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Exclude SmartInitializingSingletones from lazy initialization
Fixes gh-26470
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@ -16,10 +16,12 @@
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package org.springframework.boot;
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import java.util.ArrayList;
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import java.util.Collection;
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import org.springframework.beans.BeansException;
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import org.springframework.beans.factory.NoSuchBeanDefinitionException;
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import org.springframework.beans.factory.SmartInitializingSingleton;
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import org.springframework.beans.factory.config.BeanDefinition;
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import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
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import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
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@ -30,6 +32,11 @@ import org.springframework.core.Ordered;
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* {@link BeanFactoryPostProcessor} to set lazy-init on bean definitions that are not
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* {@link LazyInitializationExcludeFilter excluded} and have not already had a value
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* explicitly set.
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* <p>
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* Note that {@link SmartInitializingSingleton SmartInitializingSingletons} are
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* automatically excluded from lazy initialization to ensure that their
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* {@link SmartInitializingSingleton#afterSingletonsInstantiated() callback method} is
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* invoked.
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*
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* @author Andy Wilkinson
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* @author Madhura Bhave
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@ -42,9 +49,7 @@ public final class LazyInitializationBeanFactoryPostProcessor implements BeanFac
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@Override
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public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
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// Take care not to force the eager init of factory beans when getting filters
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Collection<LazyInitializationExcludeFilter> filters = beanFactory
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.getBeansOfType(LazyInitializationExcludeFilter.class, false, false).values();
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Collection<LazyInitializationExcludeFilter> filters = getFilters(beanFactory);
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for (String beanName : beanFactory.getBeanDefinitionNames()) {
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BeanDefinition beanDefinition = beanFactory.getBeanDefinition(beanName);
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if (beanDefinition instanceof AbstractBeanDefinition) {
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@ -53,6 +58,14 @@ public final class LazyInitializationBeanFactoryPostProcessor implements BeanFac
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}
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}
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private Collection<LazyInitializationExcludeFilter> getFilters(ConfigurableListableBeanFactory beanFactory) {
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// Take care not to force the eager init of factory beans when getting filters
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ArrayList<LazyInitializationExcludeFilter> filters = new ArrayList<>(
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beanFactory.getBeansOfType(LazyInitializationExcludeFilter.class, false, false).values());
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filters.add(LazyInitializationExcludeFilter.forBeanTypes(SmartInitializingSingleton.class));
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return filters;
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}
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private void postProcess(ConfigurableListableBeanFactory beanFactory,
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Collection<LazyInitializationExcludeFilter> filters, String beanName,
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AbstractBeanDefinition beanDefinition) {
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@ -0,0 +1,90 @@
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/*
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* Copyright 2012-2021 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot;
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import java.util.ArrayList;
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import java.util.List;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.SmartInitializingSingleton;
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import org.springframework.context.annotation.AnnotationConfigApplicationContext;
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import static org.assertj.core.api.Assertions.assertThat;
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/**
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* Tests for {@link LazyInitializationBeanFactoryPostProcessor}.
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*
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* @author Andy Wilkinson
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*/
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class LazyInitializationBeanFactoryPostProcessorTests {
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@Test
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void whenLazyInitializationIsEnabledThenNormalBeansAreNotInitializedUntilRequired() {
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try (AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext()) {
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context.addBeanFactoryPostProcessor(new LazyInitializationBeanFactoryPostProcessor());
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context.register(BeanState.class, ExampleBean.class);
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context.refresh();
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BeanState beanState = context.getBean(BeanState.class);
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assertThat(beanState.initializedBeans).isEmpty();
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context.getBean(ExampleBean.class);
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assertThat(beanState.initializedBeans).containsExactly(ExampleBean.class);
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}
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}
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@Test
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void whenLazyInitializationIsEnabledThenSmartInitializingSingletonsAreInitializedDuringRefresh() {
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try (AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext()) {
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context.addBeanFactoryPostProcessor(new LazyInitializationBeanFactoryPostProcessor());
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context.register(BeanState.class, ExampleSmartInitializingSingleton.class);
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context.refresh();
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BeanState beanState = context.getBean(BeanState.class);
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assertThat(beanState.initializedBeans).containsExactly(ExampleSmartInitializingSingleton.class);
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assertThat(context.getBean(ExampleSmartInitializingSingleton.class).callbackInvoked).isTrue();
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}
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}
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static class ExampleBean {
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ExampleBean(BeanState beanState) {
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beanState.initializedBeans.add(getClass());
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}
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}
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static class ExampleSmartInitializingSingleton implements SmartInitializingSingleton {
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private boolean callbackInvoked;
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ExampleSmartInitializingSingleton(BeanState beanState) {
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beanState.initializedBeans.add(getClass());
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}
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@Override
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public void afterSingletonsInstantiated() {
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this.callbackInvoked = true;
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}
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}
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static class BeanState {
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private final List<Class<?>> initializedBeans = new ArrayList<>();
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}
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}
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