基于可变粒度的服务工作流系统服务质量可控性研究

摘要

Through analyzing what influence of business frequency on QoS,as well as the relationship between business frequency and system efficiency,a method about dynamic web service composition was proposed based on QoS which become controllable and multi-granularity,with corresponding algorithms.According to the business frequency,under the condition of few candidate services,the system took measures to make adaptive adjustment to its structure so that QoS of whole system was kept optimal.Simulation results indicate that this approach can continue fully to improve operation efficiency of web service workflow.%通过分析业务频率对服务质量（quality of service,QoS）的影响,以及服务粒度和系统性能之间的关系,提出一种服务质量可控的、多粒度的服务动态组合方法,并给出了相应的算法。该方法在候选服务集少的情况下,根据业务的发生频率,可对系统结构做自适应的调整,进而把系统的整体服务质量控制在一个最优的水平。仿真实验结果表明该方法完全可以持续改善服务工作流系统的运行效率。