Transcript 슬라이드 1
OSGi Service Platform Choon Oh Lee Today’s Content • About OSGi Service Platform • What it is, • Where it is used, • What features it provides are Before we start… • OSGi is not a middleware, but a specifications for technology. • Different industries can develop their own the OSGi technology based middleware. Introduction • The OSGi Service Platform is… – the optimal Java based application server for networked devices. • It’s scope is – – – – – – – standard non-proprietary software component framework. powerful model for co-existence of components in a single JVM. flexible deployment API that controls the life-cycle of applications. secure environment that executes applications in a sandbox. cooperative model where applications can discover and use services. Flexible remote management architecture. Number of standardized, optional services: HTTP, XML, IO, etc… Uses cases • Smart Phones (Nokia) – enables to extend platform features after manufacturing. – New application or API can be installed on mobile devices over air. – new business model of client middleware. • Smart Home (Siemens) – Central gateway for home automation. – Drivers(interfaces) and scenarios can be updated after initial sale. Uses cases • Eclipse (IBM) – Plugins installation without restart – New version 3.1 is built upon a OSGi Service Platform • Telematics (BMW) – Centralized service platform for automobile applications – Save costs by sharing platform – Dynamic updates of features. Key Features of the OSGi • Software Component Management • Remote Component Management • Secure Execution Environment • Cooperation Between Applications • Simplified Deployment • Dynamic Nature Software Component Management • Life-cycle management of applications – – – – JAR packaging of bundle (software component) Install bundle Start/stop bundle Update and Uninstall bundle • Advantage – Not fixed functionality from factory, – But capability to manage the code afterwards to customize device Remote Component Management • Remote management of application • OSGi provides higher level of abstraction of protocols like... – – – – – – OMA-DM SNMP CMISE CIM Telnet/ssh Etc… (유무선 단말기 관리) (네트워크 관리, 라우터나 허브에 사용) (공동 정보 시스템의 제어) (생산 관리) Secure Execution Environment • 1st level, VM security – Garbage collection – Exceptions • 2nd level, Java Language – Access modifiers for software components – Java 2 code based security: Permission for resources • 3rd level, OSGi Framework – Loosely coupled bundles Cooperation Between Applications • Existed application servers – MIDP(J2ME), J2EE, Avalon(Apache), PicoContainer, JMX, etc… – Closed container. – Application runs in isolation • OSGi – – – – Bundles contribute ‘code’ to others as well as ‘service’. Allows to use other bundles like using libraries. Service registry provided. Even among different vendors. Simplified Deployment • Java program is difficult to install – VM version, configurations, class-paths, parameters… – Hart to monitor applications • In OSGi, deployment process is simplified – Just using JAR – Deployment is performed hiding underlying differences. • Dynamic deployment on single JVM – Doesn’t need restart of JVM