public void Run(int i)
{
Console.WriteLine($"\n{i}) Observer\nObserver pattern allows a single object, known as the subject, to publish changes to its state and other observer objects that depend upon the subject are automatically notified of any changes to the subject's state.\n");
//concrete subject
var googleStock = new Stock();
//add concrete observers
googleStock.Add(new GoogleInvestorObserver(googleStock, "Julia"));
googleStock.Add(new GoogleInvestorObserver(googleStock, "Johanna"));
googleStock.Add(new GoogleInvestorObserver(googleStock, "Junior"));
//change price
googleStock.ChangePrice(918);
//notify changes to all investors who are monitoring
//googleStock.Notifiy();
Debug.Assert(googleStock.GetStockPrice() == 918, "Stock price is wrong");
//change price
googleStock.ChangePrice(919);
//notify changes to all investors who are monitoring
//googleStock.Notifiy();
Debug.Assert(googleStock.GetStockPrice() == 919, "Stock price is wrong");
}
public void Update()
{
double stockPrice = _stock.GetStockPrice();
Console.WriteLine($" updated stock price: {stockPrice}, investor {_investorName}");
}