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Lookup NU author(s): Emeritus Professor Alexander RomanovskyORCiD
This paper proposes a new N-version programming (NVP) scheme which allows several caller tasks to jointly use components which are designed diversely. Diversity is applied here at the level of classes in such a way that several version classes (objects) are devel oped separately and independently, and are encapsulated into a diversely designed object. Such objects are to be implemented in a special stylised way to incorporate a controlling mechanism which would deal with task and version synchronisation, adjudication of version output parameters and states, faulty version recovery, etc. The general approach is demonstrated using Ada. We outline the characteristics of applications which benefit from using such NVP scheme, discuss the engineering of diversely designed objects and of the software which uses them and describe several possible extensions of the scheme.
Author(s): Romanovsky A
Publication type: Report
Publication status: Published
Series Title: Department of Computing Science Technical Report Series
Year: 2000
Pages: 15
Report Number: 691
Institution: Department of Computing Science, University of Newcastle upon Tyne
Place Published: Newcastle upon Tyne
URL: http://www.cs.ncl.ac.uk/publications/trs/papers/691.pdf
