code: protected void updateProgress() {
  
          CmsRpcAction<CmsUploadProgessInfo> callback = new CmsRpcAction<CmsUploadProgessInfo>() {
  
              /**
               * @see org.opencms.gwt.client.rpc.CmsRpcAction#execute()
               */
              @Override
              public void execute() {
  
                  getUploadService().getUploadProgressInfo(this);
              }
  
              /**
               * @see org.opencms.gwt.client.rpc.CmsRpcAction#onFailure(java.lang.Throwable)
               */
              @Override
              public void onFailure(Throwable t) {
  
                  super.onFailure(t);
                  cancelUpdateProgress();
              }
  
              /**
               * @see org.opencms.gwt.client.rpc.CmsRpcAction#onResponse(java.lang.Object)
               */
              @Override
              protected void onResponse(CmsUploadProgessInfo result) {
  
                  updateProgressBar(result);
              }
          };
          callback.execute();
      }
docs: Retrieves the progress information from the server.<p>