public async Task TestFaultingAndCancellation()
{
foreach (bool fault in DataflowTestHelpers.BooleanValues)
{
var cts = new CancellationTokenSource();
var tb = new TransformBlock <int, int>(i => i, new ExecutionDataflowBlockOptions {
CancellationToken = cts.Token
});
tb.PostRange(0, 4);
Assert.Equal(expected: 0, actual: await tb.ReceiveAsync());
Assert.Equal(expected: 1, actual: await tb.ReceiveAsync());
if (fault)
{
Assert.Throws <ArgumentNullException>(() => ((IDataflowBlock)tb).Fault(null));
((IDataflowBlock)tb).Fault(new InvalidCastException());
await Assert.ThrowsAsync <InvalidCastException>(() => tb.Completion);
}
else
{
cts.Cancel();
await Assert.ThrowsAnyAsync <OperationCanceledException>(() => tb.Completion);
}
Assert.Equal(expected: 0, actual: tb.InputCount);
Assert.Equal(expected: 0, actual: tb.OutputCount);
}
}
public async Task TenTransformsToAction()
{
var first = new TransformBlock <int, int>(item => item);
TransformBlock <int, int> t = first;
for (int i = 0; i < 9; i++)
{
var next = new TransformBlock <int, int>(item => item);
t.LinkTo(next, new DataflowLinkOptions {
PropagateCompletion = true
});
t = next;
}
int completedCount = 0;
var last = new ActionBlock <int>(i => completedCount++);
t.LinkTo(last, new DataflowLinkOptions {
PropagateCompletion = true
});
first.PostRange(0, Iterations);
first.Complete();
await last.Completion;
Assert.Equal(expected: Iterations, actual: completedCount);
}
private static TransformBlock <int, string> ConstructTransformWithNMessages(int messagesCount)
{
var block = new TransformBlock <int, string>(i => i.ToString());
block.PostRange(0, messagesCount);
SpinWait.SpinUntil(() => block.OutputCount == messagesCount);
return(block);
}
public async Task TransformThroughFilterToAction()
{
int completedCount = 0;
var t = new TransformBlock<int, int>(i => i);
var c = new ActionBlock<int>(i => completedCount++);
t.LinkTo(c, new DataflowLinkOptions { PropagateCompletion = true }, i => true);
t.PostRange(0, Iterations);
t.Complete();
await c.Completion;
Assert.Equal(expected: Iterations, actual: completedCount);
}
[OuterLoop] // spins waiting for a condition to be true, though it should happen very quickly
public async Task TestCount()
{
var tb = new TransformBlock <int, int>(i => i);
Assert.Equal(expected: 0, actual: tb.InputCount);
Assert.Equal(expected: 0, actual: tb.OutputCount);
tb.PostRange(1, 11);
await Task.Run(() => SpinWait.SpinUntil(() => tb.OutputCount == 10));
for (int i = 10; i > 0; i--)
{
int item;
Assert.True(tb.TryReceive(out item));
Assert.Equal(expected: 11 - i, actual: item);
Assert.Equal(expected: i - 1, actual: tb.OutputCount);
}
}
public async Task TransformThroughFilterToAction()
{
int completedCount = 0;
var t = new TransformBlock <int, int>(i => i);
var c = new ActionBlock <int>(i => completedCount++);
t.LinkTo(c, new DataflowLinkOptions {
PropagateCompletion = true
}, i => true);
t.PostRange(0, Iterations);
t.Complete();
await c.Completion;
Assert.Equal(expected: Iterations, actual: completedCount);
}
public async Task TransformToAction()
{
var t = new TransformBlock<int, int>(i => i * 2);
int completedCount = 0;
int prev = -2;
var c = new ActionBlock<int>(i =>
{
completedCount++;
Assert.Equal(expected: i, actual: prev + 2);
prev = i;
});
t.LinkTo(c, new DataflowLinkOptions { PropagateCompletion = true });
t.PostRange(0, Iterations);
t.Complete();
await c.Completion;
Assert.True(completedCount == Iterations);
}
public async Task TenTransformsToAction()
{
var first = new TransformBlock<int, int>(item => item);
TransformBlock<int, int> t = first;
for (int i = 0; i < 9; i++)
{
var next = new TransformBlock<int, int>(item => item);
t.LinkTo(next, new DataflowLinkOptions { PropagateCompletion = true });
t = next;
}
int completedCount = 0;
var last = new ActionBlock<int>(i => completedCount++);
t.LinkTo(last, new DataflowLinkOptions { PropagateCompletion = true });
first.PostRange(0, Iterations);
first.Complete();
await last.Completion;
Assert.Equal(expected: Iterations, actual: completedCount);
}
public async Task TestOrdering()
{
const int iters = 1000;
foreach (int mmpt in new[] { DataflowBlockOptions.Unbounded, 1 })
{
foreach (int dop in new[] { 1, 2, DataflowBlockOptions.Unbounded })
{
var options = new ExecutionDataflowBlockOptions {
MaxDegreeOfParallelism = dop, MaxMessagesPerTask = mmpt
};
var tb = new TransformBlock <int, int>(i => i, options);
tb.PostRange(0, iters);
for (int i = 0; i < iters; i++)
{
Assert.Equal(expected: i, actual: await tb.ReceiveAsync());
}
tb.Complete();
await tb.Completion;
}
}
}
public async Task TransformToAction()
{
var t = new TransformBlock <int, int>(i => i * 2);
int completedCount = 0;
int prev = -2;
var c = new ActionBlock <int>(i =>
{
completedCount++;
Assert.Equal(expected: i, actual: prev + 2);
prev = i;
});
t.LinkTo(c, new DataflowLinkOptions {
PropagateCompletion = true
});
t.PostRange(0, Iterations);
t.Complete();
await c.Completion;
Assert.True(completedCount == Iterations);
}
public async Task TestOrdering_Async_OrderedDisabled()
{
// If ordering were enabled, this test would hang.
