基于QoS的动态Web组合服务选择方法

Dynamic Web Composite Service Selection Method Based on QoS

QoS已是衡量Web服务好坏的一个重要标准,基于QoS的Web组合服务在执行前进行的服务选择和执行中进行的服务选择是当前的主要两大选择方法。前者难以适应不可预知的服务环境变法,后者计算量大却难以控制整个服务流程的最优性。根据二者的优缺点,将二者结合起来提出了一种基于QoS的二次服务选择方法,先得到静态最优解集、在对其进行动态绑定。实验证明该方法可有效的避免二者的不足,继承二者的优点,保证服务的高效性,可靠性。

QoS is an important criterion to measure web service good or bad,based on the QoS web composite service before executing the service selection and implementation of service selection are currently the main two selection methods.The former is difficult to adapt to unpredictable political reform of the service environment,the latter with a large amount of cal- culation is difficult to control the optimality of the entire service process.According to both the advantages and disadvan- tages,the two combined made a selection method based on the QoS of secondary service,first to get the static optimal solution set,then dynamic binding to it.