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[release/8.0] Only initialize listeners once (#90932)
* Only initialize listeners once. * Add test * Second call --------- Co-authored-by: Chris R <Tratcher@outlook.com>
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44 changes: 44 additions & 0 deletions
44
src/libraries/Microsoft.Extensions.Diagnostics/tests/MetricsSubscriptionManagerTests.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
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| using System; | ||
| using System.Collections.Generic; | ||
| using System.Diagnostics.Metrics; | ||
| using Microsoft.Extensions.DependencyInjection; | ||
| using Microsoft.Extensions.Diagnostics.Metrics; | ||
| using Microsoft.Extensions.Options; | ||
| using Xunit; | ||
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| namespace Microsoft.Extensions.Diagnostics.Tests | ||
| { | ||
| public class MetricsSubscriptionManagerTests | ||
| { | ||
| [Fact] | ||
| public void AddMetrics_InitializesListeners() | ||
| { | ||
| var serviceCollection = new ServiceCollection(); | ||
| serviceCollection.AddMetrics(); // Duplicate call, should not add things twice. | ||
| serviceCollection.AddMetrics(l => l.AddListener<FakeListener>()); | ||
| var serviceProvider = serviceCollection.BuildServiceProvider(); | ||
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| // Make sure the subscription manager is started. | ||
| serviceProvider.GetRequiredService<IStartupValidator>().Validate(); | ||
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| var listeners = serviceProvider.GetRequiredService<IEnumerable<IMetricsListener>>(); | ||
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| var listener = Assert.Single(listeners); | ||
| var fakeListener = Assert.IsType<FakeListener>(listener); | ||
| Assert.Equal(1, fakeListener.InitializeCount); | ||
| } | ||
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| private class FakeListener : IMetricsListener | ||
| { | ||
| public string Name => "Fake"; | ||
| public int InitializeCount { get; private set; } | ||
| public MeasurementHandlers GetMeasurementHandlers() => new MeasurementHandlers(); | ||
| public void Initialize(IObservableInstrumentsSource source) => InitializeCount++; | ||
| public bool InstrumentPublished(Instrument instrument, out object? userState) => throw new NotImplementedException(); | ||
| public void MeasurementsCompleted(Instrument instrument, object? userState) => throw new NotImplementedException(); | ||
| } | ||
| } | ||
| } |