public function getRates($currencyPair)
{
if (is_string($currencyPair)) {
$currencyPair = CurrencyPair::createFromString($currencyPair);
} elseif (!$currencyPair instanceof CurrencyPair) {
throw new \InvalidArgumentException('The currency pair must be either a string or an instance of CurrencyPair');
}
/**
* @TODO: Imti is Cache duomenis
*/
if (null !== $this->cache && null !== ($rate = $this->cache->fetchRate($currencyPair))) {
return $rate;
}
if (isset($this->chainProviders)) {
$rate = $this->chainProviders->fetchRates($currencyPair);
} else {
$rate = $this->provider->fetchRates($currencyPair);
}
if (null !== $this->cache) {
$this->cache->storeRate($currencyPair, $rate);
}
return $rate;
}