Modelling System of Systems Interface Contract Behaviour

Oldrich Faldik
(Mendel University, Brno, Czech Republic)
Richard Payne
(Newcastle University, Newcastle upon Tyne, United Kingdom)
John Fitzgerald
(Newcastle University, Newcastle upon Tyne, United Kingdom)
Barbora Buhnova
(Masaryk University, Brno, Czech Republic)

A key challenge in System of Systems (SoS) engineering is the analysis and maintenance of global properties under SoS evolution, and the integration of new constituent elements. There is a need to model the constituent systems composing a SoS in order to allow the analysis of emergent behaviours at the SoS boundary. The Contract pattern allows the engineer to specify constrained behaviours to which constituent systems are required to conform in order to be a part of the SoS. However, the Contract pattern faces some limitations in terms of its accessibility and suitability for verifying contract compatibility. To address these deficiencies, we propose the enrichment of the Contract pattern, which hitherto has been defined using SysML and the COMPASS Modelling Language (CML), by utilising SysML and Object Constraint Language (OCL). In addition, we examine the potential of interface automata, a notation for improving loose coupling between interfaces of constituent systems defined according to the contract, as a means of enabling the verification of contract compatibility. The approach is demonstrated using a case study in audio/video content streaming.

In Jan Kofroň and Jana Tumova: Proceedings International Workshop on Formal Engineering approaches to Software Components and Architectures (FESCA 2017), Uppsala, Sweden, 22nd April 2017, Electronic Proceedings in Theoretical Computer Science 245, pp. 1–15.
Published: 20th March 2017.

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