LazyInitializationBeanFactoryPostProcessor Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/LazyInitializationBeanFactoryPostProcessor.java lines 54–129

public final class LazyInitializationBeanFactoryPostProcessor implements BeanFactoryPostProcessor, Ordered {

	@Override
	public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
		Collection<LazyInitializationExcludeFilter> filters = getFilters(beanFactory);
		for (String beanName : beanFactory.getBeanDefinitionNames()) {
			BeanDefinition beanDefinition = beanFactory.getBeanDefinition(beanName);
			if (beanDefinition instanceof AbstractBeanDefinition abstractBeanDefinition) {
				postProcess(beanFactory, filters, beanName, abstractBeanDefinition);
			}
		}
	}

	private Collection<LazyInitializationExcludeFilter> getFilters(ConfigurableListableBeanFactory beanFactory) {
		// Take care not to force the eager init of factory beans when getting filters
		ArrayList<LazyInitializationExcludeFilter> filters = new ArrayList<>(
				beanFactory.getBeansOfType(LazyInitializationExcludeFilter.class, false, false).values());
		filters.add(LazyInitializationExcludeFilter.forBeanTypes(SmartInitializingSingleton.class));
		filters.add(new InfrastructureRoleLazyInitializationExcludeFilter());
		return filters;
	}

	private void postProcess(ConfigurableListableBeanFactory beanFactory,
			Collection<LazyInitializationExcludeFilter> filters, String beanName,
			AbstractBeanDefinition beanDefinition) {
		Boolean lazyInit = beanDefinition.getLazyInit();
		if (lazyInit != null) {
			return;
		}
		Class<?> beanType = getBeanType(beanFactory, beanName);
		if (!isExcluded(filters, beanName, beanDefinition, beanType)) {
			beanDefinition.setLazyInit(true);
		}
	}

	private @Nullable Class<?> getBeanType(ConfigurableListableBeanFactory beanFactory, String beanName) {
		try {
			return beanFactory.getType(beanName, false);
		}
		catch (NoSuchBeanDefinitionException ex) {
			return null;
		}
	}

	private boolean isExcluded(Collection<LazyInitializationExcludeFilter> filters, String beanName,
			AbstractBeanDefinition beanDefinition, @Nullable Class<?> beanType) {
		if (beanType != null) {
			for (LazyInitializationExcludeFilter filter : filters) {
				if (filter.isExcluded(beanName, beanDefinition, beanType)) {
					return true;
				}
			}
		}
		return false;
	}

	@Override
	public int getOrder() {
		return Ordered.HIGHEST_PRECEDENCE;
	}

	/**
	 * Excludes all {@link BeanDefinition bean definitions} which have the infrastructure
	 * role from lazy initialization.
	 */
	private static final class InfrastructureRoleLazyInitializationExcludeFilter
			implements LazyInitializationExcludeFilter {

		@Override
		public boolean isExcluded(String beanName, BeanDefinition beanDefinition, Class<?> beanType) {
			return beanDefinition.getRole() == BeanDefinition.ROLE_INFRASTRUCTURE;
		}

	}

}