static void Main(string[] args)
{
Console.WriteLine(" ***Observer Pattern Demo***\n");
//We have 3 observers- 2 of them are ObserverType1, 1 of them is of ObserverType2
IObserver myObserver1 = new ObserverType1("Roy");
IObserver myObserver2 = new ObserverType1("Kevin");
IObserver myObserver3 = new ObserverType2("Bose");
Subject subject = new Subject();
//Registering the observers-Roy,Kevin,Bose
subject.Register(myObserver1);
subject.Register(myObserver2);
subject.Register(myObserver3);
Console.WriteLine(" Setting Flag = 5 ");
subject.Flag = 5;
//Unregistering an observer(Roy))
subject.Unregister(myObserver1);
//No notification this time Roy.Since it is unregistered.
Console.WriteLine("\n Setting Flag = 50 ");
subject.Flag = 50;
//Roy is registering himself again
subject.Register(myObserver1);
Console.WriteLine("\n Setting Flag = 100 ");
subject.Flag = 100;
Console.ReadKey();
}
static void Main(string[] args)
{
Console.WriteLine("Observer Pattern");
//we have 4 observers - 2 of them are ObserverType1 and 2 are ObserverType2
var myObserver1 = new ObserverType1("Roy");
var myObserver2 = new ObserverType1("Kevin");
var myObserver3 = new ObserverType2("Bose");
var myObserver4 = new ObserverType2("Jacklin");
Console.WriteLine("Working with first celebrity now!");
ICelebrity celebrity = new Celebrity("Celebrity-1");
//registering the observers - Roy, Kevin, Bose
celebrity.Register(myObserver1);
celebrity.Register(myObserver2);
celebrity.Register(myObserver3);
Console.WriteLine("Celebrity-1 is setting Flag = 5");
celebrity.Flag = 5;
//Kevin doesn't want to get further notification
//unregistering the observer(Kevin)
Console.WriteLine("Celebrity-1 is removing Kevin from the observer list now");
celebrity.Unregister(myObserver2);
Console.WriteLine("Celebrity-1 is setting Flag = 50");
celebrity.Flag = 50;
//Kevin is registering himself again
celebrity.Register(myObserver2);
Console.WriteLine("Celebrity-1 is setting Flag = 100");
celebrity.Flag = 100;
Console.WriteLine("Working with another celebrity now!");
ICelebrity celebrity2 = new Celebrity("Celebrity-2");
//registering the observers Roy and Jacklin
celebrity2.Register(myObserver1);
celebrity2.Register(myObserver4);
Console.WriteLine("Celebrity-2 is setting Flag = 500");
celebrity2.Flag = 500;
Console.Read();
}
static void Main(string[] args)
{
Console.WriteLine("***Observer Pattern Demonstration.***\n");
//We have 4 observers-2 of them are ObserverType1, 1 is of ObserverType2
IObserver myObserver1 = new ObserverType1("Roy");
IObserver myObserver2 = new ObserverType1("Kevin");
IObserver myObserver3 = new ObserverType2("Bose");
IObserver myObserver4 = new ObserverType2("Jacklin");
Console.WriteLine("Working with first celebrity now.");
ICelebrity celebrity = new Celebrity("Celebrity-1");
//Registering the observers-Roy,Kevin,Bose
celebrity.Register(myObserver1);
celebrity.Register(myObserver2);
celebrity.Register(myObserver3);
Console.WriteLine(" Celebrity-1 is setting Flag = 5.");
celebrity.Flag = 5;
/*
* Kevin doesn't want to get further notification.
* So, unregistering the observer(Kevin)).
*/
Console.WriteLine("\nCelebrity-1 is removing Kevin from the observer list now.");
celebrity.Unregister(myObserver2);
//No notification is sent to Kevin this time. He has unregistered.
Console.WriteLine("\n Celebrity-1 is setting Flag = 50.");
celebrity.Flag = 50;
//Kevin is registering himself again
celebrity.Register(myObserver2);
Console.WriteLine("\n Celebrity-1 is setting Flag = 100.");
celebrity.Flag = 100;
Console.WriteLine("\n Working with another celebrity now.");
//Creating another celebrity
ICelebrity celebrity2 = new Celebrity("Celebrity-2");
//Registering the observers-Roy and Jacklin
celebrity2.Register(myObserver1);
celebrity2.Register(myObserver4);
Console.WriteLine("\n --Celebrity-2 is setting Flag value as 500.--");
celebrity2.Flag = 500;
Console.ReadKey();
}
static void Main(string[] args)
{
Console.WriteLine("Observer Pattern");
IObserver obs1 = new ObserverType1("Jessie");
IObserver obs2 = new ObserverType2("Luke");
IObserver obs3 = new ObserverType1("Bo");
Subject sbj = new Subject();
sbj.Register(obs1);
sbj.Register(obs2);
sbj.Register(obs3);
sbj.Flag = 50;
sbj.UnRegister(obs1);
sbj.Flag = 100;
}