Agricultural Products Distributed Certification System Based On Workflow Technology

The rapid development of construction of agricultural information enables the continuous improvement of traditional authentication model of pollution-free agricultural products.The traditional model of authentication is to be completed manually.With the widespread application of Internet technology and e-government technology,this authentication model gradually reveals a series of shortcomings such as low efficiency,information asymmetry,and redundant work.At present,there hasn't been a complete and highly efficient set of digital authentication system for agricultural products in China.By introducing modern agricultural information technology to the management of China's agricultural product authentication,which has created a digital technology platform to enable China's authentication of agricultural products to achieve standardization,digitization and informationization in key areas such as producing area evaluation,reporting,reviewing,monitoring,query, etc,China's agricultural products authentication in terms of digitization and informationization has been greatly advanced.Furthermore,by doing this,the process of digital agricultural has been promoted,traceability of agricultural products, regional planning of agricultural products,agricultural products online trade, decision-making system of agricultural production,agriculture early warning,remote diagnostics and related technologies will be facilitated.This paper first introduces the working status of the pollution-free agricultural products authentication,history,background,functions and features of the development of workflow technology,and relevant operation based on the workflow. The characteristics of distributed authentication system of agricultural products and key business processes are analyzed.By analyzing the automatic authentication of pollution-free agricultural products and the actual development needs of key business processes,in order to improve system life cycle,reducing the cost of the project,it is proposed that based on the traditional relational database,a framework for key for lightweight workflow which can be applied to key business is designed and implemented.The framework is constituted by workflow engine,distributed data model,workflow modeling,and WebService.Distributed authentication system of agricultural products is based on J2EE technologies and uses BEAWeblogic9.2 for application services and WebService containers.It adopts Spring2.0 as application framework and the Hibernate3.2 as data persistence layer,using Oracle 10G database system.The system adopts a three-tier system,applying workflow technology and WebService technology,to achieve the sharing of authentication resources under the distributed environment and seamless integration of authentication process,and to achieve a full range of electronic management of agricultural products authentication in the origin evaluation,product testing,reporting,authentication and so the whole process.Based on the analysis of authentication process,authentication of agricultural products are characterized with features such as being structurized,with overall distribution of the business process,and part of the business activities being relatively concentrated.The feature of distribution is represented by that the authentication process is distributed in the central node and the distributed node;Being relatively concentrated means that authentication activities such as origin testing,product testing, form inspections,compliance reviews,origin,such as CFA and product are mainly distributed within the nodes,the product review and Final product authentication activities are concentrated in the central node.According to this characteristic,the authentication process can be simplized into two domains,namely,the activities of central node domain and activities in the distribution node domain.Following WfMC criterion,with application of WebService technology,a semi-concentrated, semi-distributed workflow authentication management system is being built,with one workflow server in each domain to manage the implementation of the instance of the object activities.Being distributed means that objective instances are distributed in the two domains,and the authentication activities are completed by workflow servers in the two domains through the cross-coordination of the WebService.By using metadata,authentication data services of distributed node and central node complete the searching of resources and positioning of objects,the resource objects are accessed by WebService.Authentication data resources is a four-storey structure of services.The first layer,directly facing the bottom of the data storage resources,including file system and database systems;second layer,data resource agency services,providing data access,data location and data integration services;the third layer,composing metadata directory based on the index of the project instance declared of meta-data services in application layer,index of certification process instance,agricultural products,certification information indexing and filing the record of origin authentication information to build the index meta-data directory.When accessing object from authentication data source,the system queries metadata directory and returns information resources to the data resources of the data proxy service positioning module;the fourth layer,authentication data resources users accessing interface,including user interface and distribution of the local environment to use the WebService interface.Finally,this paper,based on existing technology,brings forward how to improve the system,including the establishment of semi-centralized and semi-distributed structure to decompose the pressure business processes to each node to balance the load,reducing the pressure of workflow information caused by repeated transmission;The paper advances the concept of authentication data resources,and has done an efficient exploration on the standardization of authentication data resources;Through WebService provided by the node structure,scattered data resources of nodes will be effectively integrated into a virtual authentication resource database,to achieve the sharing of authentication data resources between nodes;By using WfRBAC access control model,the static role-based access control and dynamic task-based access control are combined with the realization of the same role possessing different access-control functions in the workflow process,and ensuring the security of normal day-to-day use and maintenance.At the same time,the paper also puts forward a series of problems that haven't been solved by the integration of pollution-free agricultural products authentication,such as declaration of inter-provincial agricultural products and its origin and so on,which are not involved in the system.This is also the main working content for system improvement,as the work of authentication integration advances.