Multi-Broker Based Grid Service Resource Discovery Model

Grid gets widely global attention as the third tidal wave of information technology after Internet and Web. Grid, a resources sharing style based on Internet, pushes Internet into a new phase. OGSA (Open Grid Service Architecture) brought forward by Globus project team and IBM provides a standard resolution for the development of Grid Service. OGSA combines the service standards of Globus and Web to provide Grid Service in a uniform way. There are many challenging problem to be solved in grid services publishing, detecting and invoking in the grid environment which is widely distributed and isomerous.This dissertation analyzes the advantages and disadvantages of the mechanism of resources detecting, and combines the semantic, P2P technology and the grid to use grid service broker to save the published grid service. It also brings forward a model of grid service resources detecting based on the semantic, P2P technology and multi-broker. This dissertation brings forward a service publishing style based on publisher/subscriber model. The service provider registers the service semantic to a symmetrical node, and the user submits his service request to a symmetrical node. The symmetrical node who receives the service request disposes the service request locally or remotely to complete the service matching and detecting. In the dissertation, the intellectualized service searching uses the semantic repository to describe and match the service. It advances the precision of service detecting, and make it fit to the characteristics of grid service, such as it is complicated, isomerous and dynamic. It also has good expansibility.In this dissertation, it uses the Tomcat server as the Globus container to implement register server, and solve the technical problem which comes during the program invoke between different platforms, and implement platform connection between Java programs with Web service. This dissertation makes searching and invoking grid service with WSRF framework.This dissertation focuses on grid service publishing, searching, invoking, and then discusses the framework of multi-broker based grid service discovery design and implement. It makes a roundly analysis on tow P2P models on the P2P model composed by two kinds of Brokers both in theory and experiment, and brings forward an improving resolution to be used into the implementation of system.