code: TransactionOperationFactory assertStartedAndReturnFactory() {
        TransactionOperationFactory tmp = operationFactory;
        if (tmp == null) {
           throw getLog().transactionTableNotStarted();
        }
        return tmp;
     }
docs: Check this component has started (i.e. {@link TransactionOperationFactory} isn't null)
  
  @return the {@link TransactionOperationFactory} to use.