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An investigation into Event-B methodologies and timing constraint modelling

An investigation into Event-B methodologies and timing constraint modelling
An investigation into Event-B methodologies and timing constraint modelling
In the domain of formal modelling and verification of real-time safety-critical systems, our focus is on complex - i.e. nested, interdependent and cyclic - timing constraints. We strengthen the pallet of modelling tools and techniques to describe and verify timing properties in such real-time systems.
Our contribution builds on Event-B - a formal language for systems modelling, based on set theory and predicate logic. The language has the advantage of mechanised proof and tackles system complexity through a stepwise refinement.

The foundation of our scheme - a notion of a timing interval - is a higher level abstraction in terms of statemachine and formal timing interval specification. It can formally bind together several related timing requirements, expressed in delay, deadline and expiry concepts. To support the timing interval abstraction through the Event-B based refinement method, we present five compositional refinement transformations: Sub-Interval, Alternative, Abort-to-Response, Single-to-Multi and Retry. The timing interval and its refinement transformations use a template-based generative scheme for the transformation of timed models - specified with state machines and timing interval - to Event-B. We provide a workflow and a recommended convention for modelling and graphically representing a timing interval and its refinement transformations in state machine diagrams. The modelling of a timing interval and its refinement transformations process is automated with our tool - tiGen.

Finally, we validate our approach and the recommended development workflow in three case studies. The results show that our timing interval can be developed through multiple levels of refinement. The process of modelling and proving is mostly automated.
Event-B Method, Formal Methods, Timing Constraints, state machine, iuml, tigen, Rodin, real time systems, safety critical
University of Southampton
Sulskus, Gintautas
3bb073ba-b3d9-448c-8251-cbeaa02e22d6
Sulskus, Gintautas
3bb073ba-b3d9-448c-8251-cbeaa02e22d6
Poppleton, Michael
4c60e63f-188c-4636-98b9-de8a42789b1b
Rezazadeh, Abdolbaghi
ab1aeb76-9d41-4b46-820c-cc66b631cb99

Sulskus, Gintautas (2017) An investigation into Event-B methodologies and timing constraint modelling. University of Southampton, Doctoral Thesis, 272pp.

Record type: Thesis (Doctoral)

Abstract

In the domain of formal modelling and verification of real-time safety-critical systems, our focus is on complex - i.e. nested, interdependent and cyclic - timing constraints. We strengthen the pallet of modelling tools and techniques to describe and verify timing properties in such real-time systems.
Our contribution builds on Event-B - a formal language for systems modelling, based on set theory and predicate logic. The language has the advantage of mechanised proof and tackles system complexity through a stepwise refinement.

The foundation of our scheme - a notion of a timing interval - is a higher level abstraction in terms of statemachine and formal timing interval specification. It can formally bind together several related timing requirements, expressed in delay, deadline and expiry concepts. To support the timing interval abstraction through the Event-B based refinement method, we present five compositional refinement transformations: Sub-Interval, Alternative, Abort-to-Response, Single-to-Multi and Retry. The timing interval and its refinement transformations use a template-based generative scheme for the transformation of timed models - specified with state machines and timing interval - to Event-B. We provide a workflow and a recommended convention for modelling and graphically representing a timing interval and its refinement transformations in state machine diagrams. The modelling of a timing interval and its refinement transformations process is automated with our tool - tiGen.

Finally, we validate our approach and the recommended development workflow in three case studies. The results show that our timing interval can be developed through multiple levels of refinement. The process of modelling and proving is mostly automated.

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Submitted date: 13 July 2017
Published date: September 2017
Keywords: Event-B Method, Formal Methods, Timing Constraints, state machine, iuml, tigen, Rodin, real time systems, safety critical

Identifiers

Local EPrints ID: 413746
URI: http://eprints.soton.ac.uk/id/eprint/413746
PURE UUID: d81c43e0-4b9b-435d-b42f-9e5649360ee6
ORCID for Abdolbaghi Rezazadeh: ORCID iD orcid.org/0000-0002-0029-469X

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Date deposited: 04 Sep 2017 16:30
Last modified: 25 Jun 2020 00:29

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