public async Task EnsureNestedCallsAreExcecutedDirectly()
{
const int NumberOfTasks = 10;
var sequencer = new SequencialTaskExecutor();
List <Task> tasks = new List <Task>();
List <int> sequences = new List <int>();
for (int i = 0; i < NumberOfTasks; i++)
{
int num = i;
tasks.Add(sequencer.ExecuteTask(async() =>
{
Func <Task> func = async() =>
{
await sequencer.ExecuteTask(async() =>
{
await Task.Delay(1).ConfigureAwait(false);
sequences.Add(num);
});
};
await func().ConfigureAwait(false);
}));
}
await Task.WhenAll(tasks.ToArray());
for (int i = 0; i < NumberOfTasks; i++)
{
Assert.Equal(i, sequences[i]);
}
}
public void CalltoDisposedObjectShouldThrow()
{
var sequencer = new SequencialTaskExecutor();
sequencer.Dispose();
Assert.Throws <ObjectDisposedException>(() => { sequencer.ExecuteTask(() => Task.CompletedTask); });
}
public async Task EnsureTasksAreRunInOrder()
{
const int NumberOfTasks = 25;
var sequencer = new SequencialTaskExecutor();
var tasks = new List <Task>();
var sequences = new List <int>();
for (int i = 0; i < NumberOfTasks; i++)
{
int num = i;
tasks.Add(sequencer.ExecuteTask(async() =>
{
async Task func()
{
await Task.Delay(1).ConfigureAwait(false);
sequences.Add(num);
}
await func().ConfigureAwait(false);
}));
}
await Task.WhenAll(tasks.ToArray());
for (int i = 0; i < NumberOfTasks; i++)
{
Assert.Equal(i, sequences[i]);
}
}
public async Task EnsureTasksCancelledWhenDisposed()
{
const int NumberOfTasks = 10;
var sequencer = new SequencialTaskExecutor();
List <Task> tasks = new List <Task>();
for (int i = 0; i < NumberOfTasks; i++)
{
int num = i;
tasks.Add(sequencer.ExecuteTask(async() =>
{
Func <Task> func = async() =>
{
await Task.Delay(100).ConfigureAwait(false);
};
await func().ConfigureAwait(false);
}));
}
sequencer.Dispose();
try
{
await Task.WhenAll(tasks.ToArray());
Assert.False(true);
}
catch (OperationCanceledException)
{
bool mustBeCancelled = false;
for (int i = 0; i < NumberOfTasks; i++)
{
// The first task or two may already be running. So we skip completed tasks until we find
// one that is is cancelled
if (mustBeCancelled)
{
Assert.True(tasks[i].IsCanceled);
}
else
{
// All remaining tasks should be cancelled
mustBeCancelled = tasks[i].IsCanceled;
}
}
Assert.True(mustBeCancelled);
}
}
