public void TestPerformance_Of_DoubleLock_And_SingleLock()
{
DoubleCheckLockingSingleton doubleCheckSingleton = null;
var stopWatch = System.Diagnostics.Stopwatch.StartNew();
stopWatch.Start();
for (int i = 0; i < invokeCounter; i++)
{
doubleCheckSingleton = DoubleCheckLockingSingleton.GetSingletonInstance();
}
stopWatch.Stop();
var elapsedDoubleCheck = stopWatch.ElapsedMilliseconds;
SingleCheckSingleton singleCheckSingleton = null;
stopWatch.Start();
for (int i = 0; i < invokeCounter; i++)
{
singleCheckSingleton = SingleCheckSingleton.GetSingletonInstance();
}
stopWatch.Stop();
var elapsedSingleCheck = stopWatch.ElapsedMilliseconds;
Assert.IsTrue(elapsedDoubleCheck < elapsedSingleCheck);
}
public void CheckIf_DoubleCheckSingletonInstances_AreEqual()
{
DoubleCheckLockingSingleton singleton = DoubleCheckLockingSingleton.GetSingletonInstance();
DoubleCheckLockingSingleton secondSingleton = DoubleCheckLockingSingleton.GetSingletonInstance();
Assert.AreEqual(singleton, secondSingleton);
}
public void CheckIf_DoubleCheckSingleton_Contains_OneInstance_Parallel()
{
Parallel.For(0, numberOfThreads, task =>
{
DoubleCheckLockingSingleton.GetSingletonInstance();
});
Assert.AreEqual(1, DoubleCheckLockingSingleton.SingletonInstances);
}
public void CheckIf_DoubleCheckSingleton_Contains_OneInstance()
{
for (int i = 0; i < invokeCounter; i++)
{
DoubleCheckLockingSingleton.GetSingletonInstance();
}
Assert.AreEqual(1, DoubleCheckLockingSingleton.SingletonInstances);
}
public static DoubleCheckLockingSingleton GetSingletonInstance()
{
if (singletonInstance == null)
{
lock (locker)
{
if (singletonInstance == null)
{
singletonInstance = new DoubleCheckLockingSingleton();
SingletonInstances += 1;
}
}
}
return(singletonInstance);
}
public void TestThredsPerformance_Of_DoubleLock_And_SingleLock()
{
var stopWatch = System.Diagnostics.Stopwatch.StartNew();
stopWatch.Start();
Parallel.For(0, numberOfThreads, task =>
{
DoubleCheckLockingSingleton.GetSingletonInstance();
});
stopWatch.Stop();
var elapsedDoubleCheck = stopWatch.ElapsedTicks;
stopWatch.Start();
Parallel.For(0, numberOfThreads, task =>
{
SingleCheckSingleton.GetSingletonInstance();
});
stopWatch.Stop();
var elapsedSingleCheck = stopWatch.ElapsedTicks;
Assert.IsTrue(elapsedDoubleCheck < elapsedSingleCheck, string.Format("Elapsed single: {0}, double: {1}",
elapsedSingleCheck, elapsedDoubleCheck));
}