//多執行緒時保證SingletonLock一定是單一的
public static SingletonLock GetSingletonLock()
{
if (instance == null)
{
lock (SingletonLock.instance)
{
if (instance == null)
{
instance = new SingletonLock();
}
}
}
return(instance);
}
public static SingletonLock getInstance()
{
if (_instance == null)
{
lock (syncRoot)
{
if (_instance == null)
{
_instance = new SingletonLock();
}
}
}
return(_instance);
}
public static SingletonLock GetInstance()
{
if (_instance == null)
{
lock (_lock)
{
if (_instance == null)
{
_instance = new SingletonLock();
}
}
}
return(_instance);
}
//https://metanit.com/sharp/patterns/2.3.php
//https://refactoring.guru/ru/design-patterns/singleton/csharp/example#example-1
//https://professorweb.ru/my/it/blog/net/singleton_csharp.php
//https://shwanoff.ru/singleton/amp/
static void Main(string[] args)
{
(new Thread(() =>
{
Console.WriteLine(SingletonLock.getInstance().Date);
})).Start();
(new Thread(() =>
{
Console.WriteLine(SingletonLock.getInstance().Date);
})).Start();
Console.WriteLine(SingletonLock.getInstance().Date);
(new Thread(() =>
{
Console.WriteLine(SingletonRO.getInstance().Date);
})).Start();
(new Thread(() =>
{
Console.WriteLine(SingletonRO.getInstance().Date);
})).Start();
Console.WriteLine(SingletonRO.getInstance().Date);
Console.WriteLine(SingletonNested.text);
(new Thread(() =>
{
Console.WriteLine(SingletonNested.getInstance().Date);
})).Start();
(new Thread(() =>
{
Console.WriteLine(SingletonNested.getInstance().Date);
})).Start();
Console.WriteLine(SingletonNested.getInstance().Date);
(new Thread(() =>
{
Console.WriteLine(SingletonROLazy.getInstance().Date);
})).Start();
(new Thread(() =>
{
Console.WriteLine(SingletonROLazy.getInstance().Date);
})).Start();
Console.WriteLine(SingletonROLazy.getInstance().Date);
Console.ReadLine();
}
/// <summary>
/// Tratar de crear dos instancias de la clase y verificar que se devuelve la misma instancia.
/// </summary>
private static void CrearDosInstanciasDeLaClaseSingletonLock()
{
//Primera Instancia del singleton
SingletonLock singleton = SingletonLock.Instance;
// Hacemos una pausa de tres segundos
Thread.Sleep(3000);
// Intentamos instanciar un segundo Singleton
SingletonLock segundoSingleton = SingletonLock.Instance;
Console.WriteLine("Singleton Lock \n");
// Comprobamos que ambos objetos son referencias a la misma
// instancia, que es única
Console.WriteLine(string.Format("Instancia {0} creada a las {1}",
singleton.Nombre, singleton.HoraArranque.ToLongTimeString()));
Console.WriteLine(string.Format("Instancia {0} creada a las {1}",
segundoSingleton.Nombre, segundoSingleton.HoraArranque.ToLongTimeString()));
Console.WriteLine("---------------");
Console.WriteLine("El singleton Lock se creó a las " + SingletonLock.Instance.HoraArranque.ToLongTimeString());
}