public async Task <List <TransactionResponse> > Handle(GetTransactionsByCurrencyQuery request, CancellationToken cancellationToken)
{
var isValid = _transactionValidator.IsCurrencyCodeValid(request.CurrencyCode);
if (!isValid)
{
return(new List <TransactionResponse>());
}
var cacheKey = string.Format(TransactionCacheDefaults.TransactionsByCurrencyCacheFormat, request.CurrencyCode);
return(await _cacheManager.GetOrCreateAsync(cacheKey,
() => _transactionService.GetByCurrencyAsync(request.CurrencyCode)));
}