Allow autowiring of `DateTimeProvider` for `AuditingHandler`.

Use autowired properties for AuditorAware and DateTimeProvider when explicit references are not provided

Closes: #3177
Original pull request: #3385

Signed-off-by: JaeYeon Kim <ghgh415263@naver.com>

src/main/java/org/springframework/data/auditing/config/AuditingBeanDefinitionRegistrarSupport.java

@@ -21,7 +21,6 @@ import java.lang.annotation.Annotation;
 
 import org.springframework.aop.framework.ProxyFactoryBean;
 import org.springframework.aop.target.LazyInitTargetSource;
-import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.beans.factory.support.AbstractBeanDefinition;
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
@@ -29,7 +28,6 @@ import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
 import org.springframework.core.type.AnnotationMetadata;
 import org.springframework.data.auditing.AuditingHandler;
-import org.springframework.data.auditing.CurrentDateTimeProvider;
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 
@@ -42,6 +40,7 @@ import org.springframework.util.StringUtils;
  * @author Thomas Darimont
  * @author Oliver Gierke
  * @author Francisco Soler
+ * @author Jaeyeon Kim
  */
 public abstract class AuditingBeanDefinitionRegistrarSupport implements ImportBeanDefinitionRegistrar {
 
@@ -117,11 +116,11 @@ public abstract class AuditingBeanDefinitionRegistrarSupport implements ImportBe
 	protected BeanDefinitionBuilder configureDefaultAuditHandlerAttributes(AuditingConfiguration configuration,
 			BeanDefinitionBuilder builder) {
 
+		builder.setAutowireMode(AbstractBeanDefinition.AUTOWIRE_BY_TYPE);
+
 		if (StringUtils.hasText(configuration.getAuditorAwareRef())) {
 			builder.addPropertyValue(AUDITOR_AWARE,
 					createLazyInitTargetSourceBeanDefinition(configuration.getAuditorAwareRef()));
-		} else {
-			builder.setAutowireMode(AutowireCapableBeanFactory.AUTOWIRE_BY_TYPE);
 		}
 
 		builder.addPropertyValue(SET_DATES, configuration.isSetDates());
@@ -129,8 +128,6 @@ public abstract class AuditingBeanDefinitionRegistrarSupport implements ImportBe
 
 		if (StringUtils.hasText(configuration.getDateTimeProviderRef())) {
 			builder.addPropertyReference(DATE_TIME_PROVIDER, configuration.getDateTimeProviderRef());
-		} else {
-			builder.addPropertyValue(DATE_TIME_PROVIDER, CurrentDateTimeProvider.INSTANCE);
 		}
 
 		builder.setRole(AbstractBeanDefinition.ROLE_INFRASTRUCTURE);

src/test/java/org/springframework/data/auditing/config/AuditingBeanDefinitionRegistrarSupportUnitTests.java

@@ -27,8 +27,11 @@ import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
 
 import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.support.AbstractBeanDefinition;
+import org.springframework.beans.factory.support.BeanDefinitionBuilder;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.core.type.AnnotationMetadata;
+import org.springframework.data.auditing.AuditingHandler;
 import org.springframework.data.auditing.EnableAuditing;
 
 /**
@@ -38,6 +41,7 @@ import org.springframework.data.auditing.EnableAuditing;
  * @author Thomas Darimont
  * @author Oliver Gierke
  * @author Francisco Soler
+ * @author Jaeyeon Kim
  */
 @ExtendWith(MockitoExtension.class)
 class AuditingBeanDefinitionRegistrarSupportUnitTests {
@@ -73,6 +77,76 @@ class AuditingBeanDefinitionRegistrarSupportUnitTests {
 				.isThrownBy(() -> registrar.registerBeanDefinitions(metadata, null));
 	}
 
+	@Test // DATACMNS-3177
+	void setsAuditorAwareAndDateTimeProviderIfConfigured() {
+
+		AuditingConfiguration configuration = new AuditingConfiguration() {
+			@Override
+			public String getAuditorAwareRef() {
+				return "auditorAwareBean";
+			}
+
+			@Override
+			public boolean isSetDates() {
+				return true;
+			}
+
+			@Override
+			public String getDateTimeProviderRef() {
+				return "dateTimeProviderBean";
+			}
+
+			@Override
+			public boolean isModifyOnCreate() {
+				return true;
+			}
+		};
+
+		BeanDefinitionBuilder builder = BeanDefinitionBuilder.rootBeanDefinition(AuditingHandler.class);
+		DummyAuditingBeanDefinitionRegistrarSupport registrar = new DummyAuditingBeanDefinitionRegistrarSupport();
+
+		BeanDefinitionBuilder result = registrar.configureDefaultAuditHandlerAttributes(configuration, builder);
+		AbstractBeanDefinition beanDefinition = result.getBeanDefinition();
+
+		assertThat(beanDefinition.getAutowireMode()).isEqualTo(AbstractBeanDefinition.AUTOWIRE_BY_TYPE);
+		assertThat(beanDefinition.getPropertyValues().contains("auditorAware")).isTrue();
+		assertThat(beanDefinition.getPropertyValues().contains("dateTimeProvider")).isTrue();
+	}
+
+	@Test // DATACMNS-3177
+	void doesNotSetAuditorAwareAndDateTimeProviderIfNotConfigured() {
+
+		AuditingConfiguration configuration = new AuditingConfiguration() {
+			@Override
+			public String getAuditorAwareRef() {
+				return "";
+			}
+
+			@Override
+			public boolean isSetDates() {
+				return true;
+			}
+
+			@Override
+			public String getDateTimeProviderRef() {
+				return "";
+			}
+
+			@Override
+			public boolean isModifyOnCreate() { return true; }
+		};
+
+		BeanDefinitionBuilder builder = BeanDefinitionBuilder.rootBeanDefinition(AuditingHandler.class);
+		DummyAuditingBeanDefinitionRegistrarSupport registrar = new DummyAuditingBeanDefinitionRegistrarSupport();
+
+		BeanDefinitionBuilder result = registrar.configureDefaultAuditHandlerAttributes(configuration, builder);
+		AbstractBeanDefinition beanDefinition = result.getBeanDefinition();
+
+		assertThat(beanDefinition.getAutowireMode()).isEqualTo(AbstractBeanDefinition.AUTOWIRE_BY_TYPE);
+		assertThat(beanDefinition.getPropertyValues().contains("auditorAware")).isFalse();
+		assertThat(beanDefinition.getPropertyValues().contains("dateTimeProvider")).isFalse();
+	}
+
 	static class SampleConfig {}
 
 	static class DummyAuditingBeanDefinitionRegistrarSupport extends AuditingBeanDefinitionRegistrarSupport {