Diversely Designed Classes for use by Multiple Tasks (2000)

Author(s): Romanovsky A

    Abstract: 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 developed 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.

      • Date: 01-03-2000
      • Journal: Ada Letters
      • Volume: 20
      • Issue: 1
      • Pages: 25-37
      • Publisher: ACM Press
      • Publication type: Article
      • Bibliographic status: Published

      Keywords: diversity, redundency, NVP, Ada

      Staff

      Professor Alexander Romanovsky
      Prof of Computing Science