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CelsiusTech

CelsiusTech. A Case Study in Product Line Development. What are the advantages?. Able to design two systems with the manpower of one Later projects took a third of the time Later projects were much more predictable Able to move into new business areas. Old organization.

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CelsiusTech

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  1. CelsiusTech A Case Study in Product Line Development

  2. What are the advantages? • Able to design two systems with the manpower of one • Later projects took a third of the time • Later projects were much more predictable • Able to move into new business areas

  3. Old organization • Mk2.5 Project Family Manager • Command and control • Tracking • Communications • Operator’s console • Base system • Systems integration

  4. New Organization • SS2000 General Program Manager • Architecture team • Product line software development • C3 • HCI • Weapons • Fundamental Services • Customer project management • Integration and CM team

  5. Architectural Views • COOB • Layered architecture • Module decomposition: system functions and function groups • Models?

  6. COOB • Processes that produce a new result do not tell other components directly, but tell the COOB. • Processes that need to know when data changes will register with COOB. • COOB notifies processes when data changes. • Processes communicate using typed messages

  7. Layered Architecture • General applications • Common applications • Fundamentals • Database, Diagnostics, Configuration, etc. • Base System 2000 • OS-2000 • LAN, IPC • Hardware

  8. Layered Architecture • General applications • Target tracking • Fire control • ECM, ASC • Common applications • Ships information • Picture compilations • Fundamentals • Base System 2000

  9. Module Decomposition • System functions – at one layer • System functions group • Any level • Product of single (large) team • About 30 • Has its own requirements document • Main configuration unit

  10. Architectural Qualities • Modifiability • Performance • Reliability, availability and safety • Testability

  11. Modifiability • COOB, layers, function groups • Software written to be location independent • Ada generics • Heavy use of parameterization

  12. Performance • Strict network traffic protocols • Concurrent processes • Location independent processes, can be moved for load balancing • COOB by-passed for high-volume transactions • COOB sends data only when altered

  13. Reliability, Availability and Safety • Redundant LAN • Fault-tolerant software • Ada exceptions • Location independent software • Strict ownership of data – no multi-writer race conditions

  14. Testability • Interfaces with typed messages • Strict data ownership • Semantic coherence of elements • Strong interface definitions

  15. Conclusion • Reuse doesn’t come with the compiler • Reuse requires • Organization • Domain knowledge • Architecture

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