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Maintaining Terminal Integrity and Context-Aware Reconfiguration Johan Muskens (TU/e) Otso Virtanen (HIIT/BRU) Michel Chaudron (TU/e) Ronan Mac Laverty (NRC) Oslo 14.06.2004. Change terminal components according to e.g. location or other context information and maintain terminal integrity.

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  1. Maintaining Terminal Integrity and Context-Aware ReconfigurationJohan Muskens (TU/e) Otso Virtanen (HIIT/BRU)Michel Chaudron (TU/e) Ronan Mac Laverty (NRC)Oslo 14.06.2004

  2. Change terminal components according to e.g. location or other context information and maintain terminal integrity

  3. Outline • Robocop and Space4U • Context-Aware Reconfiguration • System Integrity Management • Scenario

  4. ITEA is a Eureka strategic cluster programme Consortium Space4U (2003-2005): • CSEM • FAGOR ELECTRODOMESTICOS • IKERLAN • Nokia • Philips Electronics Nederland B.V., • Technical University Eindhoven • Technical University of Madrid • Visual Tools Robocop (2001-2002): • CSEM • ESI • FAGOR ELECTRODOMESTICOS • IKERLAN • Nokia • Philips Electronics Nederland B.V., • SAIA – Burgess Electronics • Technical University Eindhoven • Technical University of Madrid • Visual Tools

  5. Robocop’s Aim that enables robust and reliable operation upgrading and extension component trading Define an open, component-based framework for the middleware layer in high-volume consumer devices

  6. Executable component Robocop Component Executable Component Resource Model Service Interface Simulation Model Provides Interface Documentation Functional Model Source Code Service 1 Service 2 … Executable Component Requires Interface Robocop Component Model • Robocop component • A set of models • Models can be executable • Models are composable

  7. Robocop Space4U Assisting Frameworks • Robocop Runtime Environment (RRE) keeps a registry of components available in terminal • Robocop Download Process (RCDP) makes it possible to download new components to terminal • Resource Management Framework, time requirements and quality of service management • Fault Management Framework WIP • Power Management Framework WIP • Terminal Management Framework WIP Context-aware reconfiguration and System Integrity Management done in this subtask

  8. Aim • Use existing Robocop mechanisms, mainly RobocopDownload Process and RRE Client API for downloading and switching of components • Develop a framework to keep the terminal in consistent shape and integrate this with context-aware reconfiguration framework Change terminal components according to e.g. location or other context information and maintain terminal integrity

  9. Our Solution… • Context-aware Framework • Context monitoring (e.g. probing the neighborhood for nearby devices) • A placeholder for context data (for depositing relevant information) • A blackboard flavoured solution for terminal suits our needs: • Consists of following components: • The blackboard, • Control and • Arbitrary number of knowledge sources. What should we deposit here?

  10. Models Deposited in Terminal • Terminal Management based on a model describing the current configuration of the terminal (self-model) Model of terminal and context in which it is used: C = T x U x  x E c = <t,u,,e> c  C, where Terminal (t), User (u), Time (), and Environment (e). Example: Terminal Model consists of: • Application layer model (bindings between the service instances etc.) • Middleware model (runtime information etc.) • Platform model (operating system etc.)

  11. High level set-up

  12. Terminal Manager Terminal Database • Monitoring • Diagnosis • Repairing • Script generation • Script execution • Provide rules • Provide solutions • Externalize Self-Model i.e. take a snap-shot of the current state • Basic Configuration Facilities Integrity Management Maintaining software integrity using 3 roles !

  13. Two Checks Developed • Blacklist of Services • In this case a component with a defect has been deployed to a set of terminals • Solution is to compare the snapshot of terminal models to know faulty components (or services) deposited in database • Missing services • Dynamically changing terminal. Problem: how to guarantee that all the services needed by some application X are available? • Solution is to compare the needed services by application X and the available services in the terminal. This information is recorded in the self model of terminal

  14. Scenario • User equipped with a Robocop terminal arrives to an airport. The context framework notices the new context • A timetable application needed in this context is downloaded via RCDP. This also updates one of the existing components in terminal • User executes the timetable application • Later on that day the user notifies some strange behavior in the terminal and therefore starts the check terminal status –procedure • Snapshot of the terminal models is sent to terminal manager server • Terminal manager server notifies that one of the components in terminal is blacklisted (i.e. the one downloaded in phase 2) by a developer • Repair script is generated and an updated version of the faulty component is downloaded and registered to the user’s terminal

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