static void Main(string[] args)
{
//Simple Singleton
SimpleSingleton simpleSingleton = SimpleSingleton.GetInstance();
simpleSingleton.ShowMessage("simple singleton");
SimpleSingleton simpleSingleton2 = SimpleSingleton.GetInstance();
if (simpleSingleton == simpleSingleton2)
{
Console.WriteLine("This is the same instance");
}
//Thread Safe Singleton, call from the master thread
ThreadSafeSingleton threadSafeSingleton = ThreadSafeSingleton.GetInstance();
threadSafeSingleton.ShowMessage("thread safe singleton");
ThreadSafeSingleton threadSafeSingleton2 = ThreadSafeSingleton.GetInstance();
if (threadSafeSingleton == threadSafeSingleton2)
{
Console.WriteLine("This is the same instance");
}
//Get object from different threads.
Parallel.For(0, 10000, (i) =>
{
ThreadSafeSingleton threadSingleton = ThreadSafeSingleton.GetInstance();
ThreadSafeSingleton threadSingleton2 = ThreadSafeSingleton.GetInstance();
if (threadSingleton != threadSingleton2)
{
throw new Exception("The threads broke the program");
}
});
}
//a helper method designed to set the singleton to null which triggers a rebuilding of the instance on next use
public void Clear()
{
Console.WriteLine("Clearing singleton...");
//by setting this to null, the next thread that uses this singleton will cause it to reinitialize
_instance = null;
}
public static ThreadSafeSingleton getInstance()
{
if (instance == null)
{
instance = new ThreadSafeSingleton();
}
return(instance);
}
static void Main(string[] args)
{
Singleton s1 = Singleton.SingleInstance;
Singleton s2 = Singleton.SingleInstance;
Singleton s3 = Singleton.SingleInstance;
ThreadSafeSingleton tss1 = ThreadSafeSingleton.SingleInstance;
ThreadSafeSingleton tss2 = ThreadSafeSingleton.SingleInstance;
ThreadSafeSingleton tss3 = ThreadSafeSingleton.SingleInstance;
Console.ReadKey();
}
public static ThreadSafeSingleton GetInstance()
{
lock (padLock)
{
if (_instace == null)
{
_instace = new ThreadSafeSingleton();
}
return(_instace);
}
}
static void Main(string[] args)
{
// Lazy Initialization Singleton Design Pattern
LazyInitializationSingleton lazyInitializationSingleton = LazyInitializationSingleton.GetInstance();
lazyInitializationSingleton.TestInstance();
// Eager Initialization Singleton Design Pattern
EagerInitializationSingleton eagerInitializationSingleton = EagerInitializationSingleton.GetInstance();
eagerInitializationSingleton.TestInstance();
// Thread Safe Singleton Design Pattern
ThreadSafeSingleton threadSafeSingleton = ThreadSafeSingleton.GetInstance();
threadSafeSingleton.TestInstance();
}
