code: private void updatePoolConf() throws DevFailed {
          if (!polledDevices.contains(deviceName)) {
              polledDevices.add(deviceName);
              final Map<String, String[]> properties = new HashMap<String, String[]>();
              properties.put(POLLING_THREADS_POOL_CONF, polledDevices.toArray(new String[0]));
              DatabaseFactory.getDatabase().setDeviceProperties(ServerManager.getInstance().getAdminDeviceName(),
                      properties);
          }
      }
docs: Add the current device in polled list and persist it as device property of admin device. This property is not
  used. Just here to have the same behavior as C++ Tango API.
  
  @throws DevFailed