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Enhancing Self-Adaptive Software: Reconciling Life-Cycle Activities for Evolution and Adaptation

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This document presents a detailed exploration of life-cycle activities for self-adaptive software, highlighting their differences from traditional system life-cycle activities. The study emphasizes the evolving relationship between development time and run-time, addressing critical challenges such as understanding adaptation logic and defining tailored processes. Key observations include the need for a process element library that categorizes process dimensions, such as online versus offline, and autonomous versus human-assisted adaptations. This work contributes to a better understanding of how self-adaptive systems can achieve long-term evolution through effective process integration.

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Enhancing Self-Adaptive Software: Reconciling Life-Cycle Activities for Evolution and Adaptation

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  1. Process – Group C

  2. Participants • Luciano • Nelly • Bojan • Alessandra • Paola • Oscar • Sooyong • Dennis • Thomas • Rogerio • Jesper

  3. Fact sheet • Name: Reconciling Software life-cycle activities • Hypothesis: Life-cycle activities for self-adaptive software are different from activities known from life-cycle activities for traditional systems. • Observations: • The traditional separation of development time and runtime blurs – cmp. with Group A’s work. • Spirals • Long-term evolution • Short-term adaptation • Challenge: Understanding the relationships

  4. What we know Self-adaptation (evolution) requires that certain process elements are available at run-time • (Some) Understanding of • System • Goals • Environment • Dimensions • Evolution types • Foreseeable • Unforeseeable • Stakeholders Self-adaptive software system Adaptation logic monitor adapt monitor Domain logic Controllable software monitor effect Environment Non-controllable software, hardware, network, physical context

  5. What we(?) want to do!(long-term) • For a given Self-adaptive System; understand, define, and instantiate a tailored process, • Process Roles • Work Products • Activities • Process Element Librarywhere Dimensions define variants • [Life-time] Design time – Deployment time – Run-time • On-line – Off-line • Autonomous – Human Assisted – … Manual • Foreseeable - Unforeseeable Process Element Library Process

  6. Dimensions • [Life-time] Design time – Deployment time – Run-time • (@run-time) On-line – Off-line, • On-line, adaptation competes with a base-level system over resources. Alt. services provided by the system. • Off-line • Synchronous – Asynchronous • [Degree of automation] Autonomous – Human Assisted – … Manual • Foreseen – Unforeseen • Level of process support required, @run-time, required to perform adaptations • Monitored vs. unmonitored • Controlled vs. uncontrolled • Open vs. closed-loop • Other sources • Taxonomy unanticipated evolution • Modeling dimensions in SEfSAS 09

  7. Approach • Process Specification Framework (Reasoning) • Collect application specific scenarios • Development scenarios • Behavioral Scenarios • Perspectives • User, Developer, … • Case-study – Automatic workarounds

  8. Case study • Develop SPEM models for two processes • Traditional Evolution • Automatic Workarounds • SPEM models • Activity diagrams • Object model • Compare • Connect!

  9. Evolution (Trad) – Activity Diagram

  10. Evolution (Trad) – SPEM Static

  11. Automatic Workarounds - Activity

  12. Automatic Workarounds – SPEM Static • Library Elements • Development time instantiations • Run time instantiation Application Specializations

  13. Challenges • SPEM modeling • Process descriptions – Collaborations • Instances UML Class diagram • Mixin life-cycle phases • Stereotypes • UML profile • Understand sub-process integration • Models – Degree of reflection depends upon the the expressiveness of models • Observability/Controllability of the base-level application or adaptive-subsystems • Monitored, Controlled variables • Structural/Behavioral reflection • Reflective processes, modify process models@runtime • Instantiation process • COST function • Element Selection/Instantiation • Distribute responsibilities over the life-cycle • What should drive the developer into seeking self-adaptive behavior? • And… • Group A – Example of distribution challenge incl. tradeoff • Group B – Design Spaces input to process instantiation • Group D - Decentralization

  14. Remember…nota Waterfall!

  15. Sub-Process Integration e.g. Dependencies between elements in different life-cycle phases Capture and Understand the relationships!

  16. Reflective Processes

  17. Process Element Library System Model Evolution types Marking Perspectives Other dimensions Process Instantiation

  18. Process Instantiation Activities • Process Element Library • Develop Elements • Classify (Dimensions) • Instantiation • Selection using dimension attributes • Distribute responsibilities over the life-cycle and reflective sub-systems • Verification • Process Metrics @run-time

  19. Work ahead • Workarounds • Extend with more on development time • Interaction diagrams • Plastic • On-line/off-line • Development/Deployment (adaptation)/Run-time • Foreseen/Unforeseen

  20. Participants • Jesper Andersson • Luciano Baresi • Nelly Bencomo • Bojan Cukic • Alessandra Gorla • Paola Inverardi • Oscar Nierstrasz • SooyongPark • Dennis B. Smith • Thomas Vogel • Rogerio de Lemos

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