/**
  * Adds SqueezeBoxServerHandlers to the discovery service to find SqueezeBox Players
  *
  * @param squeezeBoxServerHandler
  */
 private synchronized void registerSqueezeBoxPlayerDiscoveryService(
     SqueezeBoxServerHandler squeezeBoxServerHandler) {
   SqueezeBoxPlayerDiscoveryParticipant discoveryService =
       new SqueezeBoxPlayerDiscoveryParticipant(squeezeBoxServerHandler);
   squeezeBoxServerHandler.registerSqueezeBoxPlayerListener(discoveryService);
   this.discoveryServiceRegs.put(
       squeezeBoxServerHandler.getThing().getUID(),
       bundleContext.registerService(
           DiscoveryService.class.getName(), discoveryService, new Hashtable<String, Object>()));
 }