Remoting Singleton

//  (c) 2002 Daniel Aioanei (aioaneid@go.ro)
//  
//  Use at your own risk.

using System;
using System.Diagnostics;
using System.Runtime.Remoting;

public interface ISingleton
{
	int S
	{
		get;
		set;
	}
}

public class SingletonFactory : MarshalByRefObject
{
	static ISingleton instance;

	public ISingleton Instance
	{
		get
		{
			if (instance == null)
			{
				lock (typeof(SingletonFactory))
				{
					if (instance == null)
					{
//						instance = new Singleton();

						// no compile-time dependency
						ObjectHandle objectHandle = Activator.CreateInstance(
							"SingletonImpl", "Singleton");
						instance = (ISingleton)objectHandle.Unwrap();

						// shouldn't be transparent proxy
						if (RemotingServices.IsTransparentProxy(instance))
						{
							throw new Exception(
								"instance should not be a TransparentProxy");
						}
					}
				}
			}

			return instance;
		}
	}
}