Spring 注册内置后置处理器流程
Spring 面试 About 6,303 words版本
spring-context 5.3.13
注册流程
AnnotationConfigApplicationContext
构造函数中完成了Spring
内置的后置处理器。
public class AnnotationConfigApplicationContext extends GenericApplicationContext implements AnnotationConfigRegistry {
public AnnotationConfigApplicationContext() {
this.reader = new AnnotatedBeanDefinitionReader(this);
}
}
public class AnnotatedBeanDefinitionReader {
public AnnotatedBeanDefinitionReader(BeanDefinitionRegistry registry) {
this(registry, getOrCreateEnvironment(registry));
}
public AnnotatedBeanDefinitionReader(BeanDefinitionRegistry registry, Environment environment) {
AnnotationConfigUtils.registerAnnotationConfigProcessors(this.registry);
}
}
public abstract class AnnotationConfigUtils {
public static void registerAnnotationConfigProcessors(BeanDefinitionRegistry registry) {
registerAnnotationConfigProcessors(registry, null);
}
public static final String CONFIGURATION_ANNOTATION_PROCESSOR_BEAN_NAME =
"org.springframework.context.annotation.internalConfigurationAnnotationProcessor";
public static final String AUTOWIRED_ANNOTATION_PROCESSOR_BEAN_NAME =
"org.springframework.context.annotation.internalAutowiredAnnotationProcessor";
public static final String COMMON_ANNOTATION_PROCESSOR_BEAN_NAME =
"org.springframework.context.annotation.internalCommonAnnotationProcessor";
public static final String EVENT_LISTENER_PROCESSOR_BEAN_NAME =
"org.springframework.context.event.internalEventListenerProcessor";
public static final String EVENT_LISTENER_FACTORY_BEAN_NAME =
"org.springframework.context.event.internalEventListenerFactory";
public static Set<BeanDefinitionHolder> registerAnnotationConfigProcessors(BeanDefinitionRegistry registry, @Nullable Object source) {
DefaultListableBeanFactory beanFactory = unwrapDefaultListableBeanFactory(registry);
Set<BeanDefinitionHolder> beanDefs = new LinkedHashSet<>(8);
if (!registry.containsBeanDefinition(CONFIGURATION_ANNOTATION_PROCESSOR_BEAN_NAME)) {
RootBeanDefinition def = new RootBeanDefinition(ConfigurationClassPostProcessor.class);
def.setSource(source);
// 调用自己的私有方法 registerPostProcessor 注册后置处理器
beanDefs.add(registerPostProcessor(registry, def, CONFIGURATION_ANNOTATION_PROCESSOR_BEAN_NAME));
}
if (!registry.containsBeanDefinition(AUTOWIRED_ANNOTATION_PROCESSOR_BEAN_NAME)) {
RootBeanDefinition def = new RootBeanDefinition(AutowiredAnnotationBeanPostProcessor.class);
def.setSource(source);
beanDefs.add(registerPostProcessor(registry, def, AUTOWIRED_ANNOTATION_PROCESSOR_BEAN_NAME));
}
// Check for JSR-250 support, and if present add the CommonAnnotationBeanPostProcessor.
if (jsr250Present && !registry.containsBeanDefinition(COMMON_ANNOTATION_PROCESSOR_BEAN_NAME)) {
RootBeanDefinition def = new RootBeanDefinition(CommonAnnotationBeanPostProcessor.class);
def.setSource(source);
beanDefs.add(registerPostProcessor(registry, def, COMMON_ANNOTATION_PROCESSOR_BEAN_NAME));
}
if (!registry.containsBeanDefinition(EVENT_LISTENER_PROCESSOR_BEAN_NAME)) {
RootBeanDefinition def = new RootBeanDefinition(EventListenerMethodProcessor.class);
def.setSource(source);
beanDefs.add(registerPostProcessor(registry, def, EVENT_LISTENER_PROCESSOR_BEAN_NAME));
}
if (!registry.containsBeanDefinition(EVENT_LISTENER_FACTORY_BEAN_NAME)) {
RootBeanDefinition def = new RootBeanDefinition(DefaultEventListenerFactory.class);
def.setSource(source);
beanDefs.add(registerPostProcessor(registry, def, EVENT_LISTENER_FACTORY_BEAN_NAME));
}
return beanDefs;
}
private static BeanDefinitionHolder registerPostProcessor(BeanDefinitionRegistry registry, RootBeanDefinition definition, String beanName) {
definition.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
// 调用 GenericApplicationContext 中复写的方法
registry.registerBeanDefinition(beanName, definition);
return new BeanDefinitionHolder(definition, beanName);
}
}
public class GenericApplicationContext extends AbstractApplicationContext implements BeanDefinitionRegistry {
@Override
public void registerBeanDefinition(String beanName, BeanDefinition beanDefinition) throws BeanDefinitionStoreException {
// 调用 DefaultListableBeanFactory 中复写的方法
this.beanFactory.registerBeanDefinition(beanName, beanDefinition);
}
}
public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFactory implements ConfigurableListableBeanFactory, BeanDefinitionRegistry, Serializable {
private final Map<String, BeanDefinition> beanDefinitionMap = new ConcurrentHashMap<>(256);
@Override
public void registerBeanDefinition(String beanName, BeanDefinition beanDefinition) throws BeanDefinitionStoreException {
BeanDefinition existingDefinition = this.beanDefinitionMap.get(beanName);
if (existingDefinition != null) {
// ...
} else {
if (hasBeanCreationStarted()) {
// ...
} else {
// 将 BeanDefinition 信息放入 map 中
this.beanDefinitionMap.put(beanName, beanDefinition);
}
}
}
}
完整调用栈
registerBeanDefinition:1035, DefaultListableBeanFactory (org.springframework.beans.factory.support)
registerBeanDefinition:330, GenericApplicationContext (org.springframework.context.support)
registerPostProcessor:216, AnnotationConfigUtils (org.springframework.context.annotation)
registerAnnotationConfigProcessors:166, AnnotationConfigUtils (org.springframework.context.annotation)
registerAnnotationConfigProcessors:137, AnnotationConfigUtils (org.springframework.context.annotation)
<init>:88, AnnotatedBeanDefinitionReader (org.springframework.context.annotation)
<init>:71, AnnotatedBeanDefinitionReader (org.springframework.context.annotation)
<init>:69, AnnotationConfigApplicationContext (org.springframework.context.annotation)
main:24, Test7 (com.example.learn)
Views: 2,201 · Posted: 2021-12-18
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