Design And Implementation Of Distributed Pollution-free Agricultural Products Certification Resource Service

In recent years, the quality and safety of agricultural products is becoming increasingly prominent, the agricultural products certification is an important mean to ensure the quality and safety of agricultural products. Chinese agricultural products certification system, in order to ensure the quality and safety of agricultural products for the purpose of the certification of pollution-free agricultural product development is developing rapidly, during "the Twelfth Five Year Plan" period, the production of harmless agricultural products of national origin area reached a total area of60%, the product reached number70000. Along with the certification of products and the rapid growth of the number of origin, formed by the huge resources not only relates to the authentication data but also a wide range of orderly Association, and change over time, for a comprehensive, accurate grasp of product and producing area, producing area environment, production tracking operation change has played an important role. But at present the certification of pollution-free agricultural product information sharing degree is low, product awareness is not high, this not only restricted the development of pollution-free agricultural products, but also reduces the agricultural product quality safety guarantee degree. Based on this, this article in wide area distributed pollution-free agricultural products certification of digital resources as the object of study, resource accessing transparency as the goal, carried out the design and realization of pollution-free agricultural product resource sharing service certification.Through the analysis of certification resources characteristic, certification resources organization system and description scheme are proposed. Among them, from the collection and object perspective, the application of set analysis model is to complete certification resources division and organization, establishment of a multi-level structure of certification resources set partitioning model; certification of resources and resources around the relationship between the description, using the metadata technology, established by the structural layer and content layer metadata framework model, and the metadata standard design.Around resource distribution management and support services, for the certification of pollution-free agricultural product resources as a hierarchical processing, established by the central domain and resource domain constitutes the sharing service network model, design by the data service, data services, management services and application service interface service function structure, and in accordance with the sharing service network model, on the certification of resource level structure and the sharing service level segmentation, formed a certification resources sharing service system structure. And expatiated the certification resources metadata service mechanism, wherein, a metadata storage service, using two phase commit protocol and database timing monitoring technology, solve resource between the association mapping, data between nodes in the data transmission process synchronization and fault tolerant processing; metadata request service, using the iterative work way and cache technology, realized the distribution environment certification of global resource retrieval service and fast retrieval service.Based on Web Service technology, the J2EE technology platform SSH lightweight framework, distributed certification of pollution-free agricultural product resource sharing service system is realized, and is running in the simulation environment. The running results show that, the sharing of resources service system can be widely distributed certification resources integration as virtual certification resources, for consumers, enterprises, departments and government services object provides resources uniform logical view, implementation resource accessing transparency.