Abstract

which gives emphasis to services. OGSA defines the concept of Grid Service, which is a kind of web service with interfaces. The interfaces confirm convention, service discovery, dynamically creating service, lifecycle management,, notification, etc., and many Grid services can be integrated to satisfy VO’s requirements. GT3 is a new generation software toolkit used for building grids applications based on OGSA, and the core of GT3 supplies open grid service framework, API(for example: service data, notification, query, management of state), Java toolkits, and the environment of developing and running OGSA. The basic grid service of GT3 supplies GRAM(Resource Allocation Management), Index Service, reliable file transfers and other auxiliary services[5]. In GT3 each of the Grid services can be achieved by OGSI including three parts. The first is to describe the basic interface service defined in OGSI by using WSDL and XML Schema, and present the interface realization of Java, such as GridService, Factory, Registration, NotificationSource, NotificationSink, NotificationSubscription etc. The second is to supply the API in relation to GSH and GSR mentioned in the passag