private void Handle(RollbackTransaction cmd)
{
var sender = Sender;
if (cmd.AccountNumber != _state.AccountNumber)
{
throw new NotFoundException("Invalid Account Number");
}
if (_state.OutstandingTransaction.ContainsKey(cmd.TransactionId))
{
// command idempotent, just confirm that it is done
// btw, this particular case is the one that should be validate if transaction even exists but before
// command reaches aggregate. For such purpose we need to use command handlers as facade to domain
Respond(sender, "Rolled Back");
return;
}
var amount = _state.OutstandingTransaction[cmd.TransactionId];
var commit = new AccountDebitRolledBack
{
TransactionId = cmd.TransactionId,
AccountNumber = _state.AccountNumber,
Reason = cmd.Reason,
Amount = amount
};
Persist(commit, e =>
{
ApplyEvent(e);
Respond(sender, "Commited", new[] { commit });
});
}
internal static void OnRollbackTransaction(object sender, EventArgs e)
{
RollbackTransaction?.Invoke(sender, e);
}