从中间件技术看网格技术的发展“Thecomputationalgridisexpectedtodrivetheeconomyofthe21stcenturysimilartotheelectricpowergridthatdrovetheeconomyofthe20thcentury”Grid中间件的地位UserApplicationGridMiddleware-InfrastructureAPIs(serviceoriented)SiteASiteBNetworkInfrastructureGT-著名的Grid中间件GT向着标准化的方向发展Increasedfunctionality,standardizationCustomsolutions1990199520002005加速技术的发展?促进应用的推广?吸引业界的加盟?OpenGridServicesArchRealstandardsMultipleimplementationsWebservices,etc.GlobusToolkitDefactostandardSingleimplementationInternetstandardsWebService技术—面向服务WSASOAPWSDLUDDI目前的成功:Internet上无处不在的HTTP简单应用集成的简单技术……ServiceGrid::=Grid中的Service“服务”是物理和逻辑资源,以及暴露在网络上的应用功能的逻辑展现。(e-scienceproject)Aserviceisthelogicalmanifestationofsomephysicalorlogicalresources(likedatabases,programs,devices,humans,etc.)and/orsomeapplicationlogicthatisexposedto