code: public void registerTransaction(TransactionImpl tran) {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "registerTransaction", new Object[] { this, tran });
  
          _recoveringTransactions.add(tran);
  
          if (tc.isEntryEnabled())
              Tr.exit(tc, "registerTransaction", _recoveringTransactions.size());
      }
docs: Registers a recovered transactions existance. This method is triggered from
  the FailureScopeController.registerTransaction for all transactions that
  have been created during a recovery process.
  
  @param tran The transaction reference object.