OSGi & Other Technologies Peter Kriens, aQute OSGi Fellow

OSGi & Other Technologies Overview OSGi's Place In The World The OSGi Service Platform? Java & OSGi UPnP & OSGi Microsoft .NET So Why OSGi?

OSGi's Place In The World Building systems is hard Connected systems are even harder to build Distribution adds failure points Difficult to fix bugs remotely Upgrades How can the devices on a network inter-operate? New devices New services New standards It is a giant puzzle! The keyword is extendibility

OSGi's Place In The World The OSGi specifications define a Java environment, just like an operating system, for networked services. A networked service: Can be deployed over a network Adds a variety of functions to the device May be managed, under the control of an operator Intended for all types of devices as long as they are networked Mobile phones, Gateways, PDAs, desktops, cars, and enterprise servers

The OSGi Service Platform Operating System & Hardware Java VM Bundle OSGi Framework Bundle Management Bundle Bundle Bundle Bundle Protocol Stack OSGi Service

System Class Libraries Java & OSGi Operating System Java VM System Class Libraries OSGi Application Library Operating System Java VM The Application Crypto- graphy UPnP Direc- tories Imaging Mail Media FW SQL GUI Distri- buted Comm Ports Security TCP/IP JTAPI 3D Web Server Math Speech Blue- tooth XML USB More than a programming language … Standardized interfaces: Multiple implementations Access to tens of thousands of software libraries Application is: start - stop Is this sufficient for networked devices? OSGi Specifications provide: An in-VM application model. A Service Registry for service discovery A delivery format The OSGi fills a gap in Java

UPnP & OSGi Universal Plug aNd Play A standard to let appliances communicate Functions Device/Service Discovery standard: SSDP Remote Execution: SOAP Device Interface Descriptions: WSDL Allows for pre-defined, device resident, and generated GUIs Device OSGi Based Device

Sounds awfully similar to OSGi??? UPnP & OSGi Sounds awfully similar to OSGi??? Confused?

UPnP & OSGi OSGI OSGI UPnP defines a communication protocol OSGi defines an execution environment Device Bundle/Application code Service OSGI OSGI

UPnP & OSGi The OSGi Service Platform is a perfect execution environment for UPnP enabled services! The OSGi Alliance has standardized a UPnP Service that makes empowering a device with UPnP very easy The Service Platform could become available as a standardized UPnP Device in the future A marriage made in heaven! OSGI OSGI

:| :) :) :) OSGi & .NET :-( :| Java captured significant market share in the 90s because Java: Is easier to program than C++ Has robust automatic memory management Provides a security model Microsoft noticed the advantage and "adopted" Java However, they optimized their implementation for Windows This invalidated the "write once, run everywhere" mantra Obviously, SUN was not smiling :-( >:( ;-) :-)

:( :| OSGi & .NET So SUN sued Microsoft Microsoft kept Java at Version 1.1 (Still today) The OSGi was founded to use Java with networked services Microsoft introduced .NET Based on exactly the same principles as Java Heavily optimized (and compatible with Windows) SUN extended Java with J2ME and J2SE Microsoft developed several products for .NET and renamed more products to .NET :| :) ;) .NET .NET :)

Common Language Specification Common Language Runtime OSGi & .NET .NET Framework Provides all of the technical advantages of Java, and more Has virtually the same characteristics Comprehensive range of products But lacks Dynamic Pluggable Remote Management Open specifications Optimizations for the myriad of niche applications C# 'VB' 'J#' 'C++' ... Windows XP or 2000 Embedded XP CE .NET Common Language Specification Common Language Runtime ADO.NET ASP.NET Windows Forms Applications Libraries COM Legacy

;) :) So Why OSGi? The non-proprietary nature of Java is future proof Multiple choices No party with market lock Large number of parties that make variations on the theme The OSGi service platform is complementary to many existing technologies A well defined run-time environ-ment for connecting devices The OSGi Specifications a unique remote deployment model Web Services level the playing field with .NET ;) :)

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