docs: @Override
      protected void enqueueNotification(final Notification not) {
          final Runnable r = new Runnable() {
              @Override
              public void run() {
                  not.lastRun = System.currentTimeMillis();
  
                  final SubscriptionSummary summary = postNotification(not.subscriber, not.mimeType, not.payload);
  
                  if (!summary.isLastPublishSuccessful()) {
                      not.retryCount++;
  
                      if (not.retryCount <= 5) {
                          retry(not);
                      }
                  }
  
                  not.callback.onSummaryInfo(summary);
              }
          };
  
          exeuctor.execute(r);
      }