[Instrumentation.EventCounters] Stabilize and Enable Testing

.github/component_owners.yml

@@ -37,6 +37,7 @@ components:
     - ejsmith
   src/OpenTelemetry.Instrumentation.EventCounters/:
     - hananiel
+    - mic-max
   src/OpenTelemetry.Instrumentation.GrpcCore/:
     - pcwiese
   src/OpenTelemetry.Instrumentation.Hangfire/:
@@ -99,6 +100,7 @@ components:
     - ejsmith
   test/OpenTelemetry.Instrumentation.EventCounters.Tests/:
     - hananiel
+    - mic-max
   test/OpenTelemetry.Instrumentation.GrpcCore.Tests/:
     - pcwiese
   test/OpenTelemetry.Instrumentation.Hangfire.Tests/:

src/OpenTelemetry.Instrumentation.EventCounters/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+* Simplified implementation. EventSources must be explicitly configured to be
+  listened to now.
+  ([#620](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/620))
+
 ## 0.1.0-alpha.1
 
 Released 2022-Jul-12

src/OpenTelemetry.Instrumentation.EventCounters/EventCountersInstrumentationOptions.cs

@@ -0,0 +1,57 @@
+// <copyright file="EventCountersInstrumentationOptions.cs" company="OpenTelemetry Authors">
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+
+using System;
+using System.Collections.Generic;
+
+namespace OpenTelemetry.Instrumentation.EventCounters;
+
+/// <summary>
+/// EventCounterListener Options.
+/// </summary>
+public class EventCountersInstrumentationOptions
+{
+    private readonly HashSet<string> eventSourceNames = new();
+
+    /// <summary>
+    /// Gets or sets the subscription interval in seconds.
+    /// </summary>
+    public int RefreshIntervalSecs { get; set; } = 1;
+
+    /// <summary>
+    /// Listens to EventCounters from the given EventSource name.
+    /// </summary>
+    /// <param name="eventSourceName">The EventSource name.</param>
+    public void AddEventSource(string eventSourceName)
+    {
+        if (eventSourceName == "System.Runtime")
+        {
+            throw new NotSupportedException("Use the `OpenTelemetry.Instrumentation.Runtime` instrumentation.");
+        }
+
+        this.eventSourceNames.Add(eventSourceName);
+    }
+
+    /// <summary>
+    /// Returns whether or not an EventSource should be enabled on the EventListener.
+    /// </summary>
+    /// <param name="eventSourceName">The EventSource name.</param>
+    /// <returns><c>true</c> when an EventSource with the name <paramref name="eventSourceName"/> should be enabled.</returns>
+    internal bool ShouldListenToSource(string eventSourceName)
+    {
+        return this.eventSourceNames.Contains(eventSourceName);
+    }
+}