【摘要】 对城轨线网的数据信息及其特征进行了分析,讨论了推送和拉取的信息分发机制,提出了一种适合于城轨线网的信息分发机制,该机制将推送与拉取相结合,根据当前系统分发信息的特征和及时性要求,通过动态分配可用资源来确定推送和拉取,达到最小化数据块分发延时的目的。实验结果表明,推拉相结合的信息分发机制通过动态调节参数,既可适用于线网中严格一致性需求的信息流,也可适用于线网中非严格一致性需求的信息流,还可适用于线网中根据需要随时获取的信息流。更多还原

【Abstract】 The characteristics of data information in urban rail transit line network are analyzed.The push and pull information dissemination mechanism is discussed.In this paper,a kind of information disseminating mechanism is presented,which combines push approach with pull approach and fits for urban rail transit line network,by which the system can dynamically and intelligently allocate the available resource between push clients and pull clients so as to optimize the sending time delay of data chunk given their characters and desired currency.And the experimental results are presented to validate the approach.The major conclusion is that the approach of combination push with pull can fit for both stringent coherency requirements for data item and less stringent coherency requirements for data item on line network,also can fit for acquiring at any time according to requirement on line network,by optimizing the parameter dynamically.更多还原