Singleton design issue: (Creating two objects of singleton class)

Question

I have a question in my mind that there is an issue with Singleton Pattern. Suppose i make an object of Singleton class and serialize it.

Now I restart the server.

Suppose I have again created the instance of Singleton class and then de-serialize it. It creates two objects.

This breaks the Singleton pattern. How do you solve it so that 2nd object is not created.

Than there is something wrong with your code. Show some code please. — Alex van den Hoogen, May 01 '14 at 10:27

score 0 · Answer 1 · answered May 01 '14 at 18:42

A correct implementation of a singleton will not create more than one instance. How to do this will be somewhat language-dependent. See , e.g., http://csharpindepth.com/Articles/General/Singleton.aspx

public sealed class Singleton
{
    private static Singleton instance = null;
    private static readonly object padlock = new object();

    Singleton()
    {
    }

    public static Singleton Instance
    {
        get
        {
            lock (padlock)
            {
                if (instance == null)
                {
                    instance = new Singleton();
                }
                return instance;
            }
        }
    }
}

Singleton design issue: (Creating two objects of singleton class)

1 Answers1