using System;

namespace proxy_pattern_sample
{
	abstract class Subject 
	{
		abstract public void Request();		
	}
	//----------------------------------
	// "RealSubject" 
	class RealSubject : Subject
	{
		override public void Request()
		{
			Console.WriteLine(
			"Bang! The Request method at the RealSubject..");
		}
	}
	//----------------------------------
	// "Proxy" 
	class Proxy : Subject
	{
		RealSubject rS;
		override public void Request()
		{
			if( rS == null )
				rS = new RealSubject();
			rS.Request();
		}	
	}
	//----------------------------------
	//The simple client implementation
	class Proxy_Pattern_SampleClient
	{
		[STAThread]
		static void Main(string[] args)
		{
			Proxy p = new Proxy();
			p.Request();
			Console.Read();
		}
	}
}