Standard based Pub/Sub middleware, such as OMG Data Distribution Service (DDS), could assume a key role in supporting computer communications requiring continuous state information updating, deterministic deadline to ...Standard based Pub/Sub middleware, such as OMG Data Distribution Service (DDS), could assume a key role in supporting computer communications requiring continuous state information updating, deterministic deadline to data delivering and real time information adjourning. This kind of capability could be well ex-ploited by Peer-To-Peer (P2P) systems, Internet-wide as long as private ones, like in Public Safety or Civil Protection Communication Systems;but Pub/Sub specifications, and DDS/RTPS (Real Time Publish Sub-scribe) as well, usually do not provide Authentication & Authorization (AA) mechanisms. In the present work two important novelties are assessed: a possible scheme to implement AA in DDS/RTPS networks and a time performance evaluation study about embedded Authentication in RTPS.展开更多
为满足分布式实时应用的需求,项目管理组(OMG:Object Management Group)提出并发布了实时系统用数据分配业务(DDS:Data Distribution Service for Real-time Systems)规范。基于该规范,本文研究了发布/订阅系统的理论模型,设计了一个灵...为满足分布式实时应用的需求,项目管理组(OMG:Object Management Group)提出并发布了实时系统用数据分配业务(DDS:Data Distribution Service for Real-time Systems)规范。基于该规范,本文研究了发布/订阅系统的理论模型,设计了一个灵活、可靠的实时中间件(RTDDS:Real-time Data middleware),从而降低了各节点之间的时空耦合性,解决了分布式环境下数据传输的QoS和实时性问题。最后,本文给出了基于RTDDS的一个应用实例。展开更多
研究了DDS规范中的节点发现机制以及现有DDS中间件产品中不同实现机制,分析了现有的发现机制在大型分布式场景中所面临的问题,设计并实现了一种基于主题树的发布/订阅关系信息配置系统(Topic Tree Info Repo,TTIR)。通过TTIR对主题的实...研究了DDS规范中的节点发现机制以及现有DDS中间件产品中不同实现机制,分析了现有的发现机制在大型分布式场景中所面临的问题,设计并实现了一种基于主题树的发布/订阅关系信息配置系统(Topic Tree Info Repo,TTIR)。通过TTIR对主题的实时过滤,有效降低了节点发现过程所需要发送的消息数量。同时,在TTIR上实现了一种分布式的主题链路锁机制,用于管理DDS系统中并行实施的发布/订阅关系变更,有效保证了系统在升级维护过程中的高可用性。展开更多
文摘Standard based Pub/Sub middleware, such as OMG Data Distribution Service (DDS), could assume a key role in supporting computer communications requiring continuous state information updating, deterministic deadline to data delivering and real time information adjourning. This kind of capability could be well ex-ploited by Peer-To-Peer (P2P) systems, Internet-wide as long as private ones, like in Public Safety or Civil Protection Communication Systems;but Pub/Sub specifications, and DDS/RTPS (Real Time Publish Sub-scribe) as well, usually do not provide Authentication & Authorization (AA) mechanisms. In the present work two important novelties are assessed: a possible scheme to implement AA in DDS/RTPS networks and a time performance evaluation study about embedded Authentication in RTPS.
文摘为满足分布式实时应用的需求,项目管理组(OMG:Object Management Group)提出并发布了实时系统用数据分配业务(DDS:Data Distribution Service for Real-time Systems)规范。基于该规范,本文研究了发布/订阅系统的理论模型,设计了一个灵活、可靠的实时中间件(RTDDS:Real-time Data middleware),从而降低了各节点之间的时空耦合性,解决了分布式环境下数据传输的QoS和实时性问题。最后,本文给出了基于RTDDS的一个应用实例。
文摘研究了DDS规范中的节点发现机制以及现有DDS中间件产品中不同实现机制,分析了现有的发现机制在大型分布式场景中所面临的问题,设计并实现了一种基于主题树的发布/订阅关系信息配置系统(Topic Tree Info Repo,TTIR)。通过TTIR对主题的实时过滤,有效降低了节点发现过程所需要发送的消息数量。同时,在TTIR上实现了一种分布式的主题链路锁机制,用于管理DDS系统中并行实施的发布/订阅关系变更,有效保证了系统在升级维护过程中的高可用性。
