深入挖掘Spring系列 -- 依赖的来源（上）

/*
  * 代码位置：org.springframework.beans.factory.support.BeanDefinitionRegistry
  */
  /**
   * Register a new bean definition with this registry.
   * Must support RootBeanDefinition and ChildBeanDefinition.
   * @param beanName the name of the bean instance to register
   * @param beanDefinition definition of the bean instance to register
   * @throws BeanDefinitionStoreException if the BeanDefinition is invalid
   * @throws BeanDefinitionOverrideException if there is already a BeanDefinition
   * for the specified bean name and we are not allowed to override it
   * @see GenericBeanDefinition
   * @see RootBeanDefinition
   * @see ChildBeanDefinition
   */
  void registerBeanDefinition(String beanName, BeanDefinition beanDefinition)
      throws BeanDefinitionStoreException;
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/**
         * 处理Spring配置对象
         */
        ConfigurationClassPostProcessor configurationClassPostProcessor;
        /**
         * 处理Spring中Bean的一些@Autowired @Value 字段值注入
         */
        AutowiredAnnotationBeanPostProcessor autowiredAnnotationBeanPostProcessor;
        /**
         * 处理一些通用注解，例如说@PostContruct @PreDestroy JSR-250注解 等
         */
        CommonAnnotationBeanPostProcessor commonAnnotationBeanPostProcessor;
        /**
         * 处理标注@EventListener的Spring容器事件监听方法
         */
        EventListenerMethodProcessor eventListenerMethodProcessor;
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AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(); 
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registerAnnotationConfigProcessors:151, AnnotationConfigUtils (org.springframework.context.annotation), AnnotationConfigUtils.java
registerAnnotationConfigProcessors:137, AnnotationConfigUtils (org.springframework.context.annotation), AnnotationConfigUtils.java
<init>:88, AnnotatedBeanDefinitionReader (org.springframework.context.annotation), AnnotatedBeanDefinitionReader.java
<init>:71, AnnotatedBeanDefinitionReader (org.springframework.context.annotation), AnnotatedBeanDefinitionReader.java
<init>:66, AnnotationConfigApplicationContext (org.springframework.context.annotation), AnnotationConfigApplicationContext.java
//这是我自己的测试代码名称
main:31, PersonBeanScopeLookUpDemo (org.idea.spring.bean.aware), PersonBeanScopeLookUpDemo.java
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@Override
  public void refresh() throws BeansException, IllegalStateException {
    synchronized (this.startupShutdownMonitor) {
      /**
        省略其他代码...
       **/
      // 代码段1
      prepareBeanFactory(beanFactory);
      /**
        省略其他代码...
       **/
      try {
       /** 省略其他代码... **/
      }
      catch (BeansException ex) {
        /** 省略其他代码... **/
      }
      finally {
       /** 省略其他代码... **/       
      }
    }
  }
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package org.idea.spring.bean.source;
import org.idea.spring.bean.scope.User;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
/**
 * 单例对象的注册
 *
 * @Author linhao
 * @Date created in 9:56 上午 2021/5/3
 */
public class SingletonBeanRegister {
public static void main(String[] args) {
        AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext();
        annotationConfigApplicationContext.register(SingletonBeanRegister.class);
        DefaultListableBeanFactory defaultListableBeanFactory = (DefaultListableBeanFactory) annotationConfigApplicationContext.getBeanFactory();
if(defaultListableBeanFactory!=null) {
            defaultListableBeanFactory.registerSingleton("singletonUser", new User(1001,"idea"));
        }
        annotationConfigApplicationContext.refresh();
        User user = (User) defaultListableBeanFactory.getSingleton("singletonUser");
        User user2 = (User) defaultListableBeanFactory.getSingleton("singletonUser");
        System.out.println(user == user2);
    }
}
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org.springframework.beans.factory.support.DefaultSingletonBeanRegistry#registerSingleton
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package org.idea.spring.bean.scope;
import org.springframework.beans.factory.InitializingBean;
/**
 * @Author linhao
 * @Date created in 1:47 下午 2021/5/2
 */
public class User implements InitializingBean {
private long time;
private String username;
/** 省略部分代码 **/
@Override
public void afterPropertiesSet() throws Exception {
        System.out.println("==== afterPropertiesSet ====");
    }
}
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package org.idea.spring.bean.source;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import javax.annotation.PostConstruct;
/**
 * @Author linhao
 * @Date created in 11:47 上午 2021/5/3
 */
public class ResolvableDependencySourceDemo  {
    @Autowired
    private String value;
    @PostConstruct
    public void init()  {
        System.out.println(this.value);
    }
    public static void main(String[] args) {
        AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext();
        annotationConfigApplicationContext.register(ResolvableDependencySourceDemo.class);
        annotationConfigApplicationContext.addBeanFactoryPostProcessor(beanFactory -> {
            beanFactory.registerResolvableDependency(String.class,"hello world");
        });
        annotationConfigApplicationContext.refresh();
        String value = annotationConfigApplicationContext.getBean(String.class);
        System.out.println(value);
        annotationConfigApplicationContext.close();
    }
}
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org.springframework.context.support.AbstractApplicationContext#prepareBeanFactory
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