@SuppressWarnings("unchecked")
private Sysprop fetchFxRatesJSON() {
Map<String, Object> map = new HashMap<String, Object>();
Sysprop s = new Sysprop();
ObjectReader reader = ParaObjectUtils.getJsonReader(Map.class);
try {
CloseableHttpClient http = HttpClients.createDefault();
HttpGet httpGet = new HttpGet(SERVICE_URL);
HttpResponse res = http.execute(httpGet);
HttpEntity entity = res.getEntity();
if (entity != null && Utils.isJsonType(entity.getContentType().getValue())) {
JsonNode jsonNode = reader.readTree(entity.getContent());
if (jsonNode != null) {
JsonNode rates = jsonNode.get("rates");
if (rates != null) {
map = reader.treeToValue(rates, Map.class);
s.setId(FXRATES_KEY);
s.setProperties(map);
// s.addProperty("fetched", Utils.formatDate("dd MM yyyy HH:mm", Locale.UK));
dao.create(s);
}
}
EntityUtils.consume(entity);
}
logger.debug("Fetched rates from OpenExchange for {}.", new Date().toString());
} catch (Exception e) {
logger.error("TimerTask failed: {}", e);
}
return s;
}
@Override
public Double convertCurrency(Number amount, String from, String to) {
if (amount == null || StringUtils.isBlank(from) || StringUtils.isBlank(to)) {
return 0.0;
}
Sysprop s = dao.read(FXRATES_KEY);
if (s == null) {
s = fetchFxRatesJSON();
} else if ((Utils.timestamp() - s.getTimestamp()) > REFRESH_AFTER) {
// lazy refresh fx rates
Para.asyncExecute(
new Runnable() {
public void run() {
fetchFxRatesJSON();
}
});
}
double ratio = 1.0;
if (s.hasProperty(from) && s.hasProperty(to)) {
Double f = NumberUtils.toDouble(s.getProperty(from).toString(), 1.0);
Double t = NumberUtils.toDouble(s.getProperty(to).toString(), 1.0);
ratio = t / f;
}
return amount.doubleValue() * ratio;
}