Chinese Journal of Computers   Full Text
Title	An Extensible Management Framework for Web Service QoS
Authors	SHAO Ling-Shuang LI Tian ZHAO Jun-Feng WANG Ya-Sha XIE Bing MEI Hong
Address	(School of Electronics Engineering and Computer Science, Peking University, Beijing 100871) (Key Laboratory of High Confidence Software Technologies of Ministry of Education, Beijing 100871)
Year	2008
Issue	No.8(1458—1470)
Abstract &   Background	Abstract Web service is emerging as a promising technology and attracts many attentions from industry and research domains. With the popularity of service technology, many researchers propose that not only functional but also non-functional properties, also known as quality of service (QoS), should be taken into consideration. Researches have intensively explored many QoS related problems, such as QoS-aware dynamic service selection and composition, etc. However, existing approaches emphasize on how to make use of QoS information, the technologies on collecting, storing, measuring Web service QoS information are not intensively explored. It’s obvious that these fundamental technologies are also very important for successfully building QoS related applications. To address this problem, this paper proposes an extensible QoS information management framework, analyzes the technologies included in this framework, and presents the design decisions and solutions in Software Component Library Project of Peking University. Finally, this paper describes a real case study of applying this management framework in a project of 863 Program. The case study shows that users can extend the management framework and manage Web Service QoS according to their domain-specific requirements, which evaluates the extensibility and practicability of this QoS information management framework. Keywords Web service composition; QoS (quality of service); QoS modeling; QoS information collecting; QoS measurement Background This research is sponsored by the National Key Technology R&D Program of China under grant No.2006BAH02A02, the National High Technology Research and Development Program (863 Program) under grant (Nos.2006AA01Z189, 2007AA010301), and the National Basic Research Program of China (973 Program) under grant (No.2005CB321805). The research scopes cover several fields of software engineering, including software reuse and software component technology, domain engineering, software architecture, component operating platform, Web services, Internetware, etc. The team has made important progress, amongst of which is the research and development of PKU Component Library system. The Component Library system provides the functionality of managing software component around the whole life cycle. In Component Library system, Web service is a type of component. The quality of Web service is always a hot research topic. The work described in the paper is aimed at providing a management framework for Web service QoS. This framework and implementation covers the QoS information collecting, storage and computation. This framework can easily be extended according to some specified policies.