public async Task <int?> CreateNewUser(string userName, double initialBalance)
{
TransactionHandler.StartWork(this.AccountMapper, this.TransactionMapper);
try
{
int genaccountId;
if (initialBalance < 0)
{
throw new BLException(KnownError.InvalidInitialBalance);
}
if (String.IsNullOrEmpty(userName))
{
throw new BLException(KnownError.InvalidUsername);
}
var resAccount = await AccountMapper.AddAccount(userName);
if (resAccount == null || resAccount.AccountId == 0)
{
throw new BLException(KnownError.DALError_ReturnsIncorrectAccountId);
}
genaccountId = resAccount.AccountId;
resAccount = await AccountMapper.UpdateBalance(resAccount, initialBalance);
if (resAccount == null || resAccount.AccountId != genaccountId)
{
throw new BLException(KnownError.DALError_ReturnsIncorrectAccountId);
}
var outTran = await TransactionMapper.AddMTTransaction(resAccount, initialBalance);
if (outTran == null || outTran.TransactionId == 0)
{
throw new BLException(KnownError.DALError_ReturnsIncorrectTransactionId);
}
TransactionHandler.EndWork();
return(resAccount.AccountId);
}
catch (Exception ex)
{
if (ex.InnerException != null)
{
if (ex.InnerException.Message.Contains("IX_Accounts_UserName"))
{
ex = new BLException(KnownError.UsernameExists);
}
}
TransactionHandler.RollbackWork();
throw ex;
}
}
public async Task <int?> Transfer(int source, int destination, double amount)
{
TransactionHandler.StartWork(this.AccountMapper, this.TransactionMapper);
try
{
if (amount < 0)
{
throw new BLException(KnownError.InvalidTransferAmount);
}
var sourceAccount = await AccountMapper.GetAccount(source);
var destinationAccount = await AccountMapper.GetAccount(destination);
if (sourceAccount == null || sourceAccount.AccountId == 0)
{
throw new BLException(KnownError.InvalidSource);
}
if (destinationAccount == null || destinationAccount.AccountId == 0)
{
throw new BLException(KnownError.InvalidDestination);
}
if (sourceAccount.Balance < amount)
{
throw new BLException(KnownError.InvalidTransferAmount);
}
TransactionHandler.Detach(sourceAccount);
TransactionHandler.Detach(destinationAccount);
sourceAccount = await AccountMapper.UpdateBalance(sourceAccount, sourceAccount.Balance - amount);
destinationAccount = await AccountMapper.UpdateBalance(destinationAccount, destinationAccount.Balance + amount);
var outTran = await TransactionMapper.AddMTTransaction(destinationAccount, sourceAccount, amount);
if (outTran == null || outTran.TransactionId == 0)
{
throw new BLException(KnownError.DALError_ReturnsIncorrectTransactionId);
}
TransactionHandler.EndWork();
return(outTran.TransactionId);
}
catch (Exception ex)
{
TransactionHandler.RollbackWork();
throw ex;
}
}