Object-Relational Real-Time Data Middle Layer

As the development of Object/Relational Mapper, there are more and more persistence layers,such as Nhibernate,Toplink,widely used in ERP. However,modern applications such as process controlling and real-time data processing need real-time requirements,such as Environmental protection industry.This dissertation is about background,structure design of Real Data Layer in the organization of Object/Relational Mapper. TORM and RTDB is distributed-network system. By Associate with this core technology named running framework,TORM and RTDB can easily be used in the environment of distributed network. As a common framework,running framework provides basic services,such as network cornmunication,multiple-thread scheduling. This system with typical c/s architecture supports multi-clients. It alse provides object buffer in order to maintain the intergrity of objects.It gives out the whole structure design of TORM and RTDB. Meanwhile, we discuss the differences and relations among multiple layers mechanisms, persistence layer and real data layer. By comparison with the former mechanism,multiple layers mechanism carries more efficient. At the basis of analysis on the real data system, TORM and RTDB implement the combination of persistence layer and real data layer by introducing the multiple layers mechanism. It also implements both alarm center layer and facility control layer in the collaboration of call back mechanism. Depending on the analysis of real data cache,we propose a way of concurrence control.Finally,the author summarizes the development of TORM and RTDB and points out the future direction of the TORM and RTDB.