public void CounterAggregatorAggregatesCorrectlyWhenMultipleThreadsUpdatesLong()
{
// create an aggregator
var aggregator = new Int64CounterSumAggregator();
var sum = aggregator.ToMetricData() as Int64SumData;
// we start with 0.
Assert.Equal(0, sum.Sum);
// setup args to threads.
var mre = new ManualResetEvent(false);
var mreToEnsureAllThreadsStart = new ManualResetEvent(false);
var argToThread =
new UpdateThreadArguments <long>
{
CounterSumAggregator = aggregator,
ThreadsStartedCount = 0,
MreToBlockUpdateThread = mre,
MreToEnsureAllThreadsStart = mreToEnsureAllThreadsStart,
};
Thread[] t = new Thread[10];
for (int i = 0; i < 10; i++)
{
t[i] = new Thread(LongMetricUpdateThread);
t[i].Start(argToThread);
}
// Block until all 10 threads started.
mreToEnsureAllThreadsStart.WaitOne();
// kick-off all the threads.
mre.Set();
for (int i = 0; i < 10; i++)
{
// wait for all threads to complete
t[i].Join();
}
// check point.
aggregator.Checkpoint();
sum = aggregator.ToMetricData() as Int64SumData;
// 1000000 times 10 by each thread. times 10 as there are 10 threads
Assert.Equal(100000000, sum.Sum);
}
public void TracksStartAndEndTimesOfAggregation()
{
// create an aggregator
var aggregator = new Int64CounterSumAggregator();
aggregator.Update(1);
Thread.Sleep(TimeSpan.FromMilliseconds(1));
aggregator.Checkpoint();
var metricData = aggregator.ToMetricData();
aggregator.Update(2);
Thread.Sleep(TimeSpan.FromMilliseconds(1));
aggregator.Checkpoint();
var otherMetricData = aggregator.ToMetricData();
Assert.True(DateTime.Compare(metricData.StartTimestamp, metricData.Timestamp) < 0);
Assert.True(DateTime.Compare(metricData.Timestamp, otherMetricData.StartTimestamp) < 0);
Assert.True(
DateTime.Compare(
metricData.Timestamp.Add(TimeSpan.FromTicks(1)),
otherMetricData.StartTimestamp) == 0);
Assert.True(DateTime.Compare(otherMetricData.StartTimestamp, otherMetricData.Timestamp) < 0);
}
