Research On Domain-Adaptive Grid Service Composition Algorithm

Grid technology and its infrastructure can achieve to highly integrate within and between different organizations, resources and services , which bring new ways and means to solve the problem of high-performance computing.As one project of Henan Province base and advance technology research plan ,'Domain-Adaptive Grid Service Composition Algorithm research and realize'aim at enabling users to meet the dynamic business needs by transparently compounding service.As Grid service composition algorithm is one of key factor to affect Grid system performance,how to design an efficient, simple service composition algorithm is major issues.This paper,viewing of the current needs and problems in grid service description and discovery,conducted a theoretical study of grid service description information expansion and service discovery model improving, which aimed to provide an initial technical support for this project.1.Grid resource management services have been systematically studied,the grid architecture is described, in particular the Open Grid Services Architecture OGSA. in studying past grid resource management model , Domin-based grid resource management model is built.2.The concept of cooperative intelligent grid (CIG) is discussed. The service-oriented, softman-based and policy-driven grid organization model in the form of community/federation is constructed. The role-based medium service collaboration mechism erects a hierarchical collaboration relation among grid entities of CIG, can realize the flexibility, expansibility and condensablity of the system. The division of virtual community realizes hierarchical and structural collaboration. Medium service is a catalyzer for each entity developing and coordinating social activity.3.Domain templates build and update algorithm of the domain-adaptive grid service is designed. According to match the quality of service corresponding grid service is selected by adopting service domin related evaluation factor to evaluate the quality of grid service. Through domain knoledge database composed of domain templates, the apparently expresses of cooperation logic that separates from the computing logic is realized, the effect that software control structure is transparent to users is obtained.The domain template auto-updating algorithm which is based on ant colony algorithm insures the development, real time and validity of domain templates.