April 2008
Intermediate to advanced
468 pages
10h 16m
German
book
Die OSGi Service Platform: Eine Einführung mit Eclipse Equinox
by Gerd Wütherich, Nils Hartmann, Bernd Kolb, Matthias Lübken
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Chapter 12. Declarative Services
Motivation
Das OSGi Framework implementiert ein Service-Modell, in dem Services programmatisch an der Service Registry angemeldet und abgefragt werden. Dieses Modell ist sehr mächtig, besitzt jedoch bei der Konstruktion großer Anwendungssysteme einige Nachteile:
Startup-Dauer: Das Service-Modell erfordert, dass Services instanziert und aktiv registriert werden, was in der Regel beim Start des implementierenden Bundles erfolgt. In Systemen mit vielen Bundles kann dies schnell zu einer inakzeptablen Startup-Dauer führen.
Speicherverbrauch: Für jeden Service, der im Framework registriert wird, werden alle zugehörigen Klassen und Objekte in den Speicher geladen. Falls der Service niemals genutzt wird, ist dieser Speicherplatz ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.