由OMG组织提出的数据分发服务(DDS)采用发布/订购工作机制,它为分布式应用系统提供了实时、高效的按需数据分发模型.首先分析了以数据为中心的按需分发工作机制,结合分布式网络环境的特点,构建了信息按需分层分发系统框架；然后具体给出了框架的组成要素及其功能,并设计了各成员之间按需分发的行为方式以及两层信息分发的交互策略；最后阐述了发布/订购的数据模型及信息过滤方案.该框架为分布式网络构建按需分发系统提供了参考模型,同时也为系统的进一步研究和应用奠定了基础.%The data distribution service ( DDS) proposed by Object Management Group ( OMG) is adopting publishing/subscribing operational mechanism to offer real-time and high efficient on-demand data distribution model for distributed application systems. Firstly, the on-demand operational mechanism with data as the kernel is analyzed; the framework of on-demand information distribution system is built by combining the features of distributed network environment. Then the main compositions and functions of the framework are given specifically, and the behavior patterns of on-demand distribution among each member as well as the interacting strategy of two-hierarchy information distribution are designed. Finally, the publishing/subscribing model and information filtering method are described. The framework offers reference model for distributed network to establishing on-demand distribution system, and also lays a foundation to research and apply the systems in further.
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