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92 changes: 92 additions & 0 deletions
92
Microsoft.Azure.Cosmos.Samples/Tools/Benchmark/CosmosBenchmarkEventListener.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| namespace CosmosBenchmark | ||
| { | ||
| using System; | ||
| using System.Diagnostics.Tracing; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
| using OpenTelemetry.Metrics; | ||
|
|
||
| internal class CosmosBenchmarkEventListener : EventListener | ||
| { | ||
| static readonly string CosmosBenchmarkEventSourceName = "Azure.Cosmos.Benchmark"; | ||
|
|
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| private readonly MeterProvider meterProvider; | ||
| private readonly MetricsCollector[] metricsCollectors; | ||
| private readonly MetricCollectionWindow metricCollectionWindow; | ||
| private const int WindowCheckInterval = 10; | ||
|
|
||
| public CosmosBenchmarkEventListener(MeterProvider meterProvider, BenchmarkConfig config) | ||
| { | ||
| this.meterProvider = meterProvider; | ||
| this.metricCollectionWindow ??= new MetricCollectionWindow(config.MetricsReportingIntervalInSec); | ||
|
|
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| this.metricsCollectors = new MetricsCollector[Enum.GetValues<BenchmarkOperationType>().Length]; | ||
| foreach (BenchmarkOperationType entry in Enum.GetValues<BenchmarkOperationType>()) | ||
| { | ||
| this.metricsCollectors[(int)entry] = new MetricsCollector(entry); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Flush metrics every <see cref="AppConfig.MetricsReportingIntervalInSec"/> | ||
| /// </summary> | ||
| ThreadPool.QueueUserWorkItem(async state => | ||
| { | ||
| while (true) | ||
| { | ||
| // Reset metricCollectionWindow and flush. | ||
| if (this.metricCollectionWindow.IsInvalid()) | ||
| { | ||
| this.meterProvider.ForceFlush(); | ||
| this.metricCollectionWindow.Reset(); | ||
| } | ||
| await Task.Delay(TimeSpan.FromMilliseconds(CosmosBenchmarkEventListener.WindowCheckInterval)); | ||
| } | ||
| }); | ||
| } | ||
|
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|
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|
|
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| /// <summary> | ||
| /// Override this method to get a list of all the eventSources that exist. | ||
| /// </summary> | ||
| protected override void OnEventSourceCreated(EventSource eventSource) | ||
| { | ||
| // Because we want to turn on every EventSource, we subscribe to a callback that triggers | ||
| // when new EventSources are created. It is also fired when the EventListener is created | ||
| // for all pre-existing EventSources. Thus this callback get called once for every | ||
| // EventSource regardless of the order of EventSource and EventListener creation. | ||
|
|
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| // For any EventSource we learn about, turn it on. | ||
| if (eventSource.Name == CosmosBenchmarkEventSourceName) | ||
| { | ||
| this.EnableEvents(eventSource, EventLevel.Informational, EventKeywords.All); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// We override this method to get a callback on every event we subscribed to with EnableEvents | ||
| /// </summary> | ||
| /// <param name="eventData"></param> | ||
| protected override void OnEventWritten(EventWrittenEventArgs eventData) | ||
| { | ||
| if (eventData.EventId == 2 // Successful | ||
| || eventData.EventId == 3) // Failure | ||
| { | ||
| int operationTypeIndex = (int)eventData.Payload[0]; | ||
| double durationInMs = (double)eventData.Payload[1]; | ||
|
|
||
| switch (eventData.EventId) | ||
| { | ||
| case 2: | ||
| this.metricsCollectors[operationTypeIndex].OnOperationSuccess(durationInMs); | ||
| break; | ||
| case 3: | ||
| this.metricsCollectors[operationTypeIndex].OnOperationFailure(durationInMs); | ||
| break; | ||
| default: | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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