code: public synchronized boolean markIsTransaction(String uuid, boolean isTransaction) {
  		if (this.isTransaction == null) {
  			return false;
  		}
  
  		this.isTransaction.put(uuid, isTransaction);
  		return true;
  	}
docs: Marks a UUID as either a transaction or a query
  @param uuid ID to be marked
  @param isTransaction true for transaction, false for query
  @return whether or not the UUID was successfully marked