Object oriented abstractions for real-time distributed systems -: Foundation steps of Ada 95 purity and generics

As software development and maintenance costs rise, providing higher architectural language abstractions is an effective tool. This paper describes a key set of object oriented abstractions developed using the Ada 95 toolset, and discusses their applicability to distributed real-time command and control systems under development at Boeing. The abstraction concepts described build upon each other and eventually become high level tools. This helps to increase the leveraged development of real-time systems, especially as the product and customer configurations vary. This papers particular emphasis is on how to migrate to the new Ada 95 package (purity) categorization rules, and describes their use in the distributed Annex-E. A strongly typed, possibly remote, data subscription concept is described and then shown in it's use of the advanced Ada distributed generics capabilities. Client-server and distributed-object abstractions are also contrasted.