At Oredev 2009, I presented 'dynamic deployment with OSGi': how can you leverage OSGi as a module system to make your development cycle more complete, including deployment and customer support? Be sure to check the slide notes; this presentation is intended as a background for me talking, so the slides themselves might not give you all information.

1. dynamic
deployment
with OSGi
Angelo van der Sijpt
angelo.vandersijpt@luminis.nl

9. how about modules?

10. Partitioning software
• modular, componentized, ...
• minimize dependencies
• consider rate of change
• minimize complexity
• maximize architected flexibility
• testability
• reuse

11. Reuse: copy/paste
• no clearly defined interface
• maintenance nightmare

12. Reuse: Object Oriented
• objects tend to work badly when
taken out of context

13. Reuse: Components
• components are black boxes
• clear “interfaces” with their

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17. OSGi technology is the dynamic module system for
Java™
OSGi technology is Universal Middleware.
OSGi technology provides a service-oriented, component-
based environment for developers and offers standardized
ways to manage the software lifecycle. These capabilities
greatly increase the value of a wide range of computers and
devices that use the Java™ platform.

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19. L3 - Provides a publish/find/
SERVICE MODEL bind service model to decouple
bundles
L2 - Manages the life cycle of
a bundle in a framework
LIFECYCLE without requiring the vm to be
restarted
L1 - Creates the concept of a
module (aka. bundle) that use
MODULE classes from each other in a
controlled way according to
system and bundle constraints
L0 -
Execution OSGi Minimum Execution
Environment Environment
CDC/Foundation
JavaSE

20. Module Layer
Module
Bundle Bundle Bundle Bundle
imports exports imports
exports exports exports
• unit of deployment org.apache.utils 1.0 org.apache.db 1.4
is the bundle i.e., a JAR org.apache.log 2.3 org.apache.utils 1.1
• share only your “interface”
packages
• automatic wiring based on version
ranges
Module

21. Life-cycle Layer
Life-cycle
install
installed
start start starting
resolved active
• Managed life cycle end uninstall
uninstalled
stopping stop
• States for each bundle;
• Allows updates of existing bundles.
• Dynamically install, start, update, and
uninstall
Life-cycle
Module

22. Service Layer
• OSGi framework
Service
promotes service
Log Database Prefs
publish publish
use
oriented interaction
publish use use
Bundle Bundle Bundle Bundle
pattern among
bundles
Service
Registry
publish find Service
Life-cycle
Service Service
Provider Requeste Module
interact

23. OSGi compendium
User Admin Initial Provisioning Wire Admin
XML Log Device Access
Measurement and
Parser State UPnP™
Preferences Device
Configuration Admin
Position
Metatype
Event Service Tracker
Admin
HTTP
IO Connector
Execution
Environment Spec
Declarative Services

24. Now we have components,
hurrah! Right?

25. “What version do you
have?”
“Can you look in the ‘about’
box?”
Now we install 037B.17.zip
“Did you have components,
we sent you?”
hurrah! Right?
What is the version of the
product, anyway?

26. how about configuration

27. Dynamic Deployment
• who uses what?
• what’s the history of a system?
• what’s the impact of this bug?
• integrate into build/test/QA cycle
• extensions, like (re)install and
license management

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• server only stores metadata, so no
IP in these repositories
• allows integration with different
repositories
• OBR, Maven (anything with a URL)

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37. Management Agent
• manages life cycle of
bundles
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40. Deployment Admin
• versioned set of artifacts
• transactional install/update
• fix packages provide deltas
• signing makes them secure
• extensible through resource
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41. demo

42. Angelo van der Sijpt
software engineer at Luminis / Apache ACE
committer
angelo.vandersijpt@luminis.nl
@_angelos

43. Further reading
• www.luminis-technologies.com
• cwiki.apache.org/ACE/
• cwiki.apache.org/FELIX/
• Or ask me:
angelo.vandersijpt@luminis.nl