public async Task CantTakeLockOnFirstNodeOfGraphAsync()
{
// Arrange
var vertex1 = new AsyncLockDAGVertex();
var vertex2 = new AsyncLockDAGVertex();
var vertex3 = new AsyncLockDAGVertex();
var vertex4 = new AsyncLockDAGVertex();
vertex1.AddEdgesTo(vertex2, vertex3);
vertex2.AddEdgesTo(vertex4);
vertex3.AddEdgesTo(vertex4);
var lastLock = await vertex4.GetLockAsync(CancellationToken.None).ConfigureAwait(false);
// Act
var firstLockTask = vertex1.GetLockAsync(CancellationToken.None);
// Assert
firstLockTask.IsCompleted.Should().BeFalse();
lastLock.Dispose();
await Task.Delay(500).ConfigureAwait(false); // Attempts to ensure that task is complete.
firstLockTask.IsCompleted.Should().BeTrue();
}
public async Task ChildWaitAllParentsLocks()
{
// Arrange
var vertex1 = new AsyncLockDAGVertex();
var vertex2 = new AsyncLockDAGVertex();
var vertex3 = new AsyncLockDAGVertex();
var vertex4 = new AsyncLockDAGVertex();
vertex1.AddEdgesTo(vertex2, vertex3);
vertex2.AddEdgesTo(vertex4);
vertex3.AddEdgesTo(vertex4);
var lock2 = await vertex2.GetLockAsync(CancellationToken.None).ConfigureAwait(false);
var lock3 = await vertex3.GetLockAsync(CancellationToken.None).ConfigureAwait(false);
// Act
var lock4Task = vertex4.GetLockAsync(CancellationToken.None);
// Assert
lock4Task.IsCompleted.Should().BeFalse();
lock2.Dispose();
await Task.Delay(500); // Attempts to ensure that task is complete.
lock4Task.IsCompleted.Should().BeFalse();
lock3.Dispose();
await Task.Delay(500); // Attempts to ensure that task is complete.
lock4Task.IsCompleted.Should().BeTrue();
}
public async Task CantTakeSecondLockOnSingleNodeAsync()
{
// Arrange
var vertex = new AsyncLockDAGVertex();
var firstLock = await vertex.GetLockAsync(CancellationToken.None).ConfigureAwait(false);
// Act
var secondLockTask = vertex.GetLockAsync(CancellationToken.None);
// Assert
secondLockTask.IsCompleted.Should().BeFalse();
firstLock.Dispose();
await Task.Delay(500).ConfigureAwait(false); // Attempts to ensure that task is complete.
secondLockTask.IsCompleted.Should().BeTrue();
}
public async Task LocksIfCanceledIfTokenIsCancelled()
{
var cts = new CancellationTokenSource();
// Arrange
var vertex = new AsyncLockDAGVertex();
_ = await vertex.GetLockAsync(cts.Token).ConfigureAwait(false);
// Act
var secondLockTask = vertex.GetLockAsync(cts.Token);
// Assert
secondLockTask.IsCompleted.Should().BeFalse();
cts.Cancel();
await Task.Delay(500).ConfigureAwait(false); // Attempts to ensure that task is complete.
secondLockTask.IsCanceled.Should().BeTrue();
}
public async Task CanTakeLockOnSingleNodeAsync()
{
// Arrange
var vertex = new AsyncLockDAGVertex();
// Act
var exception = await Record.ExceptionAsync(
async() => await vertex.GetLockAsync(CancellationToken.None).ConfigureAwait(false)).ConfigureAwait(false);
// Assert
exception.Should().BeNull();
}
public async Task CanTakeLockOnLastNodeOfGraphAsync()
{
// Arrange
var vertex1 = new AsyncLockDAGVertex();
var vertex2 = new AsyncLockDAGVertex();
var vertex3 = new AsyncLockDAGVertex();
var vertex4 = new AsyncLockDAGVertex();
vertex1.AddEdgesTo(vertex2, vertex3);
vertex2.AddEdgesTo(vertex4);
vertex3.AddEdgesTo(vertex4);
// Act
var exception = await Record.ExceptionAsync(
async() => await vertex4.GetLockAsync(CancellationToken.None).ConfigureAwait(false)).ConfigureAwait(false);
// Assert
exception.Should().BeNull();
}
public async Task ChildsLocksDoesnotBlocksEachOther()
{
// Arrange
var vertex1 = new AsyncLockDAGVertex();
var vertex2 = new AsyncLockDAGVertex();
var vertex3 = new AsyncLockDAGVertex();
var vertex4 = new AsyncLockDAGVertex();
vertex1.AddEdgesTo(vertex2, vertex3);
vertex2.AddEdgesTo(vertex4);
vertex3.AddEdgesTo(vertex4);
_ = await vertex2.GetLockAsync(CancellationToken.None).ConfigureAwait(false);
// Act
var lock3Task = vertex3.GetLockAsync(CancellationToken.None);
// Assert
lock3Task.IsCompleted.Should().BeTrue();
}
