An Algebraic Framework for Runtime Verification

TL;DR

This paper introduces Algebraic Runtime Verification (ARV), a flexible framework that uses algebraic structures to quantify system resiliency during runtime, unifying qualitative and quantitative verification methods.

Contribution

The paper presents ARV, a novel algebraic framework for runtime verification that leverages monoidal and semiring structures to compute resiliency measures incrementally.

Findings

Effective in automotive case studies

Unifies qualitative and quantitative RV approaches

Demonstrates scalability and flexibility

Abstract

Runtime verification (RV) is a pragmatic and scalable, yet rigorous technique, to assess the correctness of complex systems, including cyber-physical systems (CPS). By measuring how robustly a CPS run satisfies a specification, RV allows in addition, to quantify the resiliency of a CPS to perturbations. In this paper we propose Algebraic Runtime Verification (ARV), a general, semantic framework for RV, which takes advantage of the monoidal structure of runs (w.r.t. concatenation) and the semiring structure of a specification automaton (w.r.t. choice and concatenation), to compute in an incremental and application specific fashion the resiliency measure. This allows us to expose the core aspects of RV, by developing an abstract monitoring algorithm, and to strengthen and unify the various qualitative and quantitative approaches to RV, by instantiating choice and concatenation with real-valued functions as dictated by the application. We demonstrate the power and effectiveness of our framework on two case studies from the automotive domain.