机制。     

基于语义的Web服务体系结构

现有的基于XML的Web服务规范或标准没有提供足够的手段来描述Web服务,以支持发现、组合以及执行Web服务的一般机制。因此,分布的、异构的和动态变化的Web服务的交互会产生很多问题。为了更有效地适应Web服务的分布的、异构的、不断变化的特点,针对现有的SOA架构健壮性不强的问题,提出了基于语义的SOA。通过增加Web服务的语义描述,并以这种具有语义的描述来发布和发现Web服务。从而使这种架构不仅支持功能的匹配,而且还能支持实现最佳质量标准的匹配。     

Collaborative learning using service-oriented architecture: A framework design

Collaborative learning serves as an important part of e-learning, increasing interactivity and accessibility to various learning resources either synchronously or asynchronously among users. Distributed interactivity through Web services thus forms the focus of this paper. The paper reviews related work on service-oriented architecture (SOA), distributed infrastructure, business process management (BPM) and highlights the need to integrate SOA technologies for meaningful and interactive collaborative learning processes. The significance of the study is an SOA approach to enhance the interoperability, flexibility and reusability of e-learning content in a collaborative environment.     

基于SOA的采购系统的设计与实现

该文基于SOA思想,结合具体平台讨论了Web服务的实现、发布和绑定过程。在模拟的UDDI平台上,构建了一个松耦合的采购系统,对其底层的实现作了详细分析,探讨如何通过SOAP协议实现与服务的交互,如何通过WSDL访问服务,如何通过UD-DI发布服务等。