Add xray configurable sampler (#64)

* Add xray configurable sampler

* Check name

Author: Anuraag Agrawal

aws-xray/build.gradle.kts

@@ -15,17 +15,23 @@ dependencies {
     api("io.opentelemetry:opentelemetry-api")
     api("io.opentelemetry:opentelemetry-sdk-trace")
 
+    compileOnly("io.opentelemetry:opentelemetry-sdk-extension-autoconfigure")
+
     implementation("io.opentelemetry:opentelemetry-semconv")
 
     compileOnly("org.checkerframework:checker-qual")
 
+    annotationProcessor("com.google.auto.service:auto-service")
+    compileOnly("com.google.auto.service:auto-service-annotations")
+
     annotationProcessor("com.google.auto.value:auto-value")
     compileOnly("com.google.auto.value:auto-value-annotations")
 
     implementation("com.fasterxml.jackson.core:jackson-core")
     implementation("com.fasterxml.jackson.core:jackson-databind")
 
     testImplementation("com.linecorp.armeria:armeria-junit5")
+    testImplementation("io.opentelemetry:opentelemetry-sdk-extension-autoconfigure")
     testImplementation("io.opentelemetry:opentelemetry-sdk-testing")
     testImplementation("com.google.guava:guava")
     testImplementation("org.slf4j:slf4j-simple")

aws-xray/src/main/java/io/opentelemetry/contrib/awsxray/AwsXrayRemoteSamplerProvider.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package io.opentelemetry.contrib.awsxray;
+
+import com.google.auto.service.AutoService;
+import io.opentelemetry.sdk.autoconfigure.ConfigProperties;
+import io.opentelemetry.sdk.autoconfigure.OpenTelemetrySdkAutoConfiguration;
+import io.opentelemetry.sdk.autoconfigure.spi.ConfigurableSamplerProvider;
+import io.opentelemetry.sdk.trace.samplers.Sampler;
+
+@AutoService(ConfigurableSamplerProvider.class)
+public class AwsXrayRemoteSamplerProvider implements ConfigurableSamplerProvider {
+
+  @Override
+  public Sampler createSampler(ConfigProperties config) {
+    return AwsXrayRemoteSampler.newBuilder(OpenTelemetrySdkAutoConfiguration.getResource()).build();
+  }
+
+  @Override
+  public String getName() {
+    return "xray";
+  }
+}

aws-xray/src/test/java/io/opentelemetry/contrib/awsxray/AwsXrayRemoteSamplerProviderTest.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package io.opentelemetry.contrib.awsxray;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.InstanceOfAssertFactories.type;
+
+import io.opentelemetry.sdk.autoconfigure.spi.ConfigurableSamplerProvider;
+import java.util.ServiceLoader;
+import org.junit.jupiter.api.Test;
+
+class AwsXrayRemoteSamplerProviderTest {
+
+  @Test
+  void serviceProvider() {
+    ServiceLoader<ConfigurableSamplerProvider> samplerProviders =
+        ServiceLoader.load(ConfigurableSamplerProvider.class);
+    assertThat(samplerProviders)
+        .singleElement(type(AwsXrayRemoteSamplerProvider.class))
+        .satisfies(provider -> assertThat(provider.getName()).isEqualTo("xray"));
+  }
+}

dependencyManagement/build.gradle.kts

@@ -23,6 +23,11 @@ val DEPENDENCY_BOMS = listOf(
 )
 
 val DEPENDENCY_SETS = listOf(
+    DependencySet(
+        "com.google.auto.service",
+        "1.0",
+        listOf("auto-service", "auto-service-annotations")
+    ),
     DependencySet(
         "com.google.auto.value",
         "1.8.1",