private StockCommand ProcessPurchaseEvent(string buyerName, int numberSold)
{
if (BuyerName == buyerName)
{
Snapshot = Snapshot.Bought(numberSold);
if (Snapshot.BoughtSoFar >= NumberToBuy)
{
Snapshot = Snapshot.Closed();
}
}
return(StockCommand.None());
}
private StockCommand ProcessPriceEvent(int currentPrice, int numberInStock)
{
if (currentPrice > MaximumPrice)
{
Snapshot = Snapshot.Monitoring(currentPrice, numberInStock);
return(StockCommand.None());
}
Snapshot = Snapshot.Buying(currentPrice, numberInStock);
int numberToBuy = Math.Min(numberInStock, NumberToBuy);
return(StockCommand.Buy(currentPrice, numberToBuy));
}
public StockCommand Process(StockEvent stockEvent)
{
if (Snapshot.State == BuyerState.Closed)
{
return(StockCommand.None());
}
switch (stockEvent.Type)
{
case StockEventType.Price:
return(ProcessPriceEvent(stockEvent.CurrentPrice, stockEvent.NumberInStock));
case StockEventType.Purchase:
return(ProcessPurchaseEvent(stockEvent.BuyerName, stockEvent.NumberSold));
case StockEventType.Close:
return(ProcessCloseEvent());
default:
throw new InvalidOperationException();
}
}
private StockCommand ProcessCloseEvent()
{
Snapshot = Snapshot.Closed();
return(StockCommand.None());
}
