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EclipseDemoCamp An event of annual series of Eclipse Demo Camps is taking place in Hamburg again. The event was planned in November, but takes actually place in December. As usually Peter and Martinare responsible for the organization. To make it short:

If you want to attend, make sure you find a minute to write you name down in EclipseWiki. I suppose these kind of events is well-known. If you never heard of that – look at the interesting topics and the attendee list of more than one hundred people. You will have the opportunity to listen to the talks, to speak with interesting people and get some news from Eclipse Commiters and Users. In the end you usually get some food and bevereges, to make the atmosphere a little more relaxed. If you never been there it is worth to visit…

As announced in a previous post the Eclipse Demo Camp Hamburg – Galileo Edition took place in the East Hotel in Hamburg. Organized by Peter and Martin, the event was again an interesting meeting with Eclipse-interested people in a wonderful location. Five presenters introduced Eclipse and OSGi-related topics. Moritz Eysholdt reported about the (Meta)Model Evolutions, he was focusing on during his masters thesis. The interesting part of his solution are two Xtext DSLs for description of the Metamodel changes (EPatch) and model migration algorithms (MetaPatch). Heiko Behrens gave a funny and really good introduction of Xtext and DSLs for not Xtext developers. I really like his examples: these are simple and understanding for everyone. Great job! Marco Mosconi showed some ObjectTeams (black) magic. A very intersting technology using aspect-oriented programming for type-safe framework modifications. Seem to be pretty advanced technology with interesting tooling. Markus Alexander Kuppe had a talk on ECF and RFC 119 and gave some sneak preview of the upcomming features. Finally, I had a short talk on Common Navigator Framework, basically explaining the article posted here and something I documented for Galileo. Here are some visual impressions: my FlickR set and  Peter’s.

OSGi HHOSGi HHOSGi HH

Yesterday, the OSGi session took place in Hotel East in Hamburg. Peter Kriens, the OSGi evangelist showed a wonderful Zen Presentation on OSGi. I wrote a lot during his talk which happens to me very seldom. Here are the core statements I understood:

  • The core difference between usual plugin architectures and OSGi is that OSGi concentrates on collaboration of the components.
  • OSGi delivers a controlled environment, in which the question if a component runs or not can be answered in beforehand.
  • OSGi bundles use metadata (about versions, dependencies, etc) to predict an error, not discover it in runtime.
  • OSGi has a very narrow API containing the minimal common part.
  • OSGi consists of module, life cycle and services layers. The initially developed services layer required smart class loading mechanisms (module layer).
  1. The module layer is desigend to control the class loading machanisms (e.G. structureal class loader hierarchies instead of a linear classpath)
  2. Life cycle layer adds a management API (e.G. inform the others about installation event)
  3. Separation of concerns is promoted by definition of services for different tasks.
  • Services are used for decoupling of system parts (This is a standard application of service-orientation).
  • OSGI makes dependencies explicit (private, import, export)
  • OSGI tries to make the system managable, taking dynamics and lifecycle as fisrst-class citizens
  • OSGI will be extended to support distribution: the team works on policies, SLAs, etc…

I liked the talk and the way how Peter Kriens addressed the problems of OO. I was confirmed in some ideas about coupling that will be layed out in my thesis. After the presentation we had a delicious meal and wraped up the evening with interesting discussion about pros and contras of OSGi. Peter Friese showed me some remote OSGi staff, he was playing with. The lack of documentation in this area makes it a little difficult, but I hope he will post some news on it. As usual, you can find other pictures in my FlickR gallery.