@Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
    registry.enableStompBrokerRelay("/topic");
    registry.setApplicationDestinationPrefixes("/app");
}

@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
    registry.addEndpoint("/ws")
            .withSockJS();
}

// app is application destination prefix
client.subscribe('/app/notificator', ...);

/topic/notificator/admin - if logged user is of role admin, or
/topic/notificator/user - if logged user is of role user

@Controller
public class QueueController {

    @SubscribeMapping("/notificator")
    public String getNotificatorQueue(Principal principal) {
        String role = // get role from principal
        return "/topic/notificator/" + role;
    }

}