public ConcreteObserver(ConcreteObserver parent, string name)
{
this.Parent = parent;
this.Name = name;
this.Id = Guid.NewGuid();
}
public ObserverPattern()
{
ConcreteSubject subject = new ConcreteSubject();
ConcreteObserver observer1 = new ConcreteObserver("Rome", subject);
ConcreteObserver observer2 = new ConcreteObserver("Paris", subject);
ConcreteObserver observer3 = new ConcreteObserver("London", subject);
subject.Attach(observer1);
subject.Attach(observer2);
subject.Attach(observer3);
for (int i = 0; i < 10; i++)
{
subject.ChangeState($"Status #{i}");
subject.Notify();
Thread.Sleep(500);
}
}
static void Main(string[] args)
{
// root
var root = new ConcreteObserver(null, "ROOT");
// 1st level
var subjectFirstLevela = new Subject();
var firstLevela = new ConcreteObserver(root, "A");
var subjectFirstLevelb = new Subject();
var firstLevelb = new ConcreteObserver(root, "B");
var subjectFirstLevelc = new Subject();
var firstLevelc = new ConcreteObserver(root, "C");
// 2nd level
var subjectSecondLevela1 = new Subject();
var secondLevela1 = new ConcreteObserver(firstLevela, "A1");
var subjectSecondLevela2 = new Subject();
var secondLevela2 = new ConcreteObserver(firstLevela, "A2");
var subjectSecondLevelb1 = new Subject();
var secondLevelb1 = new ConcreteObserver(firstLevelb, "B1");
var subjectSecondLevelb2 = new Subject();
var secondLevelb2 = new ConcreteObserver(firstLevelb, "B2");
var subjectSecondLevelc1 = new Subject();
var secondLevelc1 = new ConcreteObserver(firstLevelc, "C1");
var subjectSecondLevelc2 = new Subject();
var secondLevelc2 = new ConcreteObserver(firstLevelc, "C2");
// register upline observer
subjectSecondLevela1.RegisterObserver(firstLevela);
subjectSecondLevela2.RegisterObserver(firstLevela);
subjectSecondLevelb1.RegisterObserver(firstLevelb);
subjectSecondLevelb2.RegisterObserver(firstLevelb);
subjectSecondLevelc1.RegisterObserver(firstLevelc);
subjectSecondLevelc2.RegisterObserver(firstLevelc);
subjectFirstLevela.RegisterObserver(root);
subjectFirstLevelb.RegisterObserver(root);
subjectFirstLevelc.RegisterObserver(root);
// set some points
Console.WriteLine("--------- ADDING SOME FIRSTLEVEL' POINTS ON START ------------");
firstLevela.Points = 1000;
Console.WriteLine("A - 1000 points");
firstLevelb.Points = 2000;
Console.WriteLine("B - 2000 points");
firstLevelc.Points = 3000;
Console.WriteLine("C - 3000 points");
Console.WriteLine("---------------------");
secondLevela1.Points = 100;
secondLevela2.Points = 100;
secondLevelb1.Points = 200;
secondLevelb2.Points = 200;
secondLevelc1.Points = 300;
secondLevelc2.Points = 300;
// notify upline that points have changes
subjectFirstLevela.NotifyObserver(firstLevela.Points);
subjectFirstLevelb.NotifyObserver(firstLevelb.Points);
subjectFirstLevelc.NotifyObserver(firstLevelc.Points);
subjectSecondLevela1.NotifyObserver(secondLevela1.Points);
subjectSecondLevela2.NotifyObserver(secondLevela2.Points);
subjectSecondLevelb1.NotifyObserver(secondLevelb1.Points);
subjectSecondLevelb2.NotifyObserver(secondLevelb2.Points);
subjectSecondLevelc1.NotifyObserver(secondLevelc1.Points);
subjectSecondLevelc2.NotifyObserver(secondLevelc2.Points);
Console.WriteLine("");
Console.WriteLine(" " + root.Name + ": " + root.Points + " points");
Console.WriteLine("");
// 1st level
Console.Write("\t" + firstLevela.Name + ":" + firstLevela.Points);
Console.Write("\t\t\t" + firstLevelb.Name + ":" + firstLevelb.Points);
Console.Write("\t\t\t" + firstLevelc.Name + ":" + firstLevelc.Points);
Console.WriteLine("");
Console.WriteLine("");
// 2nd level
Console.Write(" " + secondLevela1.Name + ":" + secondLevela1.Points);
Console.Write(" " + secondLevela2.Name + ":" + secondLevela2.Points);
Console.Write(" " + secondLevelb1.Name + ":" + secondLevelb1.Points);
Console.Write(" " + secondLevelb2.Name + ":" + secondLevelb2.Points);
Console.Write(" " + secondLevelc1.Name + ":" + secondLevelc1.Points);
Console.Write(" " + secondLevelc2.Name + ":" + secondLevelc2.Points);
Console.ReadKey();
}