public async Task TestRunInParallel_ParallelismDegree(int totalTasks, int maxDegreeOfParallelism)
{
VisitorsCounter visitorsCounter = new VisitorsCounter(maxDegreeOfParallelism);
await TaskUtils.RunInParallel(((Func <Task>)(async() =>
{
visitorsCounter.Enter();
await Task.Delay(RUNNING_TIME);
visitorsCounter.Leave();
})).Repeat(totalTasks), maxDegreeOfParallelism);
Assert.Zero(visitorsCounter.CurrentVisitors);
Assert.AreEqual(totalTasks, visitorsCounter.TotalVisitors);
Assert.AreEqual(Math.Min(maxDegreeOfParallelism, totalTasks), visitorsCounter.MaxConcurrentVisitors);
}
public void TestRunInParallel_ErrorHandling(ICollection <bool> whenToThrowException, int maxDegreeOfParallelism)
{
VisitorsCounter visitorsCounter = new VisitorsCounter(maxDegreeOfParallelism);
IEnumerable <Func <Task> > opeartions = whenToThrowException.Select((toThrow) => (Func <Task>)(async() =>
{
visitorsCounter.Enter();
await Task.Delay(RUNNING_TIME);
visitorsCounter.Leave();
if (toThrow)
{
throw new ArgumentException();
}
}));
int errorsNumber = whenToThrowException.Count((b) => b);
Assert.AreEqual(errorsNumber,
Assert.ThrowsAsync <AggregateException>(() => TaskUtils.RunInParallel(opeartions, maxDegreeOfParallelism)).InnerExceptions.Count);
Assert.Zero(visitorsCounter.CurrentVisitors);
Assert.AreEqual(whenToThrowException.Count, visitorsCounter.TotalVisitors);
Assert.AreEqual(Math.Min(maxDegreeOfParallelism, whenToThrowException.Count), visitorsCounter.MaxConcurrentVisitors);
}
