// Adds random observer
private static void addObserver(StockSubject s)
{
Random rand = new Random();
int choice = rand.Next(1, 4);
IObserver randObserver;
switch (choice)
{
case 1:
randObserver = new PhoneObserver(s);
break;
case 2:
randObserver = new MatrixBoardObserver(s);
break;
case 3:
randObserver = new NewspaperObserver(s);
break;
default:
randObserver = new NewspaperObserver(s);
break;
}
s.Attach(randObserver);
}
static void Main(string[] args)
{
StockSubject stockSubject = new StockSubject();
stockSubject.Attach(new PhoneObserver(stockSubject));
stockSubject.Attach(new MatrixBoardObserver(stockSubject));
stockSubject.Attach(new NewspaperObserver(stockSubject));
Console.WriteLine("Press ESC to exit, 1 to add a random observer, 2 to remove an observer");
int i = 0;
while (true)
{
if (Console.KeyAvailable)
{
ConsoleKey key = Console.ReadKey(true).Key;
if (key == ConsoleKey.Escape)
{
return;
}
else if (key == ConsoleKey.D1)
{
addObserver(stockSubject);
}
else if (key == ConsoleKey.D2)
{
deleteObserver(stockSubject);
}
}
stockSubject.SetState("Tick: " + i);
stockSubject.Notify();
Thread.Sleep(500);
i++;
}
}
public NewspaperObserver(StockSubject s)
{
subject = s;
}
public PhoneObserver(StockSubject s)
{
subject = s;
}
public MatrixBoardObserver(StockSubject s)
{
subject = s;
}
