using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Timers;

namespace Observer.TimerObserver
{
	class Observer
	{
		private Subject subject = new Subject();
		private string status;

		public void Test()
		{
			subject.Changed += Subject_Changed;
		}

		private void Subject_Changed(object sender, EventArgs e)
		{
			ElapsedEventArgs eArgs = e as ElapsedEventArgs;
			DateTime signalTime = eArgs == null ? DateTime.Now : eArgs.SignalTime;
			status = $"Subject updated at {signalTime}";
			Console.WriteLine(status);
		}
	}
}