static void MatchOffers(
IStocksForSaleRepository forSaleRepo,
IBuyOfferRepository buyOffersRepo,
IStocksRepository ownerRepo,
IMessageBus bus)
{
var forSaleTask = forSaleRepo.Read();
var buyOffersTask = buyOffersRepo.Read();
Task.WhenAll(forSaleTask, buyOffersTask).GetAwaiter().GetResult();
var stocksForSale = forSaleTask.Result.ToList();
var buyOffers = buyOffersTask.Result.ToList();
foreach (var offer in buyOffers)
{
try
{
var matchingForSale = stocksForSale.FirstOrDefault(s =>
string.Equals(s.Stock, offer.Stock, StringComparison.CurrentCultureIgnoreCase) &&
s.Price == offer.Price &&
s.Amount == offer.Amount);
if (matchingForSale == null)
{
continue;
}
// made a sale, yay
stocksForSale.Remove(matchingForSale);
Task.WhenAll(
buyOffersRepo.Delete(offer.BuyerId, offer.Stock, offer.Amount, offer.Price),
forSaleRepo.Delete(matchingForSale.SellerId, matchingForSale.Stock, matchingForSale.Amount,
matchingForSale.Price),
ownerRepo.Delete(matchingForSale.SellerId, offer.Stock, offer.Amount),
ownerRepo.Write(offer.BuyerId, offer.Stock, offer.Amount),
bus.Publish(new StockTradeHappenedEventDto()
{
BuyerId = offer.BuyerId,
SellerId = matchingForSale.SellerId,
Amount = offer.Amount,
Price = offer.Price,
Stock = offer.Stock
})).GetAwaiter().GetResult();
}
catch (Exception e)
{
Console.WriteLine($"Problem occured while matching offers: {e.Message}");
throw;
}
}
}
private void DeleteWithRetries(Stock stock)
{
int retries = 3;
while (retries > 0)
{
try {
stocksRepository.Delete(stock);
return;
} catch (DBConnectionException e) {
retries--;
continue;
}
}
}