refactor: adjust tracer and meter provider customizer execution order (#4129)

* refactor: adjust tracer and meter provider customizer execution order

* refactor: Modify tracer provider customizer flow

* style: Format code using spotlessApply

sdk-extensions/autoconfigure/src/main/java/io/opentelemetry/sdk/autoconfigure/AutoConfiguredOpenTelemetrySdkBuilder.java

@@ -15,6 +15,7 @@ import io.opentelemetry.sdk.OpenTelemetrySdkBuilder;
 import io.opentelemetry.sdk.autoconfigure.spi.AutoConfigurationCustomizer;
 import io.opentelemetry.sdk.autoconfigure.spi.AutoConfigurationCustomizerProvider;
 import io.opentelemetry.sdk.autoconfigure.spi.ConfigProperties;
+import io.opentelemetry.sdk.autoconfigure.spi.traces.SdkTracerProviderConfigurer;
 import io.opentelemetry.sdk.common.CompletableResultCode;
 import io.opentelemetry.sdk.logs.SdkLogEmitterProvider;
 import io.opentelemetry.sdk.metrics.SdkMeterProvider;
@@ -215,6 +216,7 @@ public final class AutoConfiguredOpenTelemetrySdkBuilder implements AutoConfigur
   public AutoConfiguredOpenTelemetrySdk build() {
     if (!customized) {
       customized = true;
+      mergeSdkTracerProviderConfigurer();
       for (AutoConfigurationCustomizerProvider customizer :
           ServiceLoader.load(AutoConfigurationCustomizerProvider.class, serviceClassLoader)) {
         customizer.customize(this);
@@ -223,23 +225,23 @@ public final class AutoConfiguredOpenTelemetrySdkBuilder implements AutoConfigur
 
     SdkTracerProviderBuilder tracerProviderBuilder = SdkTracerProvider.builder();
     ConfigProperties config = getConfig();
-    tracerProviderBuilder = tracerProviderCustomizer.apply(tracerProviderBuilder, config);
 
     Resource resource =
         ResourceConfiguration.configureResource(config, serviceClassLoader, resourceCustomizer);
-    tracerProviderBuilder.setResource(resource);
 
     SdkMeterProvider meterProvider =
         MeterProviderConfiguration.configureMeterProvider(resource, config, serviceClassLoader);
 
-    SdkTracerProvider tracerProvider =
-        TracerProviderConfiguration.configureTracerProvider(
-            tracerProviderBuilder,
-            config,
-            serviceClassLoader,
-            meterProvider,
-            spanExporterCustomizer,
-            samplerCustomizer);
+    tracerProviderBuilder.setResource(resource);
+    TracerProviderConfiguration.configureTracerProvider(
+        tracerProviderBuilder,
+        config,
+        serviceClassLoader,
+        meterProvider,
+        spanExporterCustomizer,
+        samplerCustomizer);
+    tracerProviderBuilder = tracerProviderCustomizer.apply(tracerProviderBuilder, config);
+    SdkTracerProvider tracerProvider = tracerProviderBuilder.build();
 
     SdkLogEmitterProvider logEmitterProvider =
         LogEmitterProviderConfiguration.configureLogEmitterProvider(
@@ -280,6 +282,17 @@ public final class AutoConfiguredOpenTelemetrySdkBuilder implements AutoConfigur
     return AutoConfiguredOpenTelemetrySdk.create(openTelemetrySdk, resource, config);
   }
 
+  private void mergeSdkTracerProviderConfigurer() {
+    for (SdkTracerProviderConfigurer configurer :
+        ServiceLoader.load(SdkTracerProviderConfigurer.class, serviceClassLoader)) {
+      addTracerProviderCustomizer(
+          (builder, config) -> {
+            configurer.configure(builder, config);
+            return builder;
+          });
+    }
+  }
+
   private ConfigProperties getConfig() {
     ConfigProperties config = this.config;
     if (config == null) {

sdk-extensions/autoconfigure/src/main/java/io/opentelemetry/sdk/autoconfigure/TracerProviderConfiguration.java

