This document discusses managing large distributed Eclipse server applications. It covers application stacks including servlets, JSP, OSGi bundles, and third party libraries. It also discusses integrating technologies like Jetty, Equinox, logging, clustering, provisioning, and the RAP framework. Specific challenges and solutions are provided around areas like integrating Jetty with OSGi, implementing a flexible logging system, using ZooKeeper for clustering and coordination, and leveraging p2 for provisioning. The document advocates contributing back through bug reports, patches, and code.

1. Managing large and distributed
Eclipse Server Applications
Gunnar Wagenknecht, AGETO

2. Application
Stack
Topics
Glue
Giving Back

3. Application
• E-Commerce
• Web Interface
• Batch Processing

4. Application
DE
UK CA

5. Eclipse Server Application
Servlet JSP Bundles ... ...
commons-
Jetty
Jetty Jasper
Jasper slf4j, ... 3rdParty
3rdParty p2
Launcher
logging, ...
Equinox
Operating System

6. Stack
Equinox
Jetty
p2
RAP
ZooKeeper, Solr, Logback,
Cassandra, Memcached

7. Bringing it all together!

8. Jetty & OSGi
Logging
Clustering
Glue
Provisioning
RAP

9. Jetty & OSGi
• How do I …
o make Servlets available
o for multiple tenants
o in different versions
o in different configurations
o without getting lost

10. Jetty & OSGi
• What we had …

11. Jetty & OSGi
• What we created …
OSGi Web App
OSGi Web App
OSGi Web App OSGi Bundle
OSGi Bundle
Servlets, Resources & Filters OSGi Bundle
Servlets, Resources & Filters
Session Isolation
Servlets, Resources & Filters
Session Isolation
Session Isolation
https://www.myshop.com/api https://my.ssldomain.com:8443/
https://www.myshop.com/api/v2 https://my.ssldomain.com:8444/
http://demo.na.mysystem.secret/ https://my.ssldomain.com:8445/

12. Jetty & OSGi
• What we created …
public class MyWebApp extends Application {
@Override
protected void doInit() throws CoreException {
getApplicationContext().registerServlet(…);
getApplicationContext().registerResources(…);
getApplicationContext().registerFilter(…);
}
}

13. Jetty & OSGi
• What we created …
osgi> http <cmd> [args]
ls … lists registered applications or providers
defineApp … defines an application
removeApp … removes an application definition
setAppProperty … sets/removes an application property
mount … mounts an application at the specified URL
unmount … unmounts the specified URL
start … starts an application
stop … stops an application

14. Jetty & OSGi
• What we created …
osgi> jetty <cmd> [args]
ls … list all connectors or certificates
addConnector … adds a connector
removeConnector … removes a connector
importCertificate … imports a certificate
removeCertificate … removes a certificate

15. Logging

16. Logging
SLF4J
JCL
JUL
log4j
.log

17. Logging
• What we had…

18. Logging
• Kind of what we wanted…

19. Logging
• What we ended up with…
JCL, JUL, log4j, .log & Co.
Syslog
Cassandra

20. Clustering
• What Equinox offers out-of-the-box…

22. Clustering
• Oh, may be Jetty…

24. Clustering
• What we wanted…
o group/membership
o configuration
o distributed
coordination
o don‘t write it, use it

25. Membership

26. Grouping

27. Configuration

28. Coordination

29. Clustering
• What we got… (finally!)
osgi> zk ls /mycloud
locks
prefs
queues
nodes

30. Provisioning
We got p2!
Easy. Next slide!

31. p2
Profile
IU
Agent
Director
Publisher

32. Provisioning

34. RAP
• What we wanted...

35. Looooong history in RAP

36. PDE
RAP
Giving
Jetty
Back
Gyrex

37. Bug Reports & Patches
• PDE
• RAP
• Jetty
• Equinox

38. Sometimes it works

39. Sometimes it doesn‘t

40. Sometimes it doesn‘t
Never give up!

42. Additional Pieces
• Distributed Processing
o Scheduler & Workers
o Quartz & Eclipse Jobs API
• Contextual Runtime
o Per tenant customization/configuration
o DI (provisional)

43. Playground…
• Running Orion
• EclipseLink JPA
• Caching Backends
• Dynamic Scaling

44. Q&A

45. gunnar@wagenknecht.org
linkedin.com/in/eclipseguru
twitter.com/eclipseguru