一种基于网格环境的服务合成模型

本文在web服务合成的基础上，根据抽象工作流和具体工作流责任两种概念，增加了服务的factory机制，加入了服务状态管理器，提出了一个适合于网格环境中的服务合成模型。它采用语义Web中的技术和方法，对服务问的输入输出进行近似的语义匹配，采用动态自适应算法来实现服务的合成。从某种程度上来说，这种服务的合成实质就是对工作流的合成。这个服务合成模型既实现了服务的自动合成，同时又提高了服务合成的容错性和可扩放性。

A Service Composition Model Based on Grid Environment

This paper aims at researching how to realize the service composition automatically in grid environment.The research about the service composition techniques in Web environment finds that all these existing methods don't take into account the states of grid service,so it isn't applicable to the grid environment.So a service composition model based on grid environment is proposed.It adds a service factory and divides workflow into abstract workflow and con- crete workflow.The input and output between the services are matched semantically and the model uses an adaptive al- gorithm to compose the services.This model can not only compose the services automatically,but also provide a high degree of fault-tolerance and scalability.