private static void AdvancedObserverPattern()
{
//Two kids been created
Kid kid1 = new Kid("Ammie");
Kid kid2 = new Kid("Elizabeth");
//one parent object created.
//this parent has two kids in this case.
Parent parent1 = new Parent();
parent1.Kids.Add(kid1.Name, kid1);
parent1.Kids.Add(kid2.Name, kid2);
//one family doctor object created
//this doctor is kid2's family doctor,
//and I am going to send the note when kid2 isn't well
Doctor doc1 = new Doctor();
doc1.Kids.Add(kid2.Name, kid2);
//I want to send notes to the parents.
kid1.Subscribe(parent1.DailyStatusUpdate);
kid2.Subscribe(parent1.DailyStatusUpdate);
//Update status for both Kids. Parents will receive the notes at the same time
kid1.Status = new Status(String.Format("{0} is happy", kid1.Name));
kid2.Status = new Status(String.Format("{0} is fuzzy", kid2.Name));
//Updates the status after 5 secs
Thread.Sleep(5000);
//after 5 secs, kid2 doesn't feel well. need to get doctor involved
kid2.Subscribe(doc1.DailyStatusUpdate);
//update two kids' status.
//Parent will recive two kids status
//Doc1 start reciving kid2 's status
kid1.Status = new Status(String.Format("{0} is happy", kid1.Name));
kid2.Status = new Status(String.Format("{0} is sick. Tempture : 39.7", kid2.Name));
//Updates the status after 5 secs
Thread.Sleep(5000);
//update two kids' status
kid1.Status = new Status(String.Format("{0} is happy", kid1.Name));
kid2.Status = new Status(String.Format("{0} is back to normal. she is happy now", kid2.Name));
//Updates the status after 5 secs
Thread.Sleep(5000);
//since kid2 is fine. I am going to deattach the doc1's observation
kid2.UnSubscribe(doc1.DailyStatusUpdate);
//update two kids' status
kid1.Status = new Status(String.Format("{0} is happy. Just had a big lunch", kid1.Name));
kid2.Status = new Status(String.Format("{0} is happy. Palying with her best friend Kevin", kid2.Name));
Console.WriteLine("Daily Report End!");
}