public void LimitedSizeQueueCanClearItems()
{
var q = new LimitedSizeQueue <int>(3);
Assert.IsTrue(q.TryEnqueue(1));
Assert.IsTrue(q.TryEnqueue(2));
Assert.IsTrue(q.TryEnqueue(3));
Assert.IsFalse(q.TryEnqueue(4));
Assert.AreEqual(3, q.Count);
Assert.AreEqual(3, q.Limit);
q.Clear();
Assert.AreEqual(0, q.Count);
Assert.AreEqual(3, q.Limit);
var items = string.Join(", ", q.Select(i => i.ToString()).ToArray());
Assert.AreEqual(string.Empty, items);
}
public void ZeroLimitMeansUnlimitedSize()
{
var q = new LimitedSizeQueue <int>(0);
foreach (var item in Enumerable.Range(1, 1000))
{
Assert.IsTrue(q.TryEnqueue(item));
}
q.Clear();
Assert.AreEqual(0, q.Count);
Assert.AreEqual(0, q.Limit);
}
// Methods to queue work.
/// <summary>
/// Queues a method for the execution, and specifies an object to be used by the method.
/// </summary>
/// <param name="work">A <see cref="WaitCallback" /> representing the method to execute.</param>
/// <param name="obj">An object containing data to be used by the method.</param>
public void QueueUserWorkItem(WaitCallback work, object obj)
{
WorkItem wi = new WorkItem(work, obj);
// If execution context flowing is on, capture the caller's context.
if (m_flowExecutionContext)
{
wi.m_executionContext = ExecutionContext.Capture();
}
// Make sure the pool is started (threads created, etc).
EnsureStarted();
// Now insert the work item into the queue, possibly waking a thread.
lock (m_queue)
{
m_queue.TryEnqueue(wi);
if (m_threadsWaiting > 0)
{
Monitor.Pulse(m_queue);
}
}
}
public void LimitedSizeQueueLimitsTheSizeOfTheInternalQueue()
{
var q = new LimitedSizeQueue <int>(3);
Assert.AreEqual(0, q.Count);
Assert.AreEqual(3, q.Limit);
Assert.IsFalse(q.TryPeek(out _));
Assert.IsFalse(q.TryDequeue(out _));
Assert.IsTrue(q.TryEnqueue(1));
Assert.IsTrue(q.TryEnqueue(2));
Assert.IsTrue(q.TryEnqueue(3));
Assert.IsFalse(q.TryEnqueue(4));
Assert.IsFalse(q.TryEnqueue(5));
var items = string.Join(", ", q.Select(i => i.ToString()).ToArray());
Assert.AreEqual("1, 2, 3", items);
Assert.IsTrue(q.TryDequeue(out var item));
Assert.AreEqual(1, item);
Assert.IsTrue(q.TryEnqueue(6));
Assert.IsFalse(q.TryEnqueue(7));
Assert.IsTrue(q.TryDequeue(out item));
Assert.AreEqual(2, item);
Assert.IsTrue(q.TryDequeue(out item));
Assert.AreEqual(3, item);
Assert.IsTrue(q.TryPeek(out item));
Assert.AreEqual(6, item);
Assert.IsTrue(q.TryDequeue(out item));
Assert.AreEqual(6, item);
Assert.IsFalse(q.TryPeek(out _));
Assert.IsFalse(q.TryDequeue(out _));
}
