private BigDecimal getExchangeRateLastSync(String cryptoCurrency, String fiatCurrency) {
if (!ICurrencies.NXT.equalsIgnoreCase(cryptoCurrency)) {
return null; // unsupported currency
}
OrderBookResponse orderBookResponse = api.returnOrderBook("returnOrderBook", "BTC_NXT", 10000);
if (orderBookResponse != null) {
BigDecimal[][] asks = orderBookResponse.getAsks();
BigDecimal asksTotal = BigDecimal.ZERO;
BigDecimal targetAmount =
new BigDecimal(100000); // calculate price based on this amount of NXT
BigDecimal tradableLimit = BigDecimal.ZERO;
for (int i = 0; i < asks.length; i++) {
BigDecimal[] ask = asks[i];
// log.debug("ask = " + ask);
asksTotal = asksTotal.add(ask[1]);
if (targetAmount.compareTo(asksTotal) <= 0) {
tradableLimit = ask[0];
break;
}
}
// System.out.println("tradableLimit = " + tradableLimit);;
if (tradableLimit != null) {
BigDecimal btcRate = btcRs.getExchangeRateLast(ICurrencies.BTC, fiatCurrency);
if (btcRate != null) {
return btcRate.multiply(tradableLimit);
}
}
return null;
}
return null;
}
@Override
public BigDecimal getExchangeRateLast(String cryptoCurrency, String fiatCurrency) {
if (!ICurrencies.NXT.equalsIgnoreCase(cryptoCurrency)) {
return null;
}
String key = cryptoCurrency + "_" + fiatCurrency;
synchronized (rateAmounts) {
long now = System.currentTimeMillis();
BigDecimal amount = rateAmounts.get(key);
if (amount == null) {
BigDecimal result = getExchangeRateLastSync(cryptoCurrency, fiatCurrency);
log.debug("Called bitcoinaverage exchange for rate: " + key + " = " + result);
rateAmounts.put(key, result);
rateTimes.put(key, now + MAXIMUM_ALLOWED_TIME_OFFSET);
return result;
} else {
Long expirationTime = rateTimes.get(key);
if (expirationTime > now) {
return rateAmounts.get(key);
} else {
// do the job;
BigDecimal result = getExchangeRateLastSync(cryptoCurrency, fiatCurrency);
log.debug("Called bitcoinaverage exchange for rate: " + key + " = " + result);
rateAmounts.put(key, result);
rateTimes.put(key, now + MAXIMUM_ALLOWED_TIME_OFFSET);
return result;
}
}
}
}