static void exchangeNXTForCurrency(
Transaction transaction,
Account account,
final long currencyId,
final long rateNQT,
long units) {
long extraUnits = 0;
long remainingAmountNQT = Math.multiplyExact(units, rateNQT);
List<CurrencySellOffer> currencySellOffers = new ArrayList<>();
try (DbIterator<CurrencySellOffer> offers =
CurrencySellOffer.getOffers(
new ValidOffersDbClause(currencyId, rateNQT, false),
0,
-1,
" ORDER BY rate ASC, creation_height ASC, transaction_height ASC, transaction_index ASC ")) {
for (CurrencySellOffer offer : offers) {
currencySellOffers.add(offer);
}
}
for (CurrencySellOffer offer : currencySellOffers) {
if (remainingAmountNQT == 0) {
break;
}
long curUnits =
Math.min(
Math.min(remainingAmountNQT / offer.getRateNQT(), offer.getSupply()),
offer.getLimit());
if (curUnits == 0) {
continue;
}
long curAmountNQT = Math.multiplyExact(curUnits, offer.getRateNQT());
extraUnits = Math.addExact(extraUnits, curUnits);
remainingAmountNQT = Math.subtractExact(remainingAmountNQT, curAmountNQT);
offer.decreaseLimitAndSupply(curUnits);
long excess = offer.getCounterOffer().increaseSupply(curUnits);
Account counterAccount = Account.getAccount(offer.getAccountId());
counterAccount.addToBalanceNQT(curAmountNQT);
counterAccount.addToUnconfirmedBalanceNQT(
Math.addExact(
Math.multiplyExact(
curUnits - excess, offer.getRateNQT() - offer.getCounterOffer().getRateNQT()),
Math.multiplyExact(excess, offer.getRateNQT())));
counterAccount.addToCurrencyUnits(currencyId, -curUnits);
Exchange.addExchange(
transaction, currencyId, offer, offer.getAccountId(), account.getId(), curUnits);
}
account.addToCurrencyAndUnconfirmedCurrencyUnits(currencyId, extraUnits);
account.addToBalanceNQT(-(Math.multiplyExact(units, rateNQT) - remainingAmountNQT));
account.addToUnconfirmedBalanceNQT(remainingAmountNQT);
}
@Override
void undoAttachmentUnconfirmed(Transaction transaction, Account senderAccount) {
Attachment.MonetarySystemExchangeBuy attachment =
(Attachment.MonetarySystemExchangeBuy) transaction.getAttachment();
senderAccount.addToUnconfirmedBalanceNQT(
Math.multiplyExact(attachment.getUnits(), attachment.getRateNQT()));
}
static void removeOffer(CurrencyBuyOffer buyOffer) {
CurrencySellOffer sellOffer = buyOffer.getCounterOffer();
CurrencyBuyOffer.remove(buyOffer);
CurrencySellOffer.remove(sellOffer);
Account account = Account.getAccount(buyOffer.getAccountId());
account.addToUnconfirmedBalanceNQT(
Math.multiplyExact(buyOffer.getSupply(), buyOffer.getRateNQT()));
account.addToUnconfirmedCurrencyUnits(buyOffer.getCurrencyId(), sellOffer.getSupply());
}
@Override
boolean applyAttachmentUnconfirmed(Transaction transaction, Account senderAccount) {
Attachment.MonetarySystemExchangeBuy attachment =
(Attachment.MonetarySystemExchangeBuy) transaction.getAttachment();
if (senderAccount.getUnconfirmedBalanceNQT()
>= Math.multiplyExact(attachment.getUnits(), attachment.getRateNQT())) {
senderAccount.addToUnconfirmedBalanceNQT(
-Math.multiplyExact(attachment.getUnits(), attachment.getRateNQT()));
return true;
}
return false;
}
@Override
void undoAttachmentUnconfirmed(Transaction transaction, Account senderAccount) {
Attachment.MonetarySystemPublishExchangeOffer attachment =
(Attachment.MonetarySystemPublishExchangeOffer) transaction.getAttachment();
senderAccount.addToUnconfirmedBalanceNQT(
Math.multiplyExact(attachment.getInitialBuySupply(), attachment.getBuyRateNQT()));
Currency currency = Currency.getCurrency(attachment.getCurrencyId());
if (currency != null) {
senderAccount.addToUnconfirmedCurrencyUnits(
attachment.getCurrencyId(), attachment.getInitialSellSupply());
}
}
@Override
boolean applyAttachmentUnconfirmed(Transaction transaction, Account senderAccount) {
Attachment.MonetarySystemReserveIncrease attachment =
(Attachment.MonetarySystemReserveIncrease) transaction.getAttachment();
Currency currency = Currency.getCurrency(attachment.getCurrencyId());
if (senderAccount.getUnconfirmedBalanceNQT()
>= Math.multiplyExact(
currency.getReserveSupply(), attachment.getAmountPerUnitNQT())) {
senderAccount.addToUnconfirmedBalanceNQT(
-Math.multiplyExact(currency.getReserveSupply(), attachment.getAmountPerUnitNQT()));
return true;
}
return false;
}
@Override
boolean applyAttachmentUnconfirmed(Transaction transaction, Account senderAccount) {
Attachment.MonetarySystemPublishExchangeOffer attachment =
(Attachment.MonetarySystemPublishExchangeOffer) transaction.getAttachment();
if (senderAccount.getUnconfirmedBalanceNQT()
>= Math.multiplyExact(
attachment.getInitialBuySupply(), attachment.getBuyRateNQT())
&& senderAccount.getUnconfirmedCurrencyUnits(attachment.getCurrencyId())
>= attachment.getInitialSellSupply()) {
senderAccount.addToUnconfirmedBalanceNQT(
-Math.multiplyExact(attachment.getInitialBuySupply(), attachment.getBuyRateNQT()));
senderAccount.addToUnconfirmedCurrencyUnits(
attachment.getCurrencyId(), -attachment.getInitialSellSupply());
return true;
}
return false;
}
@Override
void undoAttachmentUnconfirmed(Transaction transaction, Account senderAccount) {
Attachment.MonetarySystemReserveIncrease attachment =
(Attachment.MonetarySystemReserveIncrease) transaction.getAttachment();
long reserveSupply;
Currency currency = Currency.getCurrency(attachment.getCurrencyId());
if (currency != null) {
reserveSupply = currency.getReserveSupply();
} else { // currency must have been deleted, get reserve supply from the original issuance
// transaction
Transaction currencyIssuance =
Nxt.getBlockchain().getTransaction(attachment.getCurrencyId());
Attachment.MonetarySystemCurrencyIssuance currencyIssuanceAttachment =
(Attachment.MonetarySystemCurrencyIssuance) currencyIssuance.getAttachment();
reserveSupply = currencyIssuanceAttachment.getReserveSupply();
}
senderAccount.addToUnconfirmedBalanceNQT(
Math.multiplyExact(reserveSupply, attachment.getAmountPerUnitNQT()));
}