public static void RespectsMaxConcurrency()
{
var stack = new StackPolicy(Options.Create(new QueuePolicyOptions
{
MaxConcurrentRequests = 2,
RequestQueueLimit = 2,
}));
var task1 = stack.TryEnterAsync();
Assert.True(task1.IsCompleted);
var task2 = stack.TryEnterAsync();
Assert.True(task2.IsCompleted);
var task3 = stack.TryEnterAsync();
Assert.False(task3.IsCompleted);
}
public async Task BaseFunctionality()
{
var stack = new StackPolicy(Options.Create(new QueuePolicyOptions
{
MaxConcurrentRequests = 1,
RequestQueueLimit = 2,
}));
var task1 = stack.TryEnterAsync();
Assert.True(task1.IsCompleted);
Assert.True(await task1);
var task2 = stack.TryEnterAsync();
Assert.False(task2.IsCompleted);
stack.OnExit();
Assert.True(await task2);
stack.OnExit();
}
public static void ExitRequestsPreserveSemaphoreState()
{
var stack = new StackPolicy(Options.Create(new QueuePolicyOptions {
MaxConcurrentRequests = 1,
RequestQueueLimit = 2,
}));
var task1 = stack.TryEnterAsync();
Assert.True(task1.IsCompleted && task1.Result);
var task2 = stack.TryEnterAsync();
Assert.False(task2.IsCompleted);
stack.OnExit(); // t1 exits, should free t2 to return
Assert.True(task2.IsCompleted && task2.Result);
stack.OnExit(); // t2 exists, there's now a free spot in server
var task3 = stack.TryEnterAsync();
Assert.True(task3.IsCompleted && task3.Result);
}
public async Task OldestRequestOverwritten()
{
var stack = new StackPolicy(Options.Create(new QueuePolicyOptions
{
MaxConcurrentRequests = 1,
RequestQueueLimit = 3,
}));
var task1 = stack.TryEnterAsync();
Assert.True(task1.IsCompleted);
var task2 = stack.TryEnterAsync();
Assert.False(task2.IsCompleted);
var task3 = stack.TryEnterAsync();
Assert.False(task3.IsCompleted);
var task4 = stack.TryEnterAsync();
Assert.False(task4.IsCompleted);
// It should drop the oldest item, but instead it fails to add the new one.
// https://github.com/dotnet/runtime/issues/62817
var task5 = stack.TryEnterAsync();
Assert.True(task5.IsCompleted);
Assert.False(await task5);
// Should have been pushed out of the stack
// Assert.False(await task2);
Assert.False(task2.IsCompleted);
Assert.False(task3.IsCompleted);
Assert.False(task4.IsCompleted);
}
public ResettableBooleanCompletionSource(StackPolicy queue)
{
_queue = queue;
_valueTaskSource.RunContinuationsAsynchronously = true;
}
