1. WebSockets and Equinox OSGi in a Servlet Container
Nedelcho Delchev [SAP]

2. Who am I?
I am Development Architect in HANA Cloud Platform Core team in the area of extensions for large enterprises in the cloud.
Project lead of Eclipse Dirigible – a Cloud Development Platform project that provides full-fledged capabilities for developing, running and operating cloud applications –

3. ServletBridge Architecture
Server-Side Equinox:
Equinox in a Servlet Container:
What is OSGi in Servlet Container series by Angelo Zerr:

4. ServletBridge Component
Web Container
Servlet Bridge
OSGi Servlet
OSGi
Servlet

5. Websockets

6. WebSocket Bridge in WebApp

7. WebSocket Servlet in OSGi

8. Registering OSGi WS Servlet in the BundleActivator

9. Websocket in Web Container
ServletBridge [Registered OSGi WS Servlets]
OSGi WS Servlet
Websocket Servlet 2 1 3
1. Registering 2. Lookup 3. Communication

10. Classloaders visibility (launch.ini)
osgi.parentClassloader=fwk osgi.contextClassLoaderParent=fwk org.osgi.framework.system.packages.extra=javax.websocket,javax.websocket.server,javax.mail,javax.mail.internet,osgi.websockets.bridge

11. Authentication and Authorization
Logged-in User
Is User in Role?

12. “Hello World” via Websocket channel
Clone –
Build & Deploy
Access & Login -
Create WS Client e.g. in Chrome –
> var logSocket = new WebSocket("ws://localhost:8080/log");
Inspect Frames in Network/WS
Access from a second browser -
Send a message from WS client and receive the echo - logSocket.send("Hello from Client!");

13. Real-world examples
By Eclipse Dirigible

14. Log Console

15. Terminal

16. Debug

17. Scripting Services

18. Recap You learnt that you can utilize WebSockets in a OSGi environment
You learnt how to do it via the ‘bridge’ concept
You learnt that it is not just pure theoretical thing, but it is already used in the real world projects
You got it re-confirmed OSGi is cool
You learnt about existence of an OSGi based Cloud Development Platform project called Eclipse Dirigible:

19. Thank You!

20. References