1. OSGi & Other Technologies
Peter Kriens, aQute
OSGi Fellow

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

3. 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

4. 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

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

6. 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

7. 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

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

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

10. 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

11. :| :) :) :) 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
:-(
>:(
;-)
:-)

12. :( :| 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 :)

13. 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

14. ;) :) 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 ;) :)

15. ?
Questions