public Metric(string name, TelemetryClient telemetryClient)
{
Name = name ?? "null";
_aggregator = new MetricAggregator(DateTimeOffset.UtcNow);
_telemetryClient = telemetryClient ?? throw new ArgumentNullException(nameof(telemetryClient));
Task.Run(AggregatorLoopAsync);
}
public void TrackValue(double value)
{
MetricAggregator currAggregator = _aggregator;
if (currAggregator != null)
{
currAggregator.TrackValue(value);
}
}
private async Task AggregatorLoopAsync()
{
while (_isDisposed == false)
{
try
{
// Wait for end end of the aggregation period:
await Task.Delay(AggregationPeriod).ConfigureAwait(continueOnCapturedContext: false);
// Atomically snap the current aggregation:
MetricAggregator nextAggregator = new MetricAggregator(DateTimeOffset.UtcNow);
MetricAggregator prevAggregator = Interlocked.Exchange(ref _aggregator, nextAggregator);
// Only send anything is at least one value was measured:
if (prevAggregator != null && prevAggregator.Count > 0)
{
// Compute the actual aggregation period length:
TimeSpan aggPeriod = nextAggregator.StartTimestamp - prevAggregator.StartTimestamp;
if (aggPeriod.TotalMilliseconds < 1)
{
aggPeriod = TimeSpan.FromMilliseconds(1);
}
// Construct the metric telemetry item and send:
var aggregatedMetricTelemetry = new MetricTelemetry(
Name,
prevAggregator.Count,
prevAggregator.Sum,
prevAggregator.Min,
prevAggregator.Max,
prevAggregator.StandardDeviation);
aggregatedMetricTelemetry.Properties["AggregationPeriod"] = aggPeriod.ToString("c");
_telemetryClient.Track(aggregatedMetricTelemetry);
}
}
catch (Exception)
{
//TODO log it for now just stop the error.
}
}
}
void IDisposable.Dispose()
{
_isDisposed = true;
_aggregator = null;
}