var options = new ExecutionDataflowBlockOptions { MaxDegreeOfParallelism = DataflowBlockOptions.Unbounded, EnsureOrdered = false };
var tasks = new TaskCompletionSource<int>[10];
for (int i = 0; i < tasks.Length; i++)
{
tasks[i] = new TaskCompletionSource<int>();
}
var tb = new TransformBlock<int, int>(i => tasks[i].Task, options);
tb.PostRange(0, tasks.Length);
for (int i = tasks.Length - 1; i >= 0; i--)
{
tasks[i].SetResult(i);
Assert.Equal(expected: i, actual: await tb.ReceiveAsync());
}
tb.Complete();
await tb.Completion;
}
[InlineData(2, 1, false)] // no force ordered, but dop == 1, so it doesn't matter
public async Task TestOrdering_Async_OrderedEnabled(int mmpt, int dop, bool? EnsureOrdered)
{
const int iters = 1000;
var options = new ExecutionDataflowBlockOptions { MaxDegreeOfParallelism = dop, MaxMessagesPerTask = mmpt };
if (EnsureOrdered == null)
{
Assert.True(options.EnsureOrdered);
}
else
{
options.EnsureOrdered = EnsureOrdered.Value;
}
var tb = new TransformBlock<int, int>(i => Task.FromResult(i), options);
tb.PostRange(0, iters);
for (int i = 0; i < iters; i++)
{
Assert.Equal(expected: i, actual: await tb.ReceiveAsync());
}
tb.Complete();
await tb.Completion;
}
public async Task TestNullTasksIgnored()
{
foreach (int dop in new[] { DataflowBlockOptions.Unbounded, 1, 2 })
{
var tb = new TransformBlock<int, int>(i => {
if ((i % 2) == 0) return null;
return Task.Run(() => i);
}, new ExecutionDataflowBlockOptions { MaxDegreeOfParallelism = dop });
const int Iters = 100;
tb.PostRange(0, Iters);
tb.Complete();
for (int i = 0; i < Iters; i++)
{
if ((i % 2) != 0)
{
Assert.Equal(expected: i, actual: await tb.ReceiveAsync());
}
}
await tb.Completion;
}
}
public async Task TestCancellationExceptionsIgnored()
{
var t = new TransformBlock<int, int>(i => {
if ((i % 2) == 0) throw new OperationCanceledException();
return i;
});
t.PostRange(0, 2);
t.Complete();
for (int i = 0; i < 2; i++)
{
if ((i % 2) != 0)
{
Assert.Equal(expected: i, actual: await t.ReceiveAsync());
}
}
await t.Completion;
}
public async Task TestFaultingAndCancellation()
{
foreach (bool fault in DataflowTestHelpers.BooleanValues)
{
var cts = new CancellationTokenSource();
var tb = new TransformBlock<int, int>(i => i, new ExecutionDataflowBlockOptions { CancellationToken = cts.Token });
tb.PostRange(0, 4);
Assert.Equal(expected: 0, actual: await tb.ReceiveAsync());
Assert.Equal(expected: 1, actual: await tb.ReceiveAsync());
if (fault)
{
Assert.Throws<ArgumentNullException>(() => ((IDataflowBlock)tb).Fault(null));
((IDataflowBlock)tb).Fault(new InvalidCastException());
await Assert.ThrowsAsync<InvalidCastException>(() => tb.Completion);
}
else
{
cts.Cancel();
await Assert.ThrowsAnyAsync<OperationCanceledException>(() => tb.Completion);
}
Assert.Equal(expected: 0, actual: tb.InputCount);
Assert.Equal(expected: 0, actual: tb.OutputCount);
}
}
[OuterLoop] // spins waiting for a condition to be true, though it should happen very quickly
public async Task TestCount()
{
var tb = new TransformBlock<int, int>(i => i);
Assert.Equal(expected: 0, actual: tb.InputCount);
Assert.Equal(expected: 0, actual: tb.OutputCount);
tb.PostRange(1, 11);
await Task.Run(() => SpinWait.SpinUntil(() => tb.OutputCount == 10));
for (int i = 10; i > 0; i--)
{
int item;
Assert.True(tb.TryReceive(out item));
Assert.Equal(expected: 11 - i, actual: item);
Assert.Equal(expected: i - 1, actual: tb.OutputCount);
}
}
public async Task TestOrdering()
{
const int iters = 1000;
foreach (int mmpt in new[] { DataflowBlockOptions.Unbounded, 1 })
foreach (int dop in new[] { 1, 2, DataflowBlockOptions.Unbounded })
{
var options = new ExecutionDataflowBlockOptions { MaxDegreeOfParallelism = dop, MaxMessagesPerTask = mmpt };
var tb = new TransformBlock<int, int>(i => i, options);
tb.PostRange(0, iters);
for (int i = 0; i < iters; i++)
{
Assert.Equal(expected: i, actual: await tb.ReceiveAsync());
}
tb.Complete();
await tb.Completion;
}
}