Move and deprecate InMemoryMetricExporter (#3987)

opencensus-shim/src/test/java/io/opentelemetry/opencensusshim/OpenTelemetryMetricExporterTest.java

@@ -23,7 +23,7 @@
 import io.opencensus.tags.Tagger;
 import io.opencensus.tags.Tags;
 import io.opentelemetry.sdk.metrics.data.MetricData;
-import io.opentelemetry.sdk.metrics.testing.InMemoryMetricExporter;
+import io.opentelemetry.sdk.testing.exporter.InMemoryMetricExporter;
 import java.util.Comparator;
 import java.util.HashSet;
 import java.util.Set;

perf-harness/build.gradle.kts

@@ -9,6 +9,7 @@ dependencies {
   implementation(project(":api:all"))
   implementation(project(":sdk:all"))
   implementation(project(":sdk:testing"))
+  implementation(project(":sdk:metrics-testing"))
   implementation(project(":exporters:otlp:trace"))
   implementation(project(":exporters:logging"))
   implementation(project(":semconv"))

perf-harness/src/test/java/io/opentelemetry/perf/OtlpPipelineStressTest.java

@@ -22,8 +22,8 @@
 import io.opentelemetry.sdk.metrics.data.MetricData;
 import io.opentelemetry.sdk.metrics.data.PointData;
 import io.opentelemetry.sdk.metrics.export.PeriodicMetricReader;
-import io.opentelemetry.sdk.metrics.testing.InMemoryMetricExporter;
 import io.opentelemetry.sdk.resources.Resource;
+import io.opentelemetry.sdk.testing.exporter.InMemoryMetricExporter;
 import io.opentelemetry.sdk.trace.SdkTracerProvider;
 import io.opentelemetry.sdk.trace.export.BatchSpanProcessor;
 import io.opentelemetry.semconv.resource.attributes.ResourceAttributes;

sdk/metrics-testing/src/main/java/io/opentelemetry/sdk/testing/assertj/metrics/package-info.java

@@ -0,0 +1,9 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+@ParametersAreNonnullByDefault
+package io.opentelemetry.sdk.testing.assertj.metrics;
+
+import javax.annotation.ParametersAreNonnullByDefault;

sdk/metrics-testing/src/main/java/io/opentelemetry/sdk/testing/exporter/InMemoryMetricExporter.java

