public void BuyStock(SalesPerson person, string item, int quantity)
{
_stock.AddOrUpdate(item, quantity, (key, oldValue) => oldValue + quantity);
Interlocked.Add(ref _totalQuantityBought, quantity);
_toDoQueue.AddTrade(new Trade(person, -quantity));
}
public Trade(SalesPerson person, int quantitySold)
{
this.Person = person;
this.QuantitySold = quantitySold;
}
