动态网络环境(如网格、Ad hoc Wireless Network等)使面向服务的应用面临许多新问题.如何使用户能够透明、动态地按需使用各种服务是其中的研究热点之一.文中提出了一种虚拟服务模型,在此基础上定义了虚拟服务的组合运算,给出了服务动...动态网络环境(如网格、Ad hoc Wireless Network等)使面向服务的应用面临许多新问题.如何使用户能够透明、动态地按需使用各种服务是其中的研究热点之一.文中提出了一种虚拟服务模型,在此基础上定义了虚拟服务的组合运算,给出了服务动态查找的算法.此外,文中还介绍了支持虚拟服务透明组合的P2P服务组合原型系统,并在实验基础上对虚拟服务及其支撑引擎进行了客观评价.实验表明,本文所述虚拟服务及支撑引擎能使面向服务应用较好地适应动态网络环境下的服务变化,使用户能够透明地按需使用各种资源.展开更多
Composing existing web services for enterprise applications may enable higher level of reuse. However the composition processes are mostly static and lack of support for runtime redesign. In this paper, we describe ou...Composing existing web services for enterprise applications may enable higher level of reuse. However the composition processes are mostly static and lack of support for runtime redesign. In this paper, we describe our approach to the extension of the OWL-S ontology framework for dynamic web service composition. We raise the level of abstraction and propose an abstract service layer so that web services can be composed at the abstract service level instead of the concrete level. Each abstract service is attached with an instance pool including all instances of the abstract service to facilitate fail-over and dynamic compositions.展开更多
The composition of the web service is a common technique to attain the best results of complex web tasks.The selection of appropriate web services,linking those services in the action flow and attaining the actual fun...The composition of the web service is a common technique to attain the best results of complex web tasks.The selection of appropriate web services,linking those services in the action flow and attaining the actual functionality of the task are the important factors to be considered.Even though different frameworks and methods have been proposed to dynamically compose web services,each method has its advantage and disadvantage over the other.Most of the methods give much importance to the Quality of Service(QoS)but fail to achieve the actual functionality after composition.This paper proposes a functionalityoriented composition technique for composing web services.Moreover,this method helps reach the extreme functionality of each web service in the composition towards customer satisfaction.Apart from considering the overall QoS of every single service,the non-functional parameters associated with these services are also considered for achieving the expected functionality.Each of these nonfunctional parameters has a vital role in the functional performance of the web service.The web services that satisfy the non-functional requirements are chosen to form the composition to attain the best performance.The list of services in the proposed composition method is different from the conventional one,which is composed based on the overall QoS.The non-functional parametric values,the QoS of each web service and the overall QoS after composition are evaluated for the proposed method and experimentally analyzed to prove their advantage over the others.展开更多
文摘动态网络环境(如网格、Ad hoc Wireless Network等)使面向服务的应用面临许多新问题.如何使用户能够透明、动态地按需使用各种服务是其中的研究热点之一.文中提出了一种虚拟服务模型,在此基础上定义了虚拟服务的组合运算,给出了服务动态查找的算法.此外,文中还介绍了支持虚拟服务透明组合的P2P服务组合原型系统,并在实验基础上对虚拟服务及其支撑引擎进行了客观评价.实验表明,本文所述虚拟服务及支撑引擎能使面向服务应用较好地适应动态网络环境下的服务变化,使用户能够透明地按需使用各种资源.
文摘Composing existing web services for enterprise applications may enable higher level of reuse. However the composition processes are mostly static and lack of support for runtime redesign. In this paper, we describe our approach to the extension of the OWL-S ontology framework for dynamic web service composition. We raise the level of abstraction and propose an abstract service layer so that web services can be composed at the abstract service level instead of the concrete level. Each abstract service is attached with an instance pool including all instances of the abstract service to facilitate fail-over and dynamic compositions.
文摘The composition of the web service is a common technique to attain the best results of complex web tasks.The selection of appropriate web services,linking those services in the action flow and attaining the actual functionality of the task are the important factors to be considered.Even though different frameworks and methods have been proposed to dynamically compose web services,each method has its advantage and disadvantage over the other.Most of the methods give much importance to the Quality of Service(QoS)but fail to achieve the actual functionality after composition.This paper proposes a functionalityoriented composition technique for composing web services.Moreover,this method helps reach the extreme functionality of each web service in the composition towards customer satisfaction.Apart from considering the overall QoS of every single service,the non-functional parameters associated with these services are also considered for achieving the expected functionality.Each of these nonfunctional parameters has a vital role in the functional performance of the web service.The web services that satisfy the non-functional requirements are chosen to form the composition to attain the best performance.The list of services in the proposed composition method is different from the conventional one,which is composed based on the overall QoS.The non-functional parametric values,the QoS of each web service and the overall QoS after composition are evaluated for the proposed method and experimentally analyzed to prove their advantage over the others.
