Exclude bean definition from AOT processing using an attribute

This commits allows a particular bean definition to be excluded from
AOT processing using an attribute.

If BeanRegistrationAotProcessor#IGNORE_REGISTRATION_ATTRIBUTE is set
to `true`, then the bean definition is excluded. This complement the
existing BeanRegistrationExcludeFilter capability.

Closes spring-projectsgh-33243

spring-beans/src/main/java/org/springframework/beans/factory/aot/BeanDefinitionMethodGeneratorFactory.java

@@ -133,6 +133,10 @@ private boolean isExcluded(RegisteredBean registeredBean) {
 	}
 
 	private boolean isImplicitlyExcluded(RegisteredBean registeredBean) {
+		if (Boolean.TRUE.equals(registeredBean.getMergedBeanDefinition()
+				.getAttribute(BeanRegistrationAotProcessor.IGNORE_REGISTRATION_ATTRIBUTE))) {
+			return true;
+		}
 		Class<?> beanClass = registeredBean.getBeanClass();
 		if (BeanFactoryInitializationAotProcessor.class.isAssignableFrom(beanClass)) {
 			return true;

spring-beans/src/main/java/org/springframework/beans/factory/aot/BeanRegistrationAotProcessor.java

@@ -49,6 +49,15 @@
 @FunctionalInterface
 public interface BeanRegistrationAotProcessor {
 
+	/**
+	 * The name of an attribute that can be
+	 * {@link org.springframework.core.AttributeAccessor#setAttribute set} on a
+	 * {@link org.springframework.beans.factory.config.BeanDefinition} to signal
+	 * that its registration should not be processed.
+	 * @since 6.2
+	 */
+	String IGNORE_REGISTRATION_ATTRIBUTE = "aotProcessingIgnoreRegistration";
+
 	/**
 	 * Process the given {@link RegisteredBean} instance ahead-of-time and
 	 * return a contribution or {@code null}.

spring-beans/src/test/java/org/springframework/beans/factory/aot/BeanDefinitionMethodGeneratorFactoryTests.java

@@ -36,6 +36,7 @@
  * Tests for {@link BeanDefinitionMethodGeneratorFactory}.
  *
  * @author Phillip Webb
+ * @author Stephane Nicoll
  */
 class BeanDefinitionMethodGeneratorFactoryTests {
 
@@ -58,6 +59,40 @@ void createWhenBeanRegistrationExcludeFilterFactoryIsNotAotProcessorLoads() {
 				AotServices.factories(loader)));
 	}
 
+	@Test
+	void getBeanDefinitionMethodGeneratorWhenExcludedByBeanDefinitionAttributeReturnsNull() {
+		MockSpringFactoriesLoader springFactoriesLoader = new MockSpringFactoriesLoader();
+		DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
+		RegisteredBean registeredBean = registerTestBean(beanFactory);
+		registeredBean.getMergedBeanDefinition().setAttribute(
+				BeanRegistrationAotProcessor.IGNORE_REGISTRATION_ATTRIBUTE, true);
+		BeanDefinitionMethodGeneratorFactory methodGeneratorFactory = new BeanDefinitionMethodGeneratorFactory(
+				AotServices.factoriesAndBeans(springFactoriesLoader, beanFactory));
+		assertThat(methodGeneratorFactory.getBeanDefinitionMethodGenerator(registeredBean)).isNull();
+	}
+
+	@Test
+	void getBeanDefinitionMethodGeneratorWhenBeanDefinitionAttributeSetToFalseDoesNotFilterBean() {
+		MockSpringFactoriesLoader springFactoriesLoader = new MockSpringFactoriesLoader();
+		DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
+		RegisteredBean registeredBean = registerTestBean(beanFactory);
+		registeredBean.getMergedBeanDefinition().setAttribute(
+				BeanRegistrationAotProcessor.IGNORE_REGISTRATION_ATTRIBUTE, false);
+		BeanDefinitionMethodGeneratorFactory methodGeneratorFactory = new BeanDefinitionMethodGeneratorFactory(
+				AotServices.factoriesAndBeans(springFactoriesLoader, beanFactory));
+		assertThat(methodGeneratorFactory.getBeanDefinitionMethodGenerator(registeredBean)).isNotNull();
+	}
+
+	@Test
+	void getBeanDefinitionMethodGeneratorWhenBeanDefinitionAttributeIsNotSetDoesNotFilterBean() {
+		MockSpringFactoriesLoader springFactoriesLoader = new MockSpringFactoriesLoader();
+		DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
+		RegisteredBean registeredBean = registerTestBean(beanFactory);
+		BeanDefinitionMethodGeneratorFactory methodGeneratorFactory = new BeanDefinitionMethodGeneratorFactory(
+				AotServices.factoriesAndBeans(springFactoriesLoader, beanFactory));
+		assertThat(methodGeneratorFactory.getBeanDefinitionMethodGenerator(registeredBean)).isNotNull();
+	}
+
 	@Test
 	void getBeanDefinitionMethodGeneratorWhenExcludedByBeanRegistrationExcludeFilterReturnsNull() {
 		MockSpringFactoriesLoader springFactoriesLoader = new MockSpringFactoriesLoader();