第五章 spring-connet之AnnotationConfigUtils
阿新 • • 發佈:2019-09-21
前言
AnnotatedBeanDefinitionReader是AnnctionConfig相關上下文與AnnotationConfigUtils的橋樑。還有一個作用是解析class成為BeanDefinitionHolder,註冊到容器裡面。AnnotationConfigUtils是AnnctionConfig相關上下文最核心點,如果弄清楚AnnctionConfig相關上下文,那麼就知道註解讀取相關的機制。
registerAnnotationConfigProcessors方法
registerAnnotationConfigProcessors方法負責向容器裡面註冊相關的類。基本都給予某個體系。靜態方法registerAnnotationConfigProcessors向容器裡面註冊了很多東西了。
- AnnotationAwareOrderComparator註解排序類。對Order註解進行排序
- ContextAnnotationAutowireCandidateResolver 處理Qualifier註解,這個點可能需要深入解讀,spring設計得太複雜了。
- ConfigurationClassPostProcessor 得到componentScan註解計算基本目錄,並掃描對應目錄。處理的註解還有PropertySources,Imports,Bean等等
- AutowiredAnnotationBeanPostProcessor 基於spring bean的監視週期(BeanPostProcessor),掃描Autowired註解
- RequiredAnnotationBeanPostProcessor 基於spring bean的監視週期(BeanPostProcessor),掃描Required註解,這個沒啥用把
- CommonAnnotationBeanPostProcessor 對javax.xml.ws.WebServiceRef註解與javax.ejb.EJB註解的相容,真噁心
- PersistenceAnnotationBeanPostProcessor 對jpa註解的相容
- EventListenerMethodProcessor 當所有bean(除了lazy)完成例項化之後,呼叫。找bean的方法室友有EventListener註解
- DefaultEventListenerFactory 對EventListenerMethodProcessor的支援,目前不知曉有什麼用
public static Set<BeanDefinitionHolder> registerAnnotationConfigProcessors(
BeanDefinitionRegistry registry, Objespringct source) {
DefaultListableBeanFactory beanFactory = unwrapDefaultListableBeanFactory(registry);
if (beanFactory != null) {
if (!(beanFactory.getDependencyComparator() instanceof AnnotationAwareOrderComparator)) {
beanFactory.setDependencyComparator(AnnotationAwareOrderComparator.INSTANCE);
}
if (!(beanFactory.getAutowireCandidateResolver() instanceof ContextAnnotationAutowireCandidateResolver)) {
beanFactory.setAutowireCandidateResolver(new ContextAnnotationAutowireCandidateResolver());
}
}
Set<BeanDefinitionHolder> beanDefs = new LinkedHashSet<BeanDefinitionHolder>(4);
if (!registry.containsBeanDefinition(CONFIGURATION_ANNOTATION_PROCESSOR_BEAN_NAME)) {
RootBeanDefinition def = new RootBeanDefinition(ConfigurationClassPostProcessor.class);
def.setSource(source);
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));
}
if (!registry.containsBeanDefinition(REQUIRED_ANNOTATION_PROCESSOR_BEAN_NAME)) {
RootBeanDefinition def = new RootBeanDefinition(RequiredAnnotationBeanPostProcessor.class);
def.setSource(source);
beanDefs.add(registerPostProcessor(registry, def, REQUIRED_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));
}
// Check for JPA support, and if present add the PersistenceAnnotationBeanPostProcessor.
if (jpaPresent && !registry.containsBeanDefinition(PERSISTENCE_ANNOTATION_PROCESSOR_BEAN_NAME)) {
RootBeanDefinition def = new RootBeanDefinition();
try {
def.setBeanClass(ClassUtils.forName(PERSISTENCE_ANNOTATION_PROCESSOR_CLASS_NAME,
AnnotationConfigUtils.class.getClassLoader()));
}
catch (ClassNotFoundException ex) {
throw new IllegalStateException(
"Cannot load optional framework class: " + PERSISTENCE_ANNOTATION_PROCESSOR_CLASS_NAME, ex);
}
def.setSource(source);
beanDefs.add(registerPostProcessor(registry, def, PERSISTENCE_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;
}
總結
registerAnnotationConfigProcessors方法基本把主動性註解註冊到容器裡面了。如果在把掃面體系搞定,大部分註解都ok了,除了spring-boot的註解體系
processCommonDefinitionAnnotations方法
spring的annatated內容讀取有三種方式反射,位元組碼,還有直接取。processCommonDefinitionAnnotations方法就是直接取spring明確定義的一些註解。這些註解都比較少時間,大家看下就行了。
static void processCommonDefinitionAnnotations(AnnotatedBeanDefinition abd, AnnotatedTypeMetadata metadata) {
if (metadata.isAnnotated(Lazy.class.getName())) {
abd.setLazyInit(attributesFor(metadata, Lazy.class).getBoolean("value"));
}
else if (abd.getMetadata() != metadata && abd.getMetadata().isAnnotated(Lazy.class.getName())) {
abd.setLazyInit(attributesFor(abd.getMetadata(), Lazy.class).getBoolean("value"));
}
if (metadata.isAnnotated(Primary.class.getName())) {
abd.setPrimary(true);
}
if (metadata.isAnnotated(DependsOn.class.getName())) {
abd.setDependsOn(attributesFor(metadata, DependsOn.class).getStringArray("value"));
}
if (abd instanceof AbstractBeanDefinition) {
AbstractBeanDefinition absBd = (AbstractBeanDefinition) abd;
if (metadata.isAnnotated(Role.class.getName())) {
absBd.setRole(attributesFor(metadata, Role.class).getNumber("value").intValue());
}
if (metadata.isAnnotated(Description.class.getName())) {
absBd.setDescription(attributesFor(metadata, Description.class).getString("value"));
}
}
}
隨便說說
本來應該在9月19日完成,19日凌晨失眠,然後取了八卦嶺吃東西。.......