Mitigating the obsolescence of quality specifications models in service-based systems

Romina Torres, Nelly Bencomo, Hernan Astudillo

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Citations (Scopus)

Abstract

Requirements-aware systems address the need to reason about uncertainty at runtime to support adaptation decisions, by representing quality of services (QoS) requirements for service-based systems (SBS) with precise values in run-time queryable model specification. However, current approaches do not support updating of the specification to reflect changes in the service market, like newly available services or improved QoS of existing ones. Thus, even if the specification models reflect design-time acceptable requirements they may become obsolete and miss opportunities for system improvement by self-adaptation. This articles proposes to distinguish "abstract" and "concrete" specification models: the former consists of linguistic variables (e.g. "fast") agreed upon at design time, and the latter consists of precise numeric values (e.g. "2ms") that are dynamically calculated at run-time, thus incorporating up-to-date QoS information. If and when freshly calculated concrete specifications are not satisfied anymore by the current service configuration, an adaptation is triggered. The approach was validated using four simulated SBS that use services from a previously published, real-world dataset; in all cases, the system was able to detect unsatisfied requirements at run-time and trigger suitable adaptations. Ongoing work focuses on policies to determine recalculation of specifications. This approach will allow engineers to build SBS that can be protected against market-caused obsolescence of their requirements specifications.

Original languageEnglish
Title of host publication2012 2nd IEEE International Workshop on Model-Driven Requirements Engineering, MoDRE 2012 - Proceedings
Pages68-76
Number of pages9
DOIs
Publication statusPublished - 2012
Event2012 2nd IEEE International Workshop on Model-Driven Requirements Engineering, MoDRE 2012 - Chicago, IL, United States
Duration: 24 Sep 201224 Sep 2012

Publication series

Name2012 2nd IEEE International Workshop on Model-Driven Requirements Engineering, MoDRE 2012 - Proceedings

Other

Other2012 2nd IEEE International Workshop on Model-Driven Requirements Engineering, MoDRE 2012
Country/TerritoryUnited States
CityChicago, IL
Period24/09/1224/09/12

Keywords

  • Quality of Service
  • Requirements-awareness
  • dynamically adaptive systems
  • [email protected]
  • requirements model
  • service-based systems

ASJC Scopus subject areas

  • Software
  • Modelling and Simulation

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