public bool IsMovementPossible(Money money, CreditTransactionType creditTransactionType)
{
Money currentBalance = GetBalance();
Money balanceAfterMovement = new Transaction(money, creditTransactionType).GetBalanceAfterPerformed(currentBalance);
return(balanceAfterMovement.Amount >= 0);
}
public void MakeMovement(Money money, CreditTransactionType creditTransactionType)
{
if (!IsMovementPossible(money, creditTransactionType))
{
throw new NegativeBalanceReachedException("Balance would be negative after this transaction.");
}
_executedTransactions.Add(new ExecutedTransaction(money, creditTransactionType));
}
public Transaction(Money money, CreditTransactionType creditTransactionType)
{
Money = money;
CreditTransactionType = creditTransactionType;
}
public ExecutedTransaction(Money money, CreditTransactionType creditTransactionType) : base(money, creditTransactionType)
{
MovementDate = DateTime.UtcNow;
}
public Task <TransactionAttempt> ExecuteTransaction(Guid transactionIdentifier, Player player, Money money, CreditTransactionType creditTransactionType)
{
bool isMovementPossible = player.Wallet.IsMovementPossible(money, creditTransactionType);
TransactionState transactionResult;
if (isMovementPossible)
{
player.Wallet.MakeMovement(money, creditTransactionType);
transactionResult = TransactionState.Accepted;
}
else
{
transactionResult = TransactionState.Rejected;
}
return(Task.FromResult(new TransactionAttempt(transactionIdentifier, transactionResult)));
}
public async Task <Result <TransactionAttempt> > ExecuteTransaction(Guid transactionIdentifier, Player player, Money money, CreditTransactionType creditTransactionType)
{
bool transactionShouldBeProcessed = _transactionTasksByIdentifier.TryAdd(transactionIdentifier, new TaskCompletionSource <Result <TransactionAttempt> >());
TaskCompletionSource <Result <TransactionAttempt> > transactionInProgress = _transactionTasksByIdentifier[transactionIdentifier];
if (!transactionShouldBeProcessed)
{
return(await transactionInProgress.Task);
}
Result <TransactionAttempt> transaction = null;
try
{
transaction = await _oneTransactionPerPlayerChecker.ExecuteTransaction(transactionIdentifier, player, money, creditTransactionType);
}
catch (Exception ex)
{
_transactionTasksByIdentifier.TryRemove(transactionIdentifier, out _);
transaction = Result.Failure <TransactionAttempt>(ex.Message);
}
finally
{
transactionInProgress.SetResult(transaction);
}
return(transaction);
}
public async Task <TransactionAttempt> ExecuteTransaction(Guid transactionIdentifier, Player player, Money money, CreditTransactionType creditTransactionType)
{
_transactionQueuePerPlayer.TryAdd(player.Identifier, new SemaphoreSlim(MaxNumberOfTransactionsPerPlayer, MaxNumberOfTransactionsPerPlayer));
SemaphoreSlim semaphoreForTransactionProcessingPerPlayer = _transactionQueuePerPlayer[player.Identifier];
await semaphoreForTransactionProcessingPerPlayer.WaitAsync();
try
{
return(await _transactionDomainLogicExecutor.ExecuteTransaction(transactionIdentifier, player, money, creditTransactionType));
}
finally
{
semaphoreForTransactionProcessingPerPlayer.Release();
}
}