Research On Key Technologies Of Service-oriented Information System

With the rapid development of computer science and technology, the software industry is facing new challenges. Traditional methods on software developing and designing can not meet the new requirements of the times. With the development of SOA (Service-Oriented Architecture), the coupling degree of the software system can be greatly reduced and the distributed development of the software can be conducted effectively. Users can add new services or update the existing services according to the modular and offer services via varied channels so as to quickly respond to the changing business needs, achieving the efficiency, availability and the scale of the software development, improving the reuse rate and reducing redundancy. The study of service-oriented information system and key technology has an in-depth research on the architecture, security, and reliability of information system and Web service resource management. The main research is as follows:The overall architecture and systematic framework of information development platform is put forward, aiming at the relationship between systematic framework and overall architecture of service-oriented information system on the basis of theoretical analysis and experiments. Based on ESB, the dissertation analyzed the main issue of it from four aspects--messaging, message transformation, message routing and service container, proposed an ESB-based hierarchical SOA architecture model, gave the model of single buffer intermediary and double buffer intermediary of both client and server. What’s more, the result of the intermediate experiment of single buffer intermediary and double buffer intermediary shows that the latter can greatly improve the efficiency and the respond speed of Web service.Aiming at solving the problem of information system’s security, it put forward a SOAP message-based secure model on the basis of analyzing the Web service security need and WS-Security specification and expansion of SOAP message mechanisms. And, the confidentiality, integrity, and non-repudiation of the·information in Web service are ensured by the use of XML encryption, XML signature and time stamp security mechanisms. The experimental result shows that the model can achieve the purpose of protecting the fine-grained information.As for the Web service reliability and metrics issues, the dissertation analyzed the Web service and the characteristics of traditional software reliability model, concluded and pointed out the relationship between Web service reliability and service structure, proposed an improved model which is based on control structure. The model takes structure and combination condition among the services as an important factor of reliability evaluation, making the reliability of the measure more precise.The Web service resource management is concerned on the basis of analyzing Web service management specification, and it expanded the OoS attributes of UDDI and SOAP, designed Web service resource management framework. It described the process of adopting this framework to conduct service publishing, discovery, selection and portfolio optimization and gave calculation methods and optimization strategies of four structured OoS attributes. It proposed a QoS-based discovery model, offered basic matching, function matching, quality matching and service matching rules, resource rating and the algorithm of discovery. The experimental result shows this algorithm has improved in service check precision and matching efficiency.The above-mentioned key technologies in transportation administration verified the feasibility of the construction of Service Bus architecture-based information system. During the construction process of the system, it applied related technologies such as service resource management, service reliability and service security, which ensured effectiveness of the building and running of the transportation administration.