public static SingletonBuildOnDeclarationAndVolatileUsingLock GetInstance()
{
if (_unique == null)
{
lock (_unique){
_unique = new SingletonBuildOnDeclarationAndVolatileUsingLock();
}
}
return(_unique);
}
public void ParallelTest_SingletonBuildOnDeclarationAndVolatileLock()
{
int size = 10000;
var numberExecutions = 0;
Parallel.ForEach(Enumerable.Range(1, size), (i) =>
{
SingletonBuildOnDeclarationAndVolatileUsingLock.GetInstance().RandomName = "Random number: " + i;
var acessing = SingletonBuildOnDeclarationAndVolatileUsingLock.GetInstance().RandomName;
Interlocked.Increment(ref numberExecutions);
});
Assert.Equal(size, numberExecutions);
}
public void SingletonBuildOnDeclarationAndVolatileUsingLock_ValidateConcept()
{
var a = SingletonBuildOnDeclarationAndVolatileUsingLock.GetInstance();
object r = null;
Assert.Throws <NullReferenceException>(() => {
r = a.GetType().GetConstructor(Type.EmptyTypes).Invoke(new object[] {});
});
if (r != null)
{
Assert.Equal(a, r);
}
}
public void CheckIfFromAllUsageIsTheSameObjectReference_SingletonBuildOnDeclarationAndVolatileUsingLock()
{
int size = 300;
var r = new List <SingletonBuildOnDeclarationAndVolatileUsingLock>();
Parallel.ForEach(Enumerable.Range(1, size), (i) =>
{
SingletonBuildOnDeclarationAndVolatileUsingLock.GetInstance().RandomName = "Random number: " + i;
var acessing = SingletonBuildOnDeclarationAndVolatileUsingLock.GetInstance().RandomName;
r.Add(SingletonBuildOnDeclarationAndVolatileUsingLock.GetInstance());
});
var firstItem = r.FirstOrDefault();
Assert.All(r, (item) => item.Equals(firstItem));
}
