Dynamic Execution Strategy of Web Service Composition Based on e_SPDL and Service Container

2009 Ninth International Conference on Hybrid Intelligent Systems Pub Date : 2009-08-12 DOI:10.1109/HIS.2009.263

Dan Yang, Hong Wang, Yang Liu

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引用次数: 1

Abstract

Web service composition makes it possible for Web service reused, assembled, providing value-added service. The key problem of web service composition is to find an effective modeling language and to describe it with composition definition language.BPEL4WS is a newly process definition language which is relatively complex and difficult to use. And BPEL4WS only supports static binding of existing services, and put binding of process and services as a known condition. But most of time dynamic service composition is needed to cater to the high dynamic environment. In this paper, firstly a process modeling language e_SPDL based on XML is proposed by simplifying and extending BPEL4WS.e_SPDL is used in the prototype system (e_Scope4WS) which supporting web service composition. The basic structure and control structure of e_SPDL are presented in detail, and a composite service instance described in e_SPDL is given. Then the concept of service container is introduced in e_SPDL which provides the basis for dynamic service execution strategy.And the structure of service container is given. Finally the dynamic execution strategy of the process (i.e. composite service) based on e_SPDL and service container is given.

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基于e_SPDL和服务容器的Web服务组合动态执行策略

Web服务组合使得Web服务的重用、组装、提供增值服务成为可能。web服务组合的关键问题是寻找一种有效的建模语言，并用组合定义语言对其进行描述。BPEL4WS是一种较新的过程定义语言，它比较复杂，使用起来比较困难。而且BPEL4WS只支持现有服务的静态绑定，并将流程和服务的绑定作为已知条件。但是很多时候，为了适应高动态性的环境，需要进行动态的服务组合。本文首先通过对BPEL4WS的简化和扩展，提出了一种基于XML的过程建模语言e_SPDL。e_SPDL用于支持web服务组合的原型系统(e_Scope4WS)。详细介绍了e_SPDL的基本结构和控制结构，并给出了e_SPDL中描述的一个复合服务实例。然后在e_SPDL中引入了服务容器的概念，为动态服务执行策略提供了依据。并给出了服务容器的结构。最后给出了基于e_SPDL和服务容器的过程(即复合服务)的动态执行策略。

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2009 Ninth International Conference on Hybrid Intelligent Systems

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