Based On The Dds Data Distribution System Design And Realization

With the development of the network, distributed computing has become the main stream of the computing technology undoubtedly. As one of the key techniques, although the current state-of-the-art distributed middlewares could make information and computational resource shared more transparently and effectively by providing fine communication transparency and well designed development environment, the serious problem behind these systems is the lack of real-time support for real-time applications. Consequently,while today's applications in real-time computing are more and more distributed, and more and more mission critical application domains have adopted distributed object-oriented architecture, they typically consist of many processes executing on a number of nodes, and communicating through an interconnection medium, data distribution with real-time support and Quality of Service (QoS) support become the focus on such preliminary research to fulfil the increasing requirement for it.Concerned about this and the demand of distributed real time applications, this paper gives a special attention on communication models in distributed heterogeous environment. In conjunction with the publish/subscribe model,this paper analyses the data-centric publish-subscribe model used by Data-Distribution Service (DDS), which is published by OMG, analyses the communication mechanism of DDS and the QoS that DDS relies on. Then designs and implements a new Data-Distribution Service based on OMG DDS.