CachingMetadataReaderFactoryPostProcessor Class — spring-boot Architecture

Source Code

core/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/SharedMetadataReaderFactoryContextInitializer.java lines 87–153

	static class CachingMetadataReaderFactoryPostProcessor
			implements BeanDefinitionRegistryPostProcessor, PriorityOrdered {

		private final ConfigurableApplicationContext context;

		CachingMetadataReaderFactoryPostProcessor(ConfigurableApplicationContext context) {
			this.context = context;
		}

		@Override
		public int getOrder() {
			// Must happen before the ConfigurationClassPostProcessor is created
			return Ordered.HIGHEST_PRECEDENCE;
		}

		@Override
		public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
		}

		@Override
		public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
			register(registry);
			configureConfigurationClassPostProcessor(registry);
		}

		private void register(BeanDefinitionRegistry registry) {
			if (!registry.containsBeanDefinition(BEAN_NAME)) {
				BeanDefinition definition = BeanDefinitionBuilder
					.rootBeanDefinition(SharedMetadataReaderFactoryBean.class, SharedMetadataReaderFactoryBean::new)
					.getBeanDefinition();
				registry.registerBeanDefinition(BEAN_NAME, definition);
			}
		}

		private void configureConfigurationClassPostProcessor(BeanDefinitionRegistry registry) {
			try {
				configureConfigurationClassPostProcessor(
						registry.getBeanDefinition(AnnotationConfigUtils.CONFIGURATION_ANNOTATION_PROCESSOR_BEAN_NAME));
			}
			catch (NoSuchBeanDefinitionException ex) {
				// Ignore
			}
		}

		private void configureConfigurationClassPostProcessor(BeanDefinition definition) {
			if (definition instanceof AbstractBeanDefinition abstractBeanDefinition) {
				configureConfigurationClassPostProcessor(abstractBeanDefinition);
				return;
			}
			configureConfigurationClassPostProcessor(definition.getPropertyValues());
		}

		private void configureConfigurationClassPostProcessor(AbstractBeanDefinition definition) {
			Supplier<?> instanceSupplier = definition.getInstanceSupplier();
			if (instanceSupplier != null) {
				definition.setInstanceSupplier(
						new ConfigurationClassPostProcessorCustomizingSupplier(this.context, instanceSupplier));
				return;
			}
			configureConfigurationClassPostProcessor(definition.getPropertyValues());
		}

		private void configureConfigurationClassPostProcessor(MutablePropertyValues propertyValues) {
			propertyValues.add("metadataReaderFactory", new RuntimeBeanReference(BEAN_NAME));
		}

	}