public static void Run()
{
Console.WriteLine("This real-world code demonstrates the Observer pattern in which registered investors are notified every time a stock changes value.\n");
IBM ibm = new IBM("IBM", 120.00);
ibm.Attach(new Investor("Sorros"));
ibm.Attach(new Investor("Berkshire"));
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
ibm.Price = 120.75;
/*
* Notified Sorros of IBM's change to $120.10
* Notified Berkshire of IBM's change to $120.10
*
* Notified Sorros of IBM's change to $121.00
* Notified Berkshire of IBM's change to $121.00
*
* Notified Sorros of IBM's change to $120.50
* Notified Berkshire of IBM's change to $120.50
*
* Notified Sorros of IBM's change to $120.75
* Notified Berkshire of IBM's change to $120.75
*/
}
public static void Main()
{
// Create IBM stock and attach investors
IBM ibm = new IBM("IBM", 120.00);
ibm.Attach(new Investor("Sorros"));
ibm.Attach(new Investor("Berkshire"));
// Fluctuating prices will notify investors
ibm.Price = 120.10;
ibm.Price = 121.00;
}
public static void Run()
{
Console.WriteLine("Observer Real World Practice");
IBM ibm = new IBM("IBM", 120.00);
ibm.Attach(new Investor("Sorros"));
ibm.Attach(new Investor("Berkshire"));
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
ibm.Price = 120.75;
}
static void Main(string[] args)
{
IBM ibm = new IBM("IBM", 120.00);
ibm.Attach(new Investor("Sorros"));
ibm.Attach(new Investor("Berkshire"));
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
ibm.Price = 120.75;
}
internal static void Main()
{
// Create IBM stock and attach investors
var ibm = new IBM("IBM", 120.00);
ibm.Attach(new Investor("Sorros"));
ibm.Attach(new Investor("Berkshire"));
// Fluctuating prices will notify investors
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
ibm.Price = 120.75;
}
/// <summary>
/// Entry point into console application.
/// </summary>
static void Main()
{
// Create IBM stock and attach investors
IBM ibm = new IBM("IBM", 120.00);
ibm.Attach(new Investor("Sorros"));
ibm.Attach(new Investor("Berkshire"));
// Fluctuating prices will notify investors
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
ibm.Price = 120.75;
// Wait for user
Console.ReadKey();
}
public static void Main(string[] args)
{
IBM ibm = new IBM("IBM", 120.00);
ibm.Attach(new Investor("Sorros"));
ibm.Attach(new Investor("Berkshire"));
// Fluctuating prices will notify investors
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
ibm.Price = 120.75;
Console.ReadKey();
}
static void Main(string[] args)
{
// Create IBM stock and attach investors
IBM ibm = new IBM("IBM", 120.00);
ibm.Attach(new Investor("Sorros"));
ibm.Attach(new Investor("Berkshire"));
// Fluctuating prices will notify investors
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = Convert.ToDouble(Console.ReadLine());
// Wait for user
Console.ReadKey();
}
/// <summary>
/// Entry point into console application.
/// </summary>
static void Main()
{
// Create IBM stock and attach investors
IBM ibm = new IBM("IBM", 120.00);
ibm.Attach(new Investor("Sorros"));
ibm.Attach(new Investor("Berkshire"));
// Fluctuating prices will notify investors
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
ibm.Price = 120.75;
// Wait for user
Console.ReadKey();
}
static void Main()
{
// First example
ConcreteSubject s = new ConcreteSubject();
s.Attach(new ConcreteObserver(s, "x"));
s.Attach(new ConcreteObserver(s, "y"));
s.Attach(new ConcreteObserver(s, "z"));
s.SubjectState = "abc";
s.Notify();
IBM ibm = new IBM("IBM", 120.00);
ibm.Attach(new Investor("Sorros"));
ibm.Attach(new Investor("Berkshire"));
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
ibm.Price = 120.75;
ibm.Notify();
// Second example
BaggageHandler provider = new BaggageHandler();
ArrivalsMonitor observer1 = new ArrivalsMonitor("BaggageClaimMonitor1");
ArrivalsMonitor observer2 = new ArrivalsMonitor("SecurityExit");
provider.BaggageStatus(712, "Detroit", 3);
observer1.Subscribe(provider);
provider.BaggageStatus(712, "Kalamazoo", 3);
provider.BaggageStatus(400, "New York-Kennedy", 1);
provider.BaggageStatus(712, "Detroit", 3);
observer2.Subscribe(provider);
provider.BaggageStatus(511, "San Francisco", 2);
provider.BaggageStatus(712);
observer2.Unsubscribe();
provider.BaggageStatus(400);
provider.LastBaggageClaimed();
// Third example
var weatherData = new WeatherData();
var forecastDisplay = new ForecastDisplay(weatherData);
var heatIndexDisplay = new HeatIndexDisplay(weatherData);
weatherData.setMeasurements(80, 65, 30.4f);
}
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
IBM ibm = new IBM("IBM", 120.00);
ibm.Attach(new Investor("Sorros"));
ibm.Attach(new Investor("Berkshire"));
// Fluctuating prices will notify investors
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
ibm.Price = 120.75;
// Wait for user
Console.ReadKey();
}
static void Main(string[] args)
{
IBM ibm = new IBM("IBM", 120.00);
ibm.Attach(new Investor("Tam"));
ibm.Attach(new Investor("Minh"));
ibm.Attach(new Investor("Tri"));
ibm.Detach(new Investor("Minh"));
// Fluctuating prices will notify investors
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
ibm.Price = 120.75;
// Wait for user
Console.ReadKey();
}
internal static void Main()
{
// Create IBM stock and attach investors
var ibm = new IBM("IBM", 120.00);
var sorros = new Investor("Sorros");
ibm.Attach(sorros);
ibm.Attach(new Investor("Berkshire"));
// Fluctuating prices will notify investors
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Detach(sorros);
ibm.Price = 120.50;
ibm.Attach(sorros);
ibm.Price = 120.75;
}
/// <summary>
/// Entry point into console application.
/// </summary>
static void Main()
{
// Create IBM stock and attach investors
var ibm = new IBM(120.00);
// Attach 'listeners', i.e. Investors
ibm.Attach(new Investor { Name = "Sorros" });
ibm.Attach(new Investor { Name = "Berkshire" });
// Fluctuating prices will notify listening investors
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
ibm.Price = 120.75;
// Wait for user
Console.ReadKey();
}