public void InitializeOnlyOnce()
{
var control = 0;
var threadDone = 0;
var needle = new LazyNeedle <int>(() =>
{
Interlocked.Increment(ref control);
return(5);
});
using (var manual = new ManualResetEvent(false))
{
var threadA = new Thread
(
() =>
{
manual.WaitOne();
needle.Initialize();
Interlocked.Increment(ref threadDone);
}
);
var threadB = new Thread(() =>
{
manual.WaitOne();
needle.Initialize();
Interlocked.Increment(ref threadDone);
});
var threadC = new Thread(() =>
{
manual.WaitOne();
needle.Initialize();
Interlocked.Increment(ref threadDone);
});
threadA.Start();
threadB.Start();
threadC.Start();
manual.Set();
threadA.Join();
threadB.Join();
threadC.Join();
needle.Initialize();
needle.Initialize();
Assert.IsTrue(needle.IsCompleted);
Assert.AreEqual(needle.Value, 5);
Assert.AreEqual(control, 1);
Assert.AreEqual(threadDone, 3);
manual.Close();
}
}
public void FixedHashCode()
{
//No initial value
var a = new LazyNeedle <int>();
var hashcode = a.GetHashCode();
a.Value = 5;
Assert.AreEqual(hashcode, a.GetHashCode());
a.Value = 6;
Assert.AreEqual(hashcode, a.GetHashCode());
//Initial value
var b = new LazyNeedle <int>(5);
hashcode = b.GetHashCode();
b.Value = 5;
Assert.AreEqual(hashcode, b.GetHashCode());
b.Value = 6;
Assert.AreEqual(hashcode, b.GetHashCode());
//ValueFactory
var c = new LazyNeedle <int>(() => 5);
hashcode = c.GetHashCode();
c.Initialize();
Assert.IsTrue(c.IsCompleted);
Assert.AreEqual(c.Value, 5);
Assert.AreEqual(hashcode, c.GetHashCode());
}
public void Waiting()
{
var waitStarted = 0;
var threadDone = 0;
var control = 0;
var readed = 0;
var needle = new LazyNeedle <int>(() =>
{
Interlocked.Increment(ref control);
return(5);
});
var threadA = new Thread(() =>
{
Thread.VolatileWrite(ref waitStarted, 1);
needle.Wait();
needle.Initialize();
Interlocked.Increment(ref threadDone);
});
var threadB = new Thread
(
() =>
{
while (Thread.VolatileRead(ref waitStarted) == 0)
{
Thread.Sleep(0);
}
readed = needle.Value;
}
);
threadA.Start();
threadB.Start();
threadA.Join();
threadB.Join();
needle.Initialize();
Assert.IsTrue(needle.IsCompleted);
Assert.AreEqual(readed, 5);
Assert.AreEqual(needle.Value, 5);
Assert.AreEqual(control, 1);
Assert.AreEqual(threadDone, 1);
Assert.AreEqual(waitStarted, 1);
}
public void WaitingAlreadyCompleted()
{
var needle = new LazyNeedle <int>(5);
Assert.IsTrue(needle.IsCompleted);
Assert.AreEqual(needle.Value, 5);
needle.Wait();
Assert.IsTrue(needle.IsCompleted);
Assert.AreEqual(needle.Value, 5);
needle.Initialize();
Assert.IsTrue(needle.IsCompleted);
Assert.AreEqual(needle.Value, 5);
}
public void FixedHashCode()
{
//No initial value
var a = new LazyNeedle<int>();
var hashcode = a.GetHashCode();
a.Value = 5;
Assert.AreEqual(hashcode, a.GetHashCode());
a.Value = 6;
Assert.AreEqual(hashcode, a.GetHashCode());
//Initial value
var b = new LazyNeedle<int>(5);
hashcode = b.GetHashCode();
b.Value = 5;
Assert.AreEqual(hashcode, b.GetHashCode());
b.Value = 6;
Assert.AreEqual(hashcode, b.GetHashCode());
//ValueFactory
var c = new LazyNeedle<int>(() => 5);
hashcode = c.GetHashCode();
c.Initialize();
Assert.IsTrue(c.IsCompleted);
Assert.AreEqual(c.Value, 5);
Assert.AreEqual(hashcode, c.GetHashCode());
}
public void WaitingAlreadyCompleted()
{
var needle = new LazyNeedle<int>(5);
Assert.IsTrue(needle.IsCompleted);
Assert.AreEqual(needle.Value, 5);
needle.Wait();
Assert.IsTrue(needle.IsCompleted);
Assert.AreEqual(needle.Value, 5);
needle.Initialize();
Assert.IsTrue(needle.IsCompleted);
Assert.AreEqual(needle.Value, 5);
}
public void Waiting()
{
var waitStarted = 0;
var threadDone = 0;
var control = 0;
var readed = 0;
var needle = new LazyNeedle<int>(() =>
{
Interlocked.Increment(ref control); return 5;
});
var threadA = new Thread(() =>
{
Thread.VolatileWrite(ref waitStarted, 1);
needle.Wait();
needle.Initialize();
Interlocked.Increment(ref threadDone);
});
var threadB = new Thread
(
() =>
{
while (Thread.VolatileRead(ref waitStarted) == 0)
{
Thread.Sleep(0);
}
readed = needle.Value;
}
);
threadA.Start();
threadB.Start();
threadA.Join();
threadB.Join();
needle.Initialize();
Assert.IsTrue(needle.IsCompleted);
Assert.AreEqual(readed, 5);
Assert.AreEqual(needle.Value, 5);
Assert.AreEqual(control, 1);
Assert.AreEqual(threadDone, 1);
Assert.AreEqual(waitStarted, 1);
}
public void InitializeOnlyOnce()
{
var control = 0;
var threadDone = 0;
var needle = new LazyNeedle<int>(() =>
{
Interlocked.Increment(ref control); return 5;
});
var manual = new ManualResetEvent(false);
var threadA = new Thread(() =>
{
manual.WaitOne();
needle.Initialize();
Interlocked.Increment(ref threadDone);
});
var threadB = new Thread(() =>
{
manual.WaitOne();
needle.Initialize();
Interlocked.Increment(ref threadDone);
});
var threadC = new Thread(() =>
{
manual.WaitOne();
needle.Initialize();
Interlocked.Increment(ref threadDone);
});
threadA.Start();
threadB.Start();
threadC.Start();
manual.Set();
threadA.Join();
threadB.Join();
threadC.Join();
needle.Initialize();
needle.Initialize();
Assert.IsTrue(needle.IsCompleted);
Assert.AreEqual(needle.Value, 5);
Assert.AreEqual(control, 1);
Assert.AreEqual(threadDone, 3);
manual.Close();
}