docs: @Override
      public PortletEventQueue getPortletEventQueue(HttpServletRequest request) {
          request = this.portalRequestUtils.getOriginalPortalRequest(request);
  
          synchronized (PortalWebUtils.getRequestAttributeMutex(request)) {
              PortletEventQueue portletEventQueue =
                      (PortletEventQueue) request.getAttribute(PORTLET_EVENT_QUEUE);
              if (portletEventQueue == null) {
                  portletEventQueue = new PortletEventQueue();
                  request.setAttribute(PORTLET_EVENT_QUEUE, portletEventQueue);
              }
              return portletEventQueue;
          }
      }