关键词: Web服务, 工作流, 动态集成, 公平性, 遗传算法

Abstract: To deal with characteristics of dynamic, distributed and loose coupling of Web service flow, the service quality model considering impartiality was proposed and used in service dynamic integration. By analyzing differences between the Web service flow and the classical workflow, the definition of workflow based on Petri net was extended with a candidate set of services, and the concept of dynamic workflow net based on self-descriptive service composition framework was put forward. The comprehensive scoring model considering both Quality of Service (QoS) and impartiality of the service flow was presented. Dynamic integration of Web service flow were realized by selecting appropriate services which were conforming to users requirements and system environments through genetic algorithm. Experiment results showed that EQSELECT could not only select the optimal combinatorial service, but also consider the system impartiality.

Key words: Web services, workflow, dynamic integration, impartiality, genetic algorithm