public void UsedSemaphoresCannotBeAcquiredWithDifferentId()
{
var pool = new SemaphorePool(3, ExceptionHandlingStrategy.THROW);
var task1 = pool.AcquireAsync("1");
var task2 = pool.AcquireAsync("2");
var task3 = pool.AcquireAsync("3");
var semaphore1 = task1.Result;
var semaphore2 = task2.Result;
var semaphore3 = task3.Result;
Assert.IsNotNull(semaphore1);
Assert.IsNotNull(semaphore2);
Assert.IsNotNull(semaphore3);
var task4 = pool.AcquireAsync("4");
Thread.Sleep(5);
Assert.IsFalse(task4.IsCompleted);
Assert.AreNotEqual(semaphore2, semaphore1, "Semaphore1 and Semaphore2 must not be equal");
Assert.AreNotEqual(semaphore3, semaphore1, "Semaphore1 and Semaphore3 must not be equal");
Assert.AreNotEqual(semaphore3, semaphore2, "Semaphore2 and Semaphore3 must not be equal");
}
public void NoErrorWhenManySimilarRequestsAreMade()
{
var pool = new SemaphorePool(10, ExceptionHandlingStrategy.THROW);
var tasks = new List <Task>();
for (var i = 0; i < 300; i++)
{
tasks.Add(Task.Run(async() =>
{
var stringId = StaticRandom.S(10);
var semaphore = await pool.AcquireAsync(stringId).ConfigureAwait(false);
Assert.IsNotNull(semaphore);
await semaphore.WaitAsync().ConfigureAwait(false);
Assert.IsTrue(pool.AvailableSemaphoreIds.Contains(stringId));
Thread.Sleep(StaticRandom.I100);
semaphore.ReleaseSafe();
pool.Release(stringId);
}));
}
Task.WaitAll(tasks.ToArray());
Assert.IsTrue(tasks.All(a => a.IsCompletedSuccessfully));
Assert.AreEqual(10, pool.SemaphoreHolders.Count);
Assert.AreEqual(0, pool.AvailableSemaphoreIds.Count);
Assert.IsNull(pool.SemaphoreHolders[0].Id);
Assert.IsTrue(pool.SemaphoreHolders.All(a => string.IsNullOrEmpty(a.Id) && a.UsageCount == 0));
}
public void NoErrorWhenManyRequestsAreMade()
{
var pool = new SemaphorePool(10, ExceptionHandlingStrategy.THROW);
var tasks = new List <Task>();
var id = 0;
for (var i = 0; i < 300; i++)
{
tasks.Add(Task.Run(() =>
{
var stringId = id.ToString();
id++;
var semaphore = pool.AcquireAsync(stringId).Result;
Assert.IsNotNull(semaphore);
Thread.Sleep(10);
pool.Release(stringId);
}));
}
Task.WaitAll(tasks.ToArray());
Assert.IsTrue(tasks.All(a => a.IsCompletedSuccessfully));
Assert.AreEqual(10, pool.SemaphoreHolders.Count);
Assert.AreEqual(0, pool.AvailableSemaphoreIds.Count);
Assert.IsNull(pool.SemaphoreHolders[0].Id);
Assert.IsTrue(pool.SemaphoreHolders.All(a => string.IsNullOrEmpty(a.Id) && a.UsageCount == 0));
}
public void SemaphoreCanBeAcquiredWithSameId()
{
var pool = new SemaphorePool(1, ExceptionHandlingStrategy.THROW);
var task1 = pool.AcquireAsync("1");
var task2 = pool.AcquireAsync("1");
Thread.Sleep(10);
var semaphore1 = task1.Result;
var semaphore2 = task2.Result;
Assert.AreEqual(semaphore1, semaphore2, "semaphore1 and semaphore2 should be equal");
Assert.AreEqual(1, pool.SemaphoreHolders.Count);
Assert.AreEqual(1, pool.AvailableSemaphoreIds.Count);
Assert.AreEqual("1", pool.AvailableSemaphoreIds.First());
Assert.AreEqual("1", pool.SemaphoreHolders[0].Id);
Assert.AreEqual(2, pool.SemaphoreHolders[0].UsageCount);
}
public void SemaphoreCanBeAcquiredOnlyAfterAllAcquisitionsAreReleased()
{
var pool = new SemaphorePool(1, ExceptionHandlingStrategy.THROW);
var task11 = pool.AcquireAsync("1");
var task12 = pool.AcquireAsync("1");
var task13 = pool.AcquireAsync("1");
var semaphore1 = task11.Result;
