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Study of the Key Technologies in QoS Oriented Web Service Composition

Author: LiuBing
Tutor: WangHaiYang
School: Shandong University
Course: Computer Software and Theory
Keywords: Service Composition QoS forecast Load Business Process
CLC: TP393.09
Type: Master's thesis
Year: 2010
Downloads: 302
Quote: 4
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Abstract


In recent years, web services have developed rapidly as an important mode of software application, while many web services provide the same function. Service composition means to compose some small size services into a large size service, by which the users can achieve their business requirement with variety of services. Quality-of-Service (QoS) is a crucial standard in service composition, so it is an important problem that how to select appropriate services to make the service composition which can meet the QoS requirement of the user.It has many problems at the study of service composition based on QoS. First, the QoS offered by the service provider is measured in the ideal operating conditions, which gets a performance gap with the QoS in actual operation and lacks of authenticity. Second, the users usually describe the way to call the services with business process, of which the structure affects the overall QoS of the service composition, to achieve their business needs while composing services. Thus, the service composition arithmetic to meet the user’s QoS requirement must base on the business process structure analysis, which is inadequate in the existing studies. Besides, close relationship exists among the various functional units. To combination the QoS forcast and the service composition, it needs a management framework describing the position of each functional unit and their relationship.Based on the above conditions, after the study of the existing arithmetic, this paper does the research to the key technologies of service composition in the following aspects.The first is to bring a QoS based service composition management framework, which comprised of three modules of service composition customization, providing a seamless integrated environment for the function of QoS forcast and service composition.The second is to design a QoS analysis and forecast arithmetic, which can forecast the QoS of the web services with the SLA, QoS history and actual load. This arithmetic could offer the most actual QoS.The third is to give a service composition arithmetic based on the QoS analysis in business process with the QoS offered above. It contains the QoS analysis of the service composition based on the business process structure with the composition tree, and then the service composition customization and optimization arithmetic. Considered that the new service customization may impact on the services, it has a QoS validation to each affected service, to judge whether it is necessary to re-customize the correlative compositions.Above all, this paper first proposes a management framework of service composition based on QoS. Sustained by the framework, the paper manages the QoS history at the service invoking, and then forcast the actual QoS based on the load of the service. Following, it analyses the business structure by the composition tree, thereby gives a service composition algorithm to satisfy the QoS requirement of the user. The combination of this series of algorithms achieves the actualization of the QoS and the effect of the process structure to the overall QoS in service conposition adequately.

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