Self-adaptive Systems : An Introduction
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This document discusses self-adaptive software and provides examples of where static software failed to adapt. It describes the architectural elements of self-adaptive software, including services/components, a service registry, context manager, adaptation planner, component executor. It presents a case study of Tekio, a self-adaptive vision system, and experimental results showing it can adapt faster and more robustly than static implementations. Lessons learned are that modern software needs to adapt to context, rely on dynamically loaded services, and the adaptation planner is key to mapping context to configurations, while maintaining performance.
![Context Manager
Sensors Monitoring Metrics
(self)
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[NightFall, IntrusionDetected, Low Memory]
Context Configuration](https://image.slidesharecdn.com/selfadaptiveintro-120111183743-phpapp02/85/Self-adaptive-Systems-An-Introduction-23-320.jpg)
![Adaptation Planner
Context Configuration
[NightFall, IntrusionDetected, Low Memory]
Adaptation
Planner Set of Rules
[Infrared Camera, Face Detection, GarbageCollector]
System Configuration](https://image.slidesharecdn.com/selfadaptiveintro-120111183743-phpapp02/85/Self-adaptive-Systems-An-Introduction-25-320.jpg)
![Component/Service Executor
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Self-adaptive Systems : An Introduction
- 1. Self-adaptive Software An Introduction Sagar Sen Scientist, Ecole des Mines, Nantes, France
- 2. From? Ecole des Mines, Nantes City of Nantes (Rivers: Erdre, Loire|Population: 300,000)
- 4. The Gardner Heist in Boston 1. In 1990, two men dressed as police officers broke into the Isabella Stewart Gardner Museum in Boston 2. Stole a Vermeer, five Degas and three Rembrandts. 3. Estimated cost : $500 million only /-! 4. OBSERVATION: Total failure of motion sensor and video surveillance systems!
- 5. An Analysis... Software 1. Video surveillance software system did not capture clear images in the darkness of the night! 2. Security guard was gagged and tied up! Software requires human interaction! 3. No automatic communication to police! The thieves had all night to displace the art! Software did not adapt to the situation that the guard was in distress! 4. Reward $5 million!
- 6. The Ariane V501 Disaster • 4 juin, 1996, H0 at 08h35mn • The Ariane 501 launcher tilts brutally and is subject to extreme aerodynamic forces. • Self-destruct at H0+40sec. • Cost: 500 million dollars!
- 7. Qu'est-il arrivé? Overflow in BOTH (main+redundant) Inertial Reference Systems Sign (1) Exp (11) Mantissa (52) 0 63 62 52 51 0 CAST Sign (1) Value (15) 0 15 14 0 For example, 32769.445 leads to overflow in signed Int
- 8. The Earthquake in Japan • March 2011, Tohoku Earthquake close to Japan, Cost $235 billion • Number of crisis management services were engaged in parallel • Communication software helps engage ambulances, fire-fighters, medics, police...
- 10. Software is fragile! (Ariane!)
- 11. Software must adapt to context (Gardner Heist)
- 12. Software communicates with unreliable distributed services
- 13. Towards a Solution... Self-adaptive Software
- 14. Software should adapt at runtime
- 15. Architectural Elements in Self- adaptive Software
- 17. Software Function as a Service Biological Analogy Lifecyle of an Interacting cells in the body OSGi service with specific function
- 18. The Notion of a Dynamic Service/Module 1. A software module or service that can be unloaded/loaded at runtime. (Open heart surgery) 2. Each module has its own life-cycle, memory space 3. Modules have well-defined interfaces and communicate using messages 4. Stopping/replacing a module need not stop the software system! 5. Available inherently in dynamic languages such as Python 6. Implemented in statically typed languages such as JAVA under the name Open Service Gateway Interface (OSGi)
- 19. Service Registry
- 20. Service Registry msg publishes subscribes Provider delivers Consumer msg
- 21. Service Registry Biological Analogy Gene Expression vs. Subscribing to and Using Service Registry vs. DNA a Service
- 22. Context Manager
- 23. Context Manager Sensors Monitoring Metrics (self) Context Manager [NightFall, IntrusionDetected, Low Memory] Context Configuration
- 24. Context Manager Biological Analogy Night Fall!
- 25. Adaptation Planner Context Configuration [NightFall, IntrusionDetected, Low Memory] Adaptation Planner Set of Rules [Infrared Camera, Face Detection, GarbageCollector] System Configuration
- 26. Adaptation Planner Biological Analogy External/Internal Action Stimulus decision
- 27. Component/Service Executor [Infrared Camera, Face Detection, GarbageCollector] System Configuration 1 2 subscribe Component Executor 3 service 4 execute
- 28. Component Executor Biological Analogy Taking Action!
- 29. Tekio: A Self-adaptive Vision System With Santiago Hurtado, Colombia
- 30. Tekio: A Self-adaptive Vision System
- 32. Example Execution Intrusion Detection Face Detection
- 33. Simple Demo
- 34. Is Tekio good enough?
- 35. Experimental Questions Q1: Is Self-adaptation in Tekio fast? Q2: Is Self-adaptation in Tekio robust?
- 36. Experimental Setup Measurements 1. Throughput in Frames per second (FPS) 2. Memory usage in % 3. CPU usage in % 4. Settling time in seconds (time required to execute normally after adaptation) Machine: iMac with the Intel Core i3 Processor of 3.06GHz and 4GB 1333 MHz DDR3.
- 37. Comparison of Tekio to Static Implementation
- 38. Stress Testing
- 39. Lessons Learned?
- 40. Lessons Learned 1. Modern software must adapt to context. Eg. Gmail docs on context such as desktop, mobile phone, geography, language, local ads. 2. Building a self-adaptive system relies of services that can be loaded dynamically. 3. The adaptation planner is a key component that maps context to a system configuration based on rules. 4. Self-adaptive systems need to be performant compared to traditional software. As seen in Tekio.
- 41. Thank you.