docs: private void startListenerThreadIfNewService(URL url) {
          String serviceName = url.getPath();
          if (!lookupServices.containsKey(serviceName)) {
              Long value = lookupServices.putIfAbsent(serviceName, 0L);
              if (value == null) {
                  ServiceLookupThread lookupThread = new ServiceLookupThread(serviceName);
                  lookupThread.setDaemon(true);
                  lookupThread.start();
              }
          }
      }