OSGi In A Nutshell

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The document provides an overview of OSGi and debunks the myth that it is complex. It explains that OSGi allows for true modularity in Java by defining bundles as JAR files with metadata that can be installed, started, stopped, updated, and uninstalled. The OSGi runtime acts as a lifecycle and dependency manager for bundles, and also manages a services registry where bundles can publish and discover services. It concludes by promising a demo to illustrate these concepts.

Technologie Sports

OSGi in a nutshell
Debunking the myth of OSGi’s complexity

Copyright © Pierre-Antoine Grégoire License Creative
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Event

!   http://www.yajug.lu
!   March 08 2010 Eclipse, OSGi and Spring dmServer
(Project Eclipse Virgo)

Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

Speaker
!   Pierre-Antoine Grégoire

!   I.T.Architect at

!   Occasional committer in open source projects

!   Dislikes buzzwords (SOA, EDA…), likes to
conceptualize and build architectures and to promote
Agile practices

!   Thinks having fun and working seriously (both at the
same time) should be mandatory!

Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

In a nutshell?

OSGi

Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

Modularity == Flexibility
… with limits

Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

!   Classloading issues

!   Dependency hell

!   Dumb Lifecycles

!   …etc

Standard Java Modularity
Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

OSGi
==
Real modularity
in the belly of
Java,
Now!

Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

OSGi Module
==
Bundle
==
Jar with
META-INF/
Manifest.mf
Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

Multiple bundles?
More small pieces?
Easier to manage?

Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

OSGi Runtime
==
Runtime for Bundles
==
Bundle Lifecycle and
Dependency Manager
+ System Services (pre-
deployed bundles)
Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

Bundle
==
Service Oriented
Component
==
Service Consumer
and/or
Service Provider
Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

OSGi Runtime
==
Services Registry and Services
Lifecycle Management

Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

And now, for something
completely different…

Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

The….
Demo!

Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

Creative Commons Attributions
!   http://www.flickr.com/photos/elixir/193006996/

!   http://www.flickr.com/photos/clonedmilkmen/3604999084/

!   http://www.flickr.com/photos/starycat/461380473/

!   http://www.flickr.com/photos/redux/4298421692/

!   http://www.flickr.com/photos/lostcarpark/250616113/

!   http://media.paperblog.fr/i/68/688035/lego-lego-L-2.jpeg

!   http://www.muhlenberg.edu/cultural/graver/Collections/WetlandPlants/
LarchTree.JPG

Copyright © Pierre-Antoine Grégoire License Creative
Commons 2.0

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OSGi In A Nutshell

3. Speaker !   Pierre-Antoine Grégoire !   I.T.Architect at !   Occasional committer in open source projects !   Dislikes buzzwords (SOA, EDA…), likes to conceptualize and build architectures and to promote Agile practices !   Thinks having fun and working seriously (both at the same time) should be mandatory! Copyright © Pierre-Antoine Grégoire License Creative Commons 2.0

15. Creative Commons Attributions !   http://www.flickr.com/photos/elixir/193006996/ !   http://www.flickr.com/photos/clonedmilkmen/3604999084/ !   http://www.flickr.com/photos/starycat/461380473/ !   http://www.flickr.com/photos/redux/4298421692/ !   http://www.flickr.com/photos/lostcarpark/250616113/ !   http://media.paperblog.fr/i/68/688035/lego-lego-L-2.jpeg !   http://www.muhlenberg.edu/cultural/graver/Collections/WetlandPlants/ LarchTree.JPG Copyright © Pierre-Antoine Grégoire License Creative Commons 2.0

OSGi In A Nutshell

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