• Document: WAN-DDS A wide area data distribution capability
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1 WAN-DDS A wide area data distribution capability Piet Griffioen, Thales Division Naval - Above Water Systems, Netherlands Abstract- The publish-subscribe paradigm has shown DDS. Then publish – subscribe in the wide area many qualities to efficiently implement distributed context is discussed and an assessment is given about systems. In the era of Global Information Grid, this the DDS in the maritime wide area. As a result of paradigm can be applied for information sharing across that, the basic principles of a WAN-DDS capability systems and platforms of a maritime coalition. As with are formulated and the need for an underlying overlay CMS, it is especially well suited to support maritime surveillance information flows across platforms. This network is discussed. Finally, it is explained how a paper will introduce the concepts and principles of a WAN-DDS fits within a Service Oriented wide area Data Distribution Service (WAN-DDS) as one Architecture (SOA). essential information dissemination service within the Enterprise Services architecture of the GIG. It will II. DDS IN A NUTSHELL show how the mechanisms of the OMG DDS standard The OMG Data Distribution Service (DDS) is a can be extended to a wide-area context, how it can be integrated into a maritime wide area network middleware service for data centric, distributed real infrastructure and how it fits in a web services time systems. The DDS is based on the publish – architecture. subscribe paradigm and builds on the concept of a global data space. Publishers write their data into the Index Terms – publish/subscribe, DDS, wide area, global data space and the service delivers the data to overlay network, web services all interested subscribers and informs the subscribers that new data is available. I. INTRODUCTION The DDS provides for decoupling in space, time Interoperability and collaboration in a mobile and frequency between publishers and subscribers. tactical environment are the pillars for shared, timely Publisher and subscriber only share the notion of a and fused awareness of the maritime environment common information model. The basic gathering of enabling coordination and speed of command. The information is a Topic. A Topic is a structured data type of information which needs to be shared, the type with a (composite) key that identifies the people with whom it needs to be shared, and the speed instances of that Topic. with which the information needs to be gathered and The DDS supports also content-based subscription, made available, is determined by force structures, where a subscriber expresses its interest in a Topic concepts of operations, and the way the information is whose attribute values meet some expression. utilized to support a mission. Publish – subscribe data distribution is a proven concept that can provide the right information at the App App App right place and at the right time [1]. Publish – subscribe communication is data centric and enables automatic data processing with minimal dependencies between publishers and subscribers. Publish – subscribe is one of the service interaction models in the Global Information Grid (GIG, [3]). The GIG is DDS Global Data Space taken here as a reference. There are several publish – subscribe models and technologies available, but the OMG DDS [2] has Figure 1 DDS and the global data space become popular since it has been released as a standard. Next section will give a short review of the 2 The DDS specification defines a sophisticated set of so-called Quality of Service Policies (QoS Policies) that enable to tune the DDS with respect to things like transport reliability and transport priority, storage durability and history depth. The DDS is a powerful service that enables to build fault tolerant systems where applications can join and leave the system in an ad-hoc way. The DDS is also very suitable as a common backbone for the integration of different systems. The initial release of the OMG DDS standard specifies the API enabling the portability of applications between different DDS implementations. Standardization of the interoperability or wire protocol is in progress, enabling the interoperability be

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