@@ -9,8 +9,6 @@ import io.opentelemetry.api.metrics.MeterProvider;
 import io.opentelemetry.sdk.autoconfigure.spi.ConfigProperties;
 import io.opentelemetry.sdk.autoconfigure.spi.ConfigurationException;
 import io.opentelemetry.sdk.autoconfigure.spi.traces.ConfigurableSamplerProvider;
-import io.opentelemetry.sdk.autoconfigure.spi.traces.SdkTracerProviderConfigurer;
-import io.opentelemetry.sdk.trace.SdkTracerProvider;
 import io.opentelemetry.sdk.trace.SdkTracerProviderBuilder;
 import io.opentelemetry.sdk.trace.SpanLimits;
 import io.opentelemetry.sdk.trace.SpanLimitsBuilder;
@@ -26,12 +24,11 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.ServiceLoader;
 import java.util.function.BiFunction;
 
 final class TracerProviderConfiguration {
 
-  static SdkTracerProvider configureTracerProvider(
+  static void configureTracerProvider(
       SdkTracerProviderBuilder tracerProviderBuilder,
       ConfigProperties config,
       ClassLoader serviceClassLoader,
@@ -49,21 +46,12 @@ final class TracerProviderConfiguration {
     tracerProviderBuilder.setSampler(
         samplerCustomizer.apply(configureSampler(sampler, config, serviceClassLoader), config));
 
-    // Run user configuration before setting exporters from environment to allow user span
-    // processors to effect export.
-    for (SdkTracerProviderConfigurer configurer :
-        ServiceLoader.load(SdkTracerProviderConfigurer.class, serviceClassLoader)) {
-      configurer.configure(tracerProviderBuilder, config);
-    }
-
     Map<String, SpanExporter> exportersByName =
         SpanExporterConfiguration.configureSpanExporters(
             config, serviceClassLoader, meterProvider, spanExporterCustomizer);
 
     configureSpanProcessors(config, exportersByName, meterProvider)
         .forEach(tracerProviderBuilder::addSpanProcessor);
-
-    return tracerProviderBuilder.build();
   }
 
   static List<SpanProcessor> configureSpanProcessors(

sdk-extensions/autoconfigure/src/test/java/io/opentelemetry/sdk/autoconfigure/AutoConfiguredOpenTelemetrySdkTest.java

