This annotation can be used to be notified when a component is registered. At this point, the
 component has been registered into the OSGI registry (if it provides some services).
 When a service is registered, the ServiceRegistration used to register the service is
 also passed to the method (if it takes a ServiceRegistration as parameter).
 
 
 
Usage Examples
 
 
 
 @Component
 class X implements Z {
     @Start
     void start() {
         // Our Z Service is about to be registered into the OSGi registry. 
     }
     
     @Registered
     void registered(ServiceRegistration sr) {
        // At this point, our service has been registered into the registry.
     }
 }