一种面向Web服务的QoS提供器模型

A QoS Provider Model for Web Services

随着Web服务的广泛应用和发展，提供QoS保障能力是Web服务在商业应用中获得成功的关键因素．然而目前许多企业应用并没有提供面向QoS的Web服务，而修改已有的实现来满足客户对QoS需求的代价是非常高的．针对这一问题，本文提出了一个面向Web服务的QoS提供器模型，通过提供灵活的QoS处理器（QoS Handler）管理和部署机制，可以使原系统在不改变内部实现的情况下，向客户提供满足其QoS需求的Web服务．QoS提供器存应用服务器平台上进行了原型实现，结果表明它可以有效地为企业系统添加QoS保障．

With the rapid development of Web services, providing quality of service （QoS） becomes a key factor to achieve success in business. At present, a lot of enterprises systems do not provide QoS-enabled Web services. However, modifying the implementation of those systems to satisfy the requirements of consumers is exorbitant. To solve this problem, this paper brings forward a QoS provider model. The model provides a flexible mechanism for managing and deploying QoS handler, and makes legacy systems provide QoS on-demand Web service to consumers without changing the implementation. The QoS provider is prototypically implemented on the application server, which shows the feasibility of providing QoS guarantee to enterprise applications.