Assert.IsNotNull(semaphore1);
Assert.AreEqual(semaphore1, task12.Result, "both semaphores should be equal");
Assert.AreEqual(semaphore1, task13.Result, "Both semaphores should be equal");
Assert.AreEqual(1, pool.SemaphoreHolders.Count);
Assert.AreEqual(1, pool.AvailableSemaphoreIds.Count);
Assert.AreEqual("1", pool.AvailableSemaphoreIds.First());
Assert.AreEqual("1", pool.SemaphoreHolders[0].Id);
Assert.AreEqual(3, pool.SemaphoreHolders[0].UsageCount);
var task2 = pool.AcquireAsync("2");
Thread.Sleep(5);
Assert.IsFalse(task2.IsCompleted);
pool.Release("1");
Thread.Sleep(5);
Assert.IsFalse(task2.IsCompleted);
pool.Release("1");
Thread.Sleep(5);
Assert.IsFalse(task2.IsCompleted);
pool.Release("1");
var semaphore2 = task2.Result;
Assert.AreEqual(semaphore2, semaphore1, "Semaphore1 and Semaphore2 should be equal");
Assert.AreEqual(1, pool.SemaphoreHolders.Count);
Assert.AreEqual(1, pool.AvailableSemaphoreIds.Count);
Assert.AreEqual("2", pool.SemaphoreHolders[0].Id);
Assert.AreEqual(1, pool.SemaphoreHolders[0].UsageCount);
}
public void UsedSemaphoreCanBeAcquiredWithSameId()
{
var pool = new SemaphorePool(1, ExceptionHandlingStrategy.THROW);
var task1 = pool.AcquireAsync("1");
var task3 = pool.AcquireAsync("1");
var semaphore1 = task1.Result;
var semaphore3 = task3.Result;
var task2 = pool.AcquireAsync("2");
Thread.Sleep(5);
Assert.IsFalse(task2.IsCompleted);
Assert.IsNotNull(semaphore1);
Assert.AreEqual(semaphore3, semaphore1, "Semaphore1 and Semaphore3 must be equal");
Assert.AreEqual(1, pool.SemaphoreHolders.Count);
Assert.AreEqual(2, pool.AvailableSemaphoreIds.Count);
Assert.AreEqual("1", pool.AvailableSemaphoreIds.First());
Assert.AreEqual("1", pool.SemaphoreHolders[0].Id);
Assert.AreEqual(2, pool.SemaphoreHolders[0].UsageCount);
}
public void ComplexUsageTest()
{
var pool = new SemaphorePool(2, ExceptionHandlingStrategy.THROW);
var task11 = pool.AcquireAsync("1");
var task21 = pool.AcquireAsync("2");
Thread.Sleep(5);
var task12 = pool.AcquireAsync("1");
var task22 = pool.AcquireAsync("2");
var task3 = pool.AcquireAsync("3");
Thread.Sleep(5);
var semaphore11 = task11.Result;
var semaphore12 = task12.Result;
var semaphore21 = task21.Result;
var semaphore22 = task22.Result;
Assert.IsNotNull(semaphore11);
Assert.AreEqual(semaphore12, semaphore11, "semaphore11 and semaphore12 should be equal");
Assert.IsNotNull(semaphore21);
Assert.AreEqual(semaphore21, semaphore22, "semaphore21 and semaphore22 should be equal");
Assert.IsFalse(task3.IsCompleted);
pool.Release("1");
Thread.Sleep(5);
Assert.IsFalse(task3.IsCompleted);
pool.Release("1");
Thread.Sleep(5);
Assert.IsTrue(task3.IsCompleted);
var task4 = pool.AcquireAsync("4");
Thread.Sleep(5);
Assert.IsFalse(task4.IsCompleted);
pool.Release("2");
Thread.Sleep(5);
Assert.IsFalse(task4.IsCompleted);
pool.Release("2");
Thread.Sleep(5);
Assert.IsTrue(task4.IsCompleted);
pool.Release("3");
pool.Release("4");
Thread.Sleep(5);
var task1 = pool.AcquireAsync("1");
var task2 = pool.AcquireAsync("2");
Thread.Sleep(5);
Assert.IsTrue(task1.IsCompleted);
Assert.IsTrue(task2.IsCompleted);
pool.Release("1");
pool.Release("2");
Assert.AreEqual(2, pool.SemaphoreHolders.Count);
Assert.AreEqual(0, pool.AvailableSemaphoreIds.Count);
Assert.IsTrue(pool.SemaphoreHolders.All(a => string.IsNullOrEmpty(a.Id) && a.UsageCount == 0));
}