private void TryMakeTransaction(Transaction transactionDto, int attemptNumber)
{
var senderAccount = _accountRepository.SingleOrDefault(c => c.UserId == transactionDto.SenderId);
Account receiverAccount = null;
int transactionDirection = 1;
using (var transaction = _accountRepository.BeginTransaction())
{
try
{
switch (transactionDto.Type)
{
case TransactionType.Withdraw:
transactionDirection = -1;
break;
case TransactionType.Transfer:
receiverAccount =
_accountRepository.SingleOrDefault(c => c.UserId == transactionDto.ReceiverId);
receiverAccount.Balance += transactionDto.Amount;
transactionDirection = -1;
_accountRepository.Update(receiverAccount);
break;
}
senderAccount.Balance += transactionDto.Amount * transactionDirection;
_transactionRepository.Add(new Domain.Transaction()
{
SenderAccountId = senderAccount.AccountId,
Amount = transactionDto.Amount,
ReceiverAccountId = receiverAccount?.AccountId,
Type = transactionDto.Type
});
_accountRepository.Update(senderAccount);
_accountRepository.SaveChanges();
transaction.Commit();
}
catch (Exception e)
{
transaction.Rollback();
_accountRepository.DetachAllEntities();
if (e is DbUpdateConcurrencyException && attemptNumber < _attemptsCount)
{
TryMakeTransaction(transactionDto, ++attemptNumber);
}
else
{
throw new Exception("Sorry, your transaction was canceled! Try again later");
}
}
}
}
public void MakeTransaction(Transaction transactionDto)
{
TryMakeTransaction(transactionDto, 0);
}