public void FetchAndTrackMetrics()
{
// We know that GetNextCycleTargetTime(..) tries to snap cycles to 1 second into each minute.
// But the timer wakes us up *approxumately* at that time. If we are within a few seconds of that time, we will snap exactly to that time.
// If we are further away, we will just snap to a whole second. That way downstream systems do not need to worry about sub-second resolution.
DateTimeOffset now = DateTimeOffset.Now;
if (new DateTimeOffset(now.Year, now.Month, now.Day, now.Hour, now.Minute, 0, now.Offset) <= now &&
new DateTimeOffset(now.Year, now.Month, now.Day, now.Hour, now.Minute, 4, now.Offset) >= now)
{
now = new DateTimeOffset(now.Year, now.Month, now.Day, now.Hour, now.Minute, 1, now.Offset);
}
else
{
now = Util.RoundDownToSecond(now);
}
AggregationPeriodSummary aggregates = this.aggregationManager.StartOrCycleAggregators(
MetricAggregationCycleKind.Default,
futureFilter: null,
tactTimestamp: now);
if (aggregates != null)
{
Task fireAndForget = Task.Run(() => this.metricManager.TrackMetricAggregates(aggregates, flush: false));
}
}
// @PublicExposureCandidate
internal MetricAggregate GetCurrentAggregateUnsafe(MetricAggregationCycleKind aggregationCycleKind, DateTimeOffset dateTime)
{
IMetricSeriesAggregator aggregator = null;
if (this.requiresPersistentAggregator)
{
aggregator = this.aggregatorPersistent;
}
else
{
switch (aggregationCycleKind)
{
case CycleKind.Default:
aggregator = UnwrapAggregator(this.aggregatorDefault);
break;
case CycleKind.QuickPulse:
aggregator = UnwrapAggregator(this.aggregatorQuickPulse);
break;
case CycleKind.Custom:
aggregator = UnwrapAggregator(this.aggregatorCustom);
break;
default:
throw new ArgumentException(Invariant($"Unexpected value of {nameof(aggregationCycleKind)}: {aggregationCycleKind}."));
}
}
dateTime = Util.RoundDownToSecond(dateTime);
MetricAggregate aggregate = aggregator?.CreateAggregateUnsafe(dateTime);
return(aggregate);
}
// @PublicExposureCandidate
internal void ResetAggregation(DateTimeOffset periodStart)
{
periodStart = Util.RoundDownToSecond(periodStart);
if (this.requiresPersistentAggregator)
{
IMetricSeriesAggregator aggregator = this.aggregatorPersistent;
aggregator?.Reset(periodStart);
}
else
{
{
IMetricSeriesAggregator aggregator = UnwrapAggregator(this.aggregatorDefault);
aggregator?.Reset(periodStart);
}
{
IMetricSeriesAggregator aggregator = UnwrapAggregator(this.aggregatorQuickPulse);
aggregator?.Reset(periodStart);
}
{
IMetricSeriesAggregator aggregator = UnwrapAggregator(this.aggregatorCustom);
aggregator?.Reset(periodStart);
}
}
}
private AggregationPeriodSummary CycleAggregators(
ref AggregatorCollection aggregators,
DateTimeOffset tactTimestamp,
IMetricSeriesFilter futureFilter,
bool stopAggregators)
{
if (aggregators == _aggregatorsForPersistent)
{
throw new InvalidOperationException("Invernal SDK bug. Please report. Cannot cycle persistent aggregators.");
}
tactTimestamp = Util.RoundDownToSecond(tactTimestamp);
// For non-persistent aggregators: create empty holder for the next aggregation period and swap for the previous holder:
AggregatorCollection prevAggregators;
if (stopAggregators)
{
prevAggregators = Interlocked.Exchange(ref aggregators, null);
}
else
{
AggregatorCollection nextAggregators = new AggregatorCollection(tactTimestamp, futureFilter);
prevAggregators = Interlocked.Exchange(ref aggregators, nextAggregators);
}
List <MetricAggregate> persistentValsAggregations = GetPersistentAggregations(tactTimestamp, prevAggregators?.Filter);
List <MetricAggregate> nonpersistentAggregations = GetNonpersistentAggregations(tactTimestamp, prevAggregators);
var summary = new AggregationPeriodSummary(persistentValsAggregations, nonpersistentAggregations);
return(summary);
}
internal MetricAggregationManager()
{
DateTimeOffset now = DateTimeOffset.Now;
DateTimeOffset timestamp = Util.RoundDownToSecond(now);
_aggregatorsForDefault = new AggregatorCollection(timestamp, filter: null);
_aggregatorsForPersistent = new AggregatorCollection(timestamp, filter: null);
}