Research On Data Transfer In Real-time Supervision Information Systems

The distributed information systems are expanded from 2-tier client/server architecture to 3-tier (n-tier) architecture by the middleware technology. The flexibility and manageability of the systems can also be improved by this technology. When the middleware is used as the middle-tier to architect the distributed systems, the difficulty of designing and integrating them is reduced, the quality of software and the development efficiency is improved and the cost of software development and maintenance decreases. Recently, because of the real-time applications developing, the supporting of the real time middleware has urgently been needed. This thesis tries to study the model of the real-time message oriented middleware (MOM), through constructing a real-time MOM based on the TCP/IP protocols, which is used as the supporting platform to solve the problems of data transfer in the real time supervision information system (RSIS), providing the real timeness, reliability, security and high efficiency data-transfer-service for RSIS or other familiar distributed systems.At first, the characteristics of the loads, the communication protocols and RSIS are analyzed in the thesis. Based on this analysis, the TCP is chosen the protocol of the transportation layer to architect the middleware. Secondly, the load-scheduling algorithm is analyzed and grouped, and the advantages and disadvantages of them are also pointed out. Thirdly, the model of the real time MOM is presented with respect to distributed computing model, architecture, concurrency model, scheduling model and the security model. Fourthly, the software RMQ (Real time Message Queue) is designed and implemented in JAVA. And finally, the thesis ends with the conclusion and the further works.