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Towards Self-Adaptive Software Systems

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The document discusses engineering self-adaptive software systems using feedback loops. It outlines challenges in monitoring and assessing dynamical systems using feedback loops to satisfy requirements. Key challenges include defining relevant indicators, understanding why they change, prioritizing them, handling uncertainty, and making feedback loops explicit in system design and analysis.

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TOWARDS SELF-ADAPTIVE SOFTWARE-INTENSIVE SYSTEMS Hausi A. Müller University of Victoria, Canada Choose Forum 2008 Bern, Switzerland December 8, 2008
MY BACKGROUND ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ENGINEERING SELF -ADAPTIVE SYSTEMS High degree of dynamism Goals / policies change at run-time Validation and verification performed at run-time Agility at run-time Müller, H.A.: SEAMS 2008 Panel—Report from Dagstuhl Seminar 08031 on Engineering Self-Adaptive Systems
VERY HIGH EXPECTATIONS FOR SELF-ADAPTABILITY ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
OUTLINE ,[object Object],[object Object],[object Object],[object Object],[object Object]
RISE OF THE DYNAMIC VALUE SET ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Steve Mills, VP IBM Software Group: The Future of Business, White Paper, June 2007
IBM GLOBAL SERVICES SERVICE INTEGRATION MATURITY MODEL (SIMM) http://www.ibm.com/developerworks/webservices/library/ws-soa-simm/ ,[object Object]
SELF-ADAPTIVE SYSTEMS: ANTICIPATED AND UN-ANTICIPATED ADAPTATION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARCHITECTURE-CENTRIC VS. CONTROL-CENTRIC SOA ORCHESTRATION Control-Centric Design and Views
KEY PERFORMANCE INDICATORS (KPI) AND QUALITY-OF-SERVICE INDICATORS XML and Web Services Unleashed, SAMS Publishing Instrumenting all Levels for Indicators
SOA GOVERNANCE ,[object Object],[object Object],[object Object],G. Lewis, D. Smith: SOA and its Implications for Software Maintenance and Evolution, ICSM FoSM 2008
SOA GOVERNANCE TYPES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],G. Lewis, D. Smith: SOA and its Implications for Software Maintenance and Evolution, ICSM FoSM 2008
FEEDBACK LOOPS ARE AT THE HEART OF DYNAMICAL SYSTEMS
Continuous Evolution Problems
ULS CHALLENGES APPLY TO SOA ,[object Object],[object Object],[object Object],[object Object],[object Object],L. Northrop et al.: Ultra-Large-Scale Systems: The Software Challenge of the Future, SEI Tech Report, June 2006
SPECIFIC CHALLENGES IN GOVERNANCE SYSTEM MONITORING AND ASSESSMENT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SPECIFIC CHALLENGES FOR SYSTEM MONITORING AND ASSESSMENT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SPECIFIC CHALLENGES FOR SYSTEM MONITORING AND ASSESSMENT ,[object Object],[object Object],[object Object],[object Object],[object Object]
BRIEF SIDE NOTE ... COMPLIANCE VS. CONFORMANCE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Keep in mind: Whenever we talk about “compliance,” we often really mean “conformance.”
MONITORING DYNAMICAL SYSTEMS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
CHANGE OF PERSPECTIVE ,[object Object],[object Object],With adaptive systems and feedback loops  How? The system shall do this … but it may do this … as long as it does this …
BIOLOGICAL SYSTEMS ,[object Object],[object Object],[object Object],n-dimensional viability zone equilibrium
MOST FAMOUS FEEDBACK SYSTEM AUTONOMIC NERVOUS SYSTEM (ANS) ,[object Object],[object Object],[object Object],[object Object],[object Object],Temperature Heart rate Breathing rate Blood pressure Blood sugar Pupil dilation Tears Digestion Immune response Decide Resource Measure Control Monitor and regulate
FEEDBACK SYSTEMS ,[object Object],[object Object],[object Object]
APPROACH: FEEDBACK LOOP Dobson, S. et al.: A Survey of Autonomic Communications. ACM Trans. on Autonomous and Adaptive Systems (TAAS) 1(2):223-259 (2006)
CONTROLLER AS AN AUTONOMIC ELEMENT
HIERARCHY OF AUTONOMIC ELEMENTS TO ORCHESTRATE INDICATORS; ACRA IBM: An Architectural Blueprint for Autonomic Computing, 4th Ed. (2006)
REALIZATION OF A DYNAMIC ARCHITECTURE ,[object Object],Hellerstein, Diao, Parekh, Tilbury: Feedback Control of Computing Systems. John Wiley & Sons (2004)
REALIZATION OF A DYNAMIC ARCHITECTURE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Hellerstein, Diao, Parekh, Tilbury: Feedback Control of Computing Systems. John Wiley & Sons (2004)
ADAPTIVE CONTROL ,[object Object],[object Object],[object Object],[object Object]
SYSTEM IDENTIFICATION MODEL BUILDING ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
MODEL REFERENCE ADAPTIVE CONTROLLERS—MRAC ,[object Object],[object Object],[object Object],[object Object],[object Object]
MODEL REFERENCE ADAPTIVE CONTROLLERS—MRAC FB
MODEL REFERENCE ADAPTIVE CONTROLLERS—MRAC
MODEL IDENTIFICATION ADAPTIVE CONTROLLERS—MIAC ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
MODEL IDENTIFICATION ADAPTIVE CONTROLLERS—MIAC FB
MODEL IDENTIFICATION ADAPTIVE CONTROLLERS—MIAC
MIAC AND MRAC ARCHITECTURES FOR DYNAMICAL COMPUTING SYSTEMS ,[object Object],[object Object],[object Object],[object Object],[object Object]
MAINTAINABILITY CONCERNS ,[object Object],[object Object],Control-Centric Design and Views
RESEARCH CHALLENGES ,[object Object],[object Object],[object Object]
RESEARCH CHALLENGES: MODEL CONSTRUCTION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RESEARCH CHALLENGES: MANAGING AND LEVERAGING UNCERTAINTY ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RESEARCH CHALLENGES: MAKING CONTROL LOOPS EXPLICIT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
CONCLUSIONS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
TO PROBE FURTHER ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
MARK YOUR CALENDARS HOPE TO SEE YOU ALL IN CANADA IN 2009 ,[object Object],[object Object],[object Object],[object Object]
SEAMS 2009 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
VISSOFT 2009 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
QUESTIONS, FEEDBACK, COMMENTS, IDEAS, AHA-EXPERIENCE, INSIGHTS, ...

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