private void TestScheduleLaggyTaskAtFixedRate(IEventLoop loopA)
{
var timestamps = new BlockingCollection <long>();
int expectedTimeStamps = 5;
var allTimeStampsLatch = new CountdownEvent(expectedTimeStamps);
var f = loopA.ScheduleAtFixedRate(() =>
{
var empty = timestamps.Count == 0;
timestamps.Add(Stopwatch.GetTimestamp());
if (empty)
{
try
{
Thread.Sleep(401);
}
catch { }
}
allTimeStampsLatch.Signal();
}, TimeSpan.FromMilliseconds(100), TimeSpan.FromMilliseconds(100));
Assert.True(allTimeStampsLatch.Wait(TimeSpan.FromMinutes(1)));
Assert.True(f.Cancel());
Thread.Sleep(300);
Assert.Equal(expectedTimeStamps, timestamps.Count);
// Check if the task was run with lag.
int i = 0;
long?previousTimestamp = null;
foreach (long t in timestamps)
{
if (previousTimestamp == null)
{
previousTimestamp = t;
continue;
}
long diff = t - previousTimestamp.Value;
if (i == 0)
{
Assert.True(diff >= PreciseTime.ToDelayNanos(TimeSpan.FromMilliseconds(400)));
}
else
{
Assert.True(diff <= PreciseTime.ToDelayNanos(TimeSpan.FromMilliseconds(10)));
}
previousTimestamp = t;
i++;
}
}
private void TestScheduleTaskAtFixedRate(IEventLoop loopA)
{
var timestamps = new BlockingCollection <long>();
int expectedTimeStamps = 5;
var allTimeStampsLatch = new CountdownEvent(expectedTimeStamps);
var f = loopA.ScheduleAtFixedRate(() =>
{
timestamps.Add(Stopwatch.GetTimestamp());
try
{
Thread.Sleep(50);
}
catch { }
allTimeStampsLatch.Signal();
}, TimeSpan.FromMilliseconds(100), TimeSpan.FromMilliseconds(100));
Assert.True(allTimeStampsLatch.Wait(TimeSpan.FromMinutes(1)));
Assert.True(f.Cancel());
Thread.Sleep(300);
Assert.Equal(expectedTimeStamps, timestamps.Count);
// Check if the task was run without a lag.
long?firstTimestamp = null;
int cnt = 0;
foreach (long t in timestamps)
{
if (firstTimestamp == null)
{
firstTimestamp = t;
continue;
}
long timepoint = t - firstTimestamp.Value;
Assert.True(timepoint >= PreciseTime.ToDelayNanos(TimeSpan.FromMilliseconds(100 * cnt + 80)));
Assert.True(timepoint <= PreciseTime.ToDelayNanos(TimeSpan.FromMilliseconds(100 * (cnt + 1) + 20)));
cnt++;
}
}