Mission Operations Reference Model. Draft ... - CCSDS

DRAFT RECOMMENDED PRACTICE FOR MISSION OPERATIONS REFERENCE MODELThe layering of the message transport, MAL, MO Services and the service provider andconsumer is shown in figure 2-2 (each layer builds upon the layers below).Service ConsumerServiceConfigurationConfiguration interrogationService invocationService responseHistory populationHistory observationServiceHistoryService ProviderMission Operations Services LayerMessaging Abstraction LayerMessaging TechnologyFigure 2-2: Service Stack ViewNOTE – A benefit of implementing multiple services over a message abstraction layer isthat it is easier to bind them to different underlying technologies and protocolencodings. All that is required is an ‘adapter’ layer between the MAL and theunderlying protocol to enable all services over that technology. This can be eitheran implementation of the MAL that is bound to a specific technology or animplementation that supports multiple technologies. Hence the same service canbe implemented over ground-based network technologies and middleware, or itcould even be carried across the space link itself.The services, in the form of standard language-specific APIs, themselves providethe ‘plug-and-play’ interface for applications, allowing them to be integrated anddeployed wherever is appropriate for the mission.CCSDS 520.1-R-1 Page 2-4 October 2009