@@ -23,12 +23,16 @@ import io.opentelemetry.context.propagation.TextMapPropagator;
 import io.opentelemetry.sdk.OpenTelemetrySdk;
 import io.opentelemetry.sdk.common.CompletableResultCode;
 import io.opentelemetry.sdk.resources.Resource;
+import io.opentelemetry.sdk.testing.exporter.InMemorySpanExporter;
 import io.opentelemetry.sdk.trace.IdGenerator;
+import io.opentelemetry.sdk.trace.data.SpanData;
+import io.opentelemetry.sdk.trace.export.SimpleSpanProcessor;
 import io.opentelemetry.sdk.trace.export.SpanExporter;
 import io.opentelemetry.sdk.trace.samplers.Sampler;
 import io.opentelemetry.sdk.trace.samplers.SamplingResult;
 import io.opentelemetry.semconv.resource.attributes.ResourceAttributes;
 import java.util.Collections;
+import java.util.List;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
 import org.junit.jupiter.api.BeforeEach;
@@ -150,4 +154,37 @@ class AutoConfiguredOpenTelemetrySdkTest {
     // Ensures the export happened.
     sdk.getSdkTracerProvider().shutdown().join(10, TimeUnit.SECONDS);
   }
+
+  @Test
+  void tracerProviderCustomizer() {
+    InMemorySpanExporter spanExporter = InMemorySpanExporter.create();
+    AutoConfiguredOpenTelemetrySdkBuilder autoConfiguration =
+        AutoConfiguredOpenTelemetrySdk.builder()
+            .addTracerProviderCustomizer(
+                (tracerProviderBuilder, config) -> {
+                  tracerProviderBuilder.setResource(Resource.builder().put("cat", "meow").build());
+                  return tracerProviderBuilder.addSpanProcessor(
+                      SimpleSpanProcessor.create(spanExporter));
+                })
+            .addResourceCustomizer(
+                (resource, config) -> resource.merge(Resource.builder().put("cow", "moo").build()))
+            .addPropertiesSupplier(() -> Collections.singletonMap("otel.metrics.exporter", "none"))
+            .addPropertiesSupplier(() -> Collections.singletonMap("otel.traces.exporter", "none"))
+            .addPropertiesSupplier(() -> Collections.singletonMap("otel.logs.exporter", "none"))
+            .setResultAsGlobal(false);
+
+    GlobalOpenTelemetry.set(OpenTelemetry.noop());
+    AutoConfiguredOpenTelemetrySdk autoConfigured = autoConfiguration.build();
+    assertThat(autoConfigured.getResource().getAttribute(stringKey("cow"))).isEqualTo("moo");
+
+    OpenTelemetrySdk sdk = autoConfigured.getOpenTelemetrySdk();
+    sdk.getTracerProvider().get("test").spanBuilder("test").startSpan().end();
+    List<SpanData> spanItems = spanExporter.getFinishedSpanItems();
+    assertThat(spanItems.size()).isEqualTo(1);
+    SpanData spanData = spanItems.get(0);
+    assertThat(spanData.getResource().getAttribute(stringKey("cat"))).isEqualTo("meow");
+
+    // Ensures the export happened.
+    sdk.getSdkTracerProvider().shutdown().join(10, TimeUnit.SECONDS);
+  }
 }

sdk-extensions/autoconfigure/src/test/java/io/opentelemetry/sdk/autoconfigure/TracerProviderConfigurationTest.java

@@ -16,6 +16,7 @@ import io.opentelemetry.sdk.autoconfigure.spi.ConfigurationException;
 import io.opentelemetry.sdk.common.CompletableResultCode;
 import io.opentelemetry.sdk.resources.Resource;
 import io.opentelemetry.sdk.trace.SdkTracerProvider;
+import io.opentelemetry.sdk.trace.SdkTracerProviderBuilder;
 import io.opentelemetry.sdk.trace.SpanLimits;
 import io.opentelemetry.sdk.trace.SpanProcessor;
 import io.opentelemetry.sdk.trace.export.BatchSpanProcessor;
@@ -61,14 +62,16 @@ class TracerProviderConfigurationTest {
     Resource resource = Resource.create(Attributes.builder().put("cat", "meow").build());
     // We don't have any exporters on classpath for this test so check no-op case. Exporter cases
     // are verified in other test sets like testFullConfig.
-    SdkTracerProvider tracerProvider =
-        TracerProviderConfiguration.configureTracerProvider(
-            SdkTracerProvider.builder().setResource(resource),
-            DefaultConfigProperties.createForTest(properties),
-            TracerProviderConfiguration.class.getClassLoader(),
-            MeterProvider.noop(),
-            (a, unused) -> a,
-            (a, unused) -> a);
+    SdkTracerProviderBuilder tracerProviderBuilder =
+        SdkTracerProvider.builder().setResource(resource);
+    TracerProviderConfiguration.configureTracerProvider(
+        tracerProviderBuilder,
+        DefaultConfigProperties.createForTest(properties),
+        TracerProviderConfiguration.class.getClassLoader(),
+        MeterProvider.noop(),
+        (a, unused) -> a,
+        (a, unused) -> a);
+    SdkTracerProvider tracerProvider = tracerProviderBuilder.build();
     try {
       assertThat(tracerProvider.getSampler()).isEqualTo(Sampler.alwaysOff());