Creating your own service
From RifidiWiki
Define your service
- create a new OSGi Bundle.
 - First create an interface for your service.
 - Implement the interface.
 - Register the service in the activator:
 
public void start(BundleContext context) throws Exception {
	super.start(context);
	plugin = this;
	context.registerService(CablingService.class.getName(),
				new CablingServiceImpl(), null);
}
And that's it. Your service is available as soon as the first class from your bundle is loaded.