Add support for IDeferredTracerProviderBuilder for InMemoryExporter (#…

…2129) * Add support for IDeferredTracerProviderBuilder * Update CHANGELOG.md
open-telemetry · Jul 12, 2021 · 5b06d2a · 5b06d2a
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diff --git a/src/OpenTelemetry.Exporter.InMemory/CHANGELOG.md b/src/OpenTelemetry.Exporter.InMemory/CHANGELOG.md
@@ -9,6 +9,9 @@ please check the latest changes
 
 ## Unreleased
 
+* Supports OpenTelemetry.Extensions.Hosting based configuration for `InMemoryExporter`
+  ([#2129](https://github.com/open-telemetry/opentelemetry-dotnet/pull/2129))
+
 ## 1.1.0-rc1
 
 Released 2021-Jun-25

diff --git a/src/OpenTelemetry.Exporter.InMemory/InMemoryExporterHelperExtensions.cs b/src/OpenTelemetry.Exporter.InMemory/InMemoryExporterHelperExtensions.cs
@@ -42,6 +42,14 @@ public static TracerProviderBuilder AddInMemoryExporter(this TracerProviderBuild
                 throw new ArgumentNullException(nameof(exportedItems));
             }
 
+            if (builder is IDeferredTracerProviderBuilder deferredTracerProviderBuilder)
+            {
+                return deferredTracerProviderBuilder.Configure((sp, builder) =>
+                {
+                    builder.AddProcessor(new SimpleActivityExportProcessor(new InMemoryExporter<Activity>(exportedItems)));
+                });
+            }
+
             return builder.AddProcessor(new SimpleActivityExportProcessor(new InMemoryExporter<Activity>(exportedItems)));
         }
     }