public void DoWork_OneEnqueuedItem_CallbackShouldBeExecutedOnce()
{
var countdownEvent = new CountdownEvent(1);
var tooManyExecutions = false;
Action <string> callback = (item) =>
{
if (!countdownEvent.IsSet)
{
countdownEvent.Signal();
}
else
{
tooManyExecutions = true;
}
};
var queueWorkerThread = new QueueWorkerThread <string>(callback);
queueWorkerThread.Enqueue("Test 1");
var executedOnce = countdownEvent.Wait(100);
Assert.IsTrue(executedOnce);
Assert.IsFalse(tooManyExecutions);
}
public void DoWork_IdleSleepTimeIs50ms_ShouldSleep50msWhenIdle()
{
var resetEvent = new AutoResetEvent(false);
Action <string> callback = (item) =>
{
resetEvent.Set();
};
var queueWorkerThread = new QueueWorkerThread <string>(callback, 50);
// This test is not exact - we try getting close by measuring the time it takes between
// execution of two items with a forced idle time in between.
var stopwatch = new Stopwatch();
stopwatch.Start();
// Let the first item be executed.
queueWorkerThread.Enqueue("Test 1");
resetEvent.WaitOne(100);
// Wait for a moment, after which we should be idling for 50ms.
Thread.Sleep(10);
// Add another item and see how long it takes for execution.
queueWorkerThread.Enqueue("Test 2");
resetEvent.WaitOne(100);
stopwatch.Stop();
Assert.IsTrue(stopwatch.ElapsedMilliseconds >= 50); // Should almost always be == 50, but the measurement is not 100% exact.
}
public void DoWork_MultipleEnqueuedItems_CallbackShouldRunOncePerItem()
{
var countdownEvent = new CountdownEvent(5);
var tooManyExecutions = false;
Action <string> callback = (item) =>
{
if (!countdownEvent.IsSet)
{
countdownEvent.Signal();
}
else
{
tooManyExecutions = true;
}
};
var queueWorkerThread = new QueueWorkerThread <string>(callback);
queueWorkerThread.Enqueue("Test 1");
queueWorkerThread.Enqueue("Test 2");
queueWorkerThread.Enqueue("Test 3");
queueWorkerThread.Enqueue("Test 4");
queueWorkerThread.Enqueue("Test 5");
var allItemsExecuted = countdownEvent.Wait(100);
Assert.IsTrue(allItemsExecuted);
Assert.IsFalse(tooManyExecutions);
}
public void Constructor_ValidCallback_IdleSleepTimeIsPositive_ShouldCreateInstance()
{
Action <string> callback = (item) => { };
var queueWorkerThread = new QueueWorkerThread <string>(callback, 1);
Assert.IsNotNull(queueWorkerThread);
}
public void DoWork_IdleSleepTimeIsDefault_ShouldNotSleepWhenIdle()
{
var resetEvent = new AutoResetEvent(false);
Action <string> callback = (item) =>
{
resetEvent.Set();
};
var queueWorkerThread = new QueueWorkerThread <string>(callback);
queueWorkerThread.Enqueue("Test 1");
resetEvent.WaitOne(100);
queueWorkerThread.Enqueue("Test 2");
var executedItem2 = resetEvent.WaitOne(5); // Executing item 2 may at most take 5 ms.
Assert.IsTrue(executedItem2);
}
public void DoWork_OneEnqueuedItem_CallbackShouldReceiveTheEnqueuedItem()
{
var resetEvent = new AutoResetEvent(false);
string receivedItem = null !;
Action <string> callback = (item) =>
{
receivedItem = item;
resetEvent.Set();
};
var queueWorkerThread = new QueueWorkerThread <string>(callback);
queueWorkerThread.Enqueue("Test 1");
resetEvent.WaitOne(100);
Assert.AreEqual("Test 1", receivedItem);
}
public void Dispose_ShouldShutdownThread()
{
var resetEvent = new AutoResetEvent(false);
Action <string> callback = (item) =>
{
resetEvent.Set();
};
var queueuWorkerThread = new QueueWorkerThread <string>(callback);
queueuWorkerThread.Dispose();
Thread.Sleep(3); // Give the thread some time to shut down.
// Reset the resetEvent and enqueue an item, which should trigger
// the callback if the thread is still running (which it should not be).
resetEvent.Reset();
queueuWorkerThread.Enqueue("Test 1");
var signaled = resetEvent.WaitOne(3);
Assert.IsFalse(signaled);
}
public void DoWork_CallbackShouldRunOnDifferentThread()
{
var resetEvent = new AutoResetEvent(false);
var currentThreadId = Thread.CurrentThread.ManagedThreadId;
var callbackThreadId = 0;
Action <string> callback = (item) =>
{
callbackThreadId = Thread.CurrentThread.ManagedThreadId;
resetEvent.Set();
};
var queueWorkerThread = new QueueWorkerThread <string>(callback);
queueWorkerThread.Enqueue("Test 1");
resetEvent.WaitOne(100);
Assert.AreNotEqual(0, callbackThreadId);
Assert.AreNotEqual(currentThreadId, callbackThreadId);
}
