OSGi: A Service-Oriented Infrastructure for Smart HomeReference
R. S. Hall and H. Cervantes, "Challenges in Building
Service-Oriented Applications for OSGi," in IEEE
Communications(Impact Factor=2.406), vol. 42, May 2004. OSGi
Alliance, OSGi Service Platform Technical Whitepaper 3.0, July
2004. Reporter Chun-Feng Liao Apr 4,2005
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AgendaIntroductionHow OSGi related to E-Home ?
OSGi Component ModelBundle
Container Component Model Standard Services Definition
Example: Home Security System DiscussionAvailable Open Source
ImplementationsOscar Demo
How can we use OSGi ?
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OSGi Target Market : E-HomeThe initial target market of OSGi is
home service gateways. Assume all houses contain a home area
network, and nearly all household devices are connected. Now OSGi s
vision is expanded to the automobile environment.Service Provider
OSGi Platform
OSGi Platform
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Residential GatewayGateway
Image Source:R. S. Hall and H. Cervantes, "Challenges in
Building Service-Oriented Applications for OSGi," in IEEE
Communications, vol. 42, May 2004.
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IntroductionWhat is the major contributions of OSGi Service
Platform?Deal with the delivery of managed services into networked
environments of embedded devices.Container Component Model Standard
Services Definition
What are the key elements of OSGi?1. Lightweight container
component model for bundles. 2. Standard services
OSGi(Service-Oriented) : Dynamism Substitutability
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Autonomous Service Discovery and BindingLocal OBR (Oscar Bundle
Repository) XX XX XX A1 XX A2 C XX XX XX XX XX XX Remote OBR /
Internet OSGi A3 C1 B1 B2 B A
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Container Component Model
LWC (Lightweight Container)Apache Avalon Framework (type 1 IoC)
Spring Framework (type 2 IoC) Pico Container (type 3 IoC) OSGi
Service PlatformECU Proposal
HWC (Heavyweight Container)MIDP (J2ME) EJB (J2EE)
MicrokernelJMX JbossOSGi
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ECUG A P B S S Component Adaptation Framework Light Weight
Container Infrastructural ServicesResource Allocating Services
Auditing Networking Configuration Monitoring Services Services
Services Services
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Bundle (Component in OSGi)Physical ViewA java-based jar file.
Can not run without container (how to do unit testing ?)
Logical ViewService provider or consumer. Can publish,
discover(?) or bind to another service.
Need not take care of lifecycle issues.Management tasks are done
by OSGi platform.
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Bundle Lifecycle
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OSGi ApplicationsA typical OSGi application is built around an
extensible core. Provide heigher-level application-specific
services.OSGi Applications (Bundle)Auth Services Bundle YYY
Services Bundle XXX Services Bundle Http Services Bundle ZZZ
Services Bundle Mail Services Bundle Management Bundle Log Services
Bundle
Standard Services (Cross cutting concerns)
OSGi Service Platform
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http://research.microsoft.com/adapt/MSBNx/
Example: A Home Security Systemactive
passive event Bayesian Network poll
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DiscussionOSGi, UPnP, HAVi and Jini. Open Source OSGi
ImplementationsOscar (R.S.Hall, Grenoble Univ. ) Knopflerfish
(Gatespace) Physalis (.NET Compact Framework)
How can we make use of OSGi?
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Device
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Context
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Agents
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Backup
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Web Services-Technical View
Image Source: Heather Kreger
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Dependency InjectionDependency Injection provide help us to
implement the IoCInterface Injection (type 1 IoC) Setter Injection
(type 2 IoC) Constructor Injection (type 3 IoC)
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Client Course TeachingCourse course teacherUse Relationship
injection Instance relationship
Teacher Client
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Factory ClassFactory factoryCourse TeachingCourse course teacher
Teacher TeachingCourseFactory
ClientUse
Relationship injection Instance relationship
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Dependency Injectionlightweight containerconfigCourse
TeachingCourse course teacher Teacher Lightweight container xml
ClientUse
Relationship injection Instance relationship
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Design by InterfaceCourseImpl_A
Course TeachingCourse course teacher
CourseImpl_B
Client
Use Relationship injection Instance relationship
Teacher Lightweight container xml
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