code: @Override
  	public void rollback() {
  		for (ResourceManager<Transaction> manager : managers.values()) {
  			Transaction transaction = manager.transaction();
  			
  			if (transaction.isActive()) {
  				try {
  					transaction.rollback();
  				} catch (Exception e) {
  					logger.warning("Transaction [" + transaction.getId()
  							+ "]: Rollback failed due to [" + e
  							+ "]; Consistency will be ensured in read");
  				}
  			}
  		}
  	}
docs: Rolls back every operation in the current transaction.