DATACMNS-544 - Indicate repository configuration has been active.

RepositoryConfigurationDelegate now registers the store-specific RepositoryConfigurationExtension as lazy-init BeanDefinition so that other parties can detect that definition.

src/main/java/org/springframework/data/repository/config/RepositoryConfigurationDelegate.java

@@ -15,6 +15,8 @@
  */
 package org.springframework.data.repository.config;
 
+import static org.springframework.beans.factory.support.BeanDefinitionReaderUtils.*;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -25,6 +27,7 @@ import org.springframework.beans.factory.support.AbstractBeanDefinition;
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.beans.factory.support.BeanNameGenerator;
+import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.core.env.Environment;
 import org.springframework.core.env.EnvironmentCapable;
 import org.springframework.core.env.StandardEnvironment;
@@ -104,6 +107,8 @@ public class RepositoryConfigurationDelegate {
 	public List<BeanComponentDefinition> registerRepositoriesIn(BeanDefinitionRegistry registry,
 			RepositoryConfigurationExtension extension) {
 
+		exposeRegistration(extension, registry);
+
 		extension.registerBeansForRoot(registry, configurationSource);
 
 		RepositoryBeanDefinitionBuilder builder = new RepositoryBeanDefinitionBuilder(registry, extension, resourceLoader,
@@ -137,4 +142,31 @@ public class RepositoryConfigurationDelegate {
 
 		return definitions;
 	}
+
+	/**
+	 * Registeres the given {@link RepositoryConfigurationExtension} to indicate the repository configuration for a
+	 * particular store (expressed through the extension's concrete type) has appened. Useful for downstream components
+	 * that need to detect exactly that case. The bean definition is marked as lazy-init so that it doesn't get
+	 * instantiated if no one really cares.
+	 * 
+	 * @param extension
+	 * @param registry
+	 */
+	private void exposeRegistration(RepositoryConfigurationExtension extension, BeanDefinitionRegistry registry) {
+
+		Class<? extends RepositoryConfigurationExtension> extensionType = extension.getClass();
+		String beanName = extensionType.getName().concat(GENERATED_BEAN_NAME_SEPARATOR).concat("0");
+
+		if (registry.containsBeanDefinition(beanName)) {
+			return;
+		}
+
+		// Register extension as bean to indicate repository parsing and registration has happened
+		RootBeanDefinition definition = new RootBeanDefinition(extensionType);
+		definition.setSource(configurationSource.getSource());
+		definition.setRole(AbstractBeanDefinition.ROLE_INFRASTRUCTURE);
+		definition.setLazyInit(true);
+
+		registry.registerBeanDefinition(beanName, definition);
+	}
 }

src/test/java/org/springframework/data/repository/config/RepositoryBeanDefinitionRegistrarSupportIntegrationTests.java

@@ -24,6 +24,7 @@ import org.junit.Test;
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.data.repository.config.RepositoryBeanDefinitionRegistrarSupportUnitTests.DummyConfigurationExtension;
 
 /**
  * Integration tests for {@link RepositoryBeanDefinitionRegistrarSupport}.
@@ -77,4 +78,12 @@ public class RepositoryBeanDefinitionRegistrarSupportIntegrationTests {
 		BeanDefinition definition = context.getBeanDefinition("myRepository");
 		assertThat(definition.getSource(), is(notNullValue()));
 	}
+
+	/**
+	 * @see DATACMNS-544
+	 */
+	@Test
+	public void registersExtensionAsBeanDefinition() {
+		assertThat(context.getBean(DummyConfigurationExtension.class), is(notNullValue()));
+	}
 }

src/test/java/org/springframework/data/repository/config/RepositoryBeanDefinitionRegistrarSupportUnitTests.java

@@ -118,17 +118,19 @@ public class RepositoryBeanDefinitionRegistrarSupportUnitTests {
 		 */
 		@Override
 		protected RepositoryConfigurationExtension getExtension() {
-			return new RepositoryConfigurationExtensionSupport() {
+			return new DummyConfigurationExtension();
+		}
+	}
 
-				public String getRepositoryFactoryClassName() {
+	static class DummyConfigurationExtension extends RepositoryConfigurationExtensionSupport {
-					return RepositoryFactoryBeanSupport.class.getName();
-				}
 
-				@Override
+		public String getRepositoryFactoryClassName() {
-				protected String getModulePrefix() {
+			return RepositoryFactoryBeanSupport.class.getName();
-					return "commons";
+		}
-				}
+
-			};
+		@Override
+		protected String getModulePrefix() {
+			return "commons";
 		}
 	}
 }