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Enhancing Residential Gateways: OSGi Service Composition

Enhancing Residential Gateways: OSGi Service Composition. Consumer Electronics, IEEE Transactions /February 2007/Volume: 53,  Issue: 1 /On page(s): 87-95 學號 :69621045 學生 : 康郁伶. Outline-1. I. INTRODUCTION II. AN OSGI OVERVIEW III. COMPOSITION SCENARIO

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Enhancing Residential Gateways: OSGi Service Composition

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  1. Enhancing Residential Gateways: OSGi Service Composition Consumer Electronics, IEEE Transactions /February 2007/Volume: 53,  Issue: 1 /On page(s): 87-95 學號:69621045 學生:康郁伶

  2. Outline-1 • I. INTRODUCTION • II. AN OSGI OVERVIEW • III. COMPOSITION SCENARIO • IV. SPECIFYING OSGI SERVICE COMPOSITION: A BPELSTYLESOLUTION

  3. Outline-2 • V. PROBLEMS REVEALED: A SEMANTIC SOLUTION • VI. THE OWL-OS/OSGIFRAMEWORK • VII. A SEMANTIC SOLUTION FOR AUTOMATIC SEMANTICOSGI SERVICE COMPOSITION • VIII. DISCUSSION

  4. I. INTRODUCTION • (i) the communication among all devices in home is easy because it supports different widespread protocols • (ii) it defines a cooperative model where applications can dynamically discover and use services provided by others • (iii) it is possible a flexible remote management of these applications and the services they provide

  5. II. AN OSGI OVERVIEW

  6. III. COMPOSITION SCENARIO-1 • “At John's house, equipped with fire and intrusion detectors, there is a Home Security service. • (i) In case of fire, the service triggers the ringing alarm, unlocks the doors, calls the fire station and informs John by using the most appropriate device (mobile phone, car navigator, etc.) • (ii) In case of intrusion, the service locks the doors, calls the police station and also informs John.”

  7. III. COMPOSITION SCENARIO-2

  8. IV. SPECIFYING OSGI SERVICE COMPOSITION: A BPELSTYLESOLUTION • A. Overview of BPEL • B. Our proposal: a syntactic approach • C. Registering a OSGi composite service • D. Invoking a OSGi composite service • E. BPEL definition

  9. A. Overview of BPEL

  10. B. Our proposal: a syntactic approach • This composite service is registered in the framework not needing to be implemented by any bundle, i.e. it could be considered a virtual bundle. • a particularized BPEL Composition Engine is responsible for registering and executing OSGi composite services.

  11. C. Registering a OSGi composite service

  12. D. Invoking a OSGi composite service

  13. E. BPEL definition-1

  14. E. BPEL definition-2

  15. V. PROBLEMS REVEALED: A SEMANTIC SOLUTION • current OSGi specification is not enough to support the required flexibility: • (i) to find the most appropriate services and • (ii) to know how to interact with them automatically at run-time. • defined a semantic OSGi framework, coined OWL-OS/OSGi framework

  16. VI. THE OWL-OS/OSGIFRAMEWORK

  17. VI. THE OWL-OS/OSGIFRAMEWORK • A. Registering semantic OSGi services • B. Semantic discovery of OSGi services • C. Invoking OSGi services • allows the requester bundle to discover the name of the public method and the parameters in order to construct the invoking primitive

  18. VI. THE OWL-OS/OSGIFRAMEWORK

  19. VII. A SEMANTIC SOLUTION FOR AUTOMATIC SEMANTICOSGI SERVICE COMPOSITION

  20. VII. A SEMANTIC SOLUTION FOR AUTOMATIC SEMANTICOSGI SERVICE COMPOSITION • A. Semantic BPEL

  21. VIII. DISCUSSION-1 • Implement • Platform- OSCAR • ActiveBPEL engine • Protégé OWL API • We have implemented a semantic version of the OSCAR registry • Use Jess and JessTab plug-in

  22. VIII. DISCUSSION-2 • propose enriching the OSGi Service Registry with semantic descriptions, i.e. turning OSGi into a Semantic OSGi platform and allowing the semantic composition of service • With a semantic description of contexts, the system not only can react to that contexts in a better way, but we can also provide reasoning over contexts which improves the quality of the reacting activities.

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