code: @Override
      public void run() throws Exception {
          QueueContainer queueContainer = getContainer();
          if (queueContainer.hasEnoughCapacity(txSize + 1)) {
              response = queueContainer.txnOfferReserve(transactionId);
          }
      }
docs: {@inheritDoc}
  Sets the response to the next item ID if the queue can
  accomodate {@code txSize + 1} items.
  
  @throws Exception