@@ -0,0 +1,138 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.sdk.testing.exporter;
+
+import io.opentelemetry.sdk.common.CompletableResultCode;
+import io.opentelemetry.sdk.metrics.data.AggregationTemporality;
+import io.opentelemetry.sdk.metrics.data.MetricData;
+import io.opentelemetry.sdk.metrics.export.MetricExporter;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Queue;
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+/**
+ * A {@link MetricExporter} implementation that can be used to test OpenTelemetry integration.
+ *
+ * <p>Can be created using {@code InMemoryMetricExporter.create()}
+ *
+ * <p>Example usage:
+ *
+ * <pre><code>
+ * public class InMemoryMetricExporterExample {
+ *
+ *   // creating InMemoryMetricExporter
+ *   private final InMemoryMetricExporter exporter = InMemoryMetricExporter.create();
+ *   private final MeterSdkProvider meterSdkProvider = OpenTelemetrySdk.getMeterProvider();
+ *   private final Meter meter = meterSdkProvider.get("InMemoryMetricExporterExample");
+ *   private IntervalMetricReader intervalMetricReader;
+ *
+ *   void setup() {
+ *     intervalMetricReader =
+ *         IntervalMetricReader.builder()
+ *             .setMetricExporter(exporter)
+ *             .setMetricProducers(Collections.singletonList(meterSdkProvider.getMetricProducer()))
+ *             .setExportIntervalMillis(1000)
+ *             .build();
+ *   }
+ *
+ *   LongCounter generateLongCounterMeter(String name) {
+ *     return meter.longCounterBuilder(name).setDescription("Sample LongCounter").build();
+ *   }
+ *
+ *   public static void main(String[] args) throws InterruptedException {
+ *     InMemoryMetricExporterExample example = new InMemoryMetricExporterExample();
+ *     example.setup();
+ *     example.generateLongCounterMeter("counter-1");
+ *   }
+ * }
+ * </code></pre>
+ */
+public final class InMemoryMetricExporter implements MetricExporter {
+  private final Queue<MetricData> finishedMetricItems = new ConcurrentLinkedQueue<>();
+  private final AggregationTemporality preferredTemporality;
+  private boolean isStopped = false;
+
+  private InMemoryMetricExporter(AggregationTemporality preferredTemporality) {
+    this.preferredTemporality = preferredTemporality;
+  }
+
+  /**
+   * Returns a new {@link InMemoryMetricExporter} with a preferred temporality of {@link
+   * AggregationTemporality#CUMULATIVE}.
+   */
+  public static InMemoryMetricExporter create() {
+    return create(AggregationTemporality.CUMULATIVE);
+  }
+
+  /** Returns a new {@link InMemoryMetricExporter} with the given {@code preferredTemporality}. */
+  public static InMemoryMetricExporter create(AggregationTemporality preferredTemporality) {
+    return new InMemoryMetricExporter(preferredTemporality);
+  }
+
+  /**
+   * Returns a {@code List} of the finished {@code Metric}s, represented by {@code MetricData}.
+   *
+   * @return a {@code List} of the finished {@code Metric}s.
+   */
+  public List<MetricData> getFinishedMetricItems() {
+    return Collections.unmodifiableList(new ArrayList<>(finishedMetricItems));
+  }
+
+  /**
+   * Clears the internal {@code List} of finished {@code Metric}s.
+   *
+   * <p>Does not reset the state of this exporter if already shutdown.
+   */
+  public void reset() {
+    finishedMetricItems.clear();
+  }
+
+  @Override
+  public AggregationTemporality getPreferredTemporality() {
+    return preferredTemporality;
+  }
+
+  /**
+   * Exports the collection of {@code Metric}s into the inmemory queue.
+   *
+   * <p>If this is called after {@code shutdown}, this will return {@code ResultCode.FAILURE}.
+   */
+  @Override
+  public CompletableResultCode export(Collection<MetricData> metrics) {
+    if (isStopped) {
+      return CompletableResultCode.ofFailure();
+    }
+    finishedMetricItems.addAll(metrics);
+    return CompletableResultCode.ofSuccess();
+  }
+
+  /**
+   * The InMemory exporter does not batch metrics, so this method will immediately return with
+   * success.
+   *
+   * @return always Success
+   */
+  @Override
+  public CompletableResultCode flush() {
+    return CompletableResultCode.ofSuccess();
+  }
+
+  /**
+   * Clears the internal {@code List} of finished {@code Metric}s.
+   *
+   * <p>Any subsequent call to export() function on this MetricExporter, will return {@code
+   * CompletableResultCode.ofFailure()}
+   */
+  @Override
+  public CompletableResultCode shutdown() {
+    isStopped = true;
+    finishedMetricItems.clear();
+    return CompletableResultCode.ofSuccess();
+  }
+}

sdk/metrics-testing/src/main/java/io/opentelemetry/sdk/testing/exporter/package-info.java

@@ -0,0 +1,9 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+@ParametersAreNonnullByDefault
+package io.opentelemetry.sdk.testing.exporter;
+
+import javax.annotation.ParametersAreNonnullByDefault;

sdk/metrics/src/test/java/io/opentelemetry/sdk/metrics/testing/InMemoryMetricExporterTest.java → sdk/metrics-testing/src/test/java/io/opentelemetry/sdk/testing/exporter/InMemoryMetricExporterTest.java

@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-package io.opentelemetry.sdk.metrics.testing;
+package io.opentelemetry.sdk.testing.exporter;
 
 import static org.assertj.core.api.Assertions.assertThat;
 

sdk/metrics/src/main/java/io/opentelemetry/sdk/metrics/testing/InMemoryMetricExporter.java

@@ -52,7 +52,10 @@
  *   }
  * }
  * </code></pre>
+ *
+ * @deprecated Moved to {@code io.opentelemetry:opentelemetry-sdk-metrics-testing} module.
  */
+@Deprecated
 public final class InMemoryMetricExporter implements MetricExporter {
   private final Queue<MetricData> finishedMetricItems = new ConcurrentLinkedQueue<>();
   private final AggregationTemporality preferredTemporality;

sdk/metrics/src/test/java/io/opentelemetry/sdk/metrics/testing/InMemoryMetricReaderDeltaTest.java

@@ -8,6 +8,7 @@
 import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.assertThat;
 
 import io.opentelemetry.sdk.metrics.SdkMeterProvider;
+import io.opentelemetry.sdk.testing.exporter.InMemoryMetricExporter;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;