code: public void onMessage(WSMessage message) {
          log.trace("Listeners: {}", listeners.size());
          for (IWebSocketDataListener listener : listeners) {
              try {
                  listener.onWSMessage(message);
              } catch (Exception e) {
                  log.warn("onMessage exception", e);
              }
          }
      }
docs: Message received from client and passed on to the listeners.
  
  @param message