sprirng-ioc 图解备注如下

1. BeanFactory接口【ioc容器顶层接口】有如下三个接口直接继承丰富接口功能
   • ListableBeanFactory接口（常用）。
   • AutowireCapableBeanFactory接口。
   • HierarchicalBeanFactory接口。

AutowireCapableBeanFactory：
	Object createBean(Class var1, int var2, boolean var3) throws BeansException;
    Object autowire(Class var1, int var2, boolean var3) throws BeansException;

HierarchicalBeanFactory接口新增getParentBeanFactory方法，具备双亲容器管理功能

资源定位：

1. ResourceLoader接口
   • AbstractApplicationContext抽象类
     • ClassPathXmlApplicationContext实现类
     • FileSystemXmlApplicationContext实现类

IOC初始化-refresh

public void refresh() throws BeansException, IllegalStateException {
        synchronized(this.startupShutdownMonitor) {
            this.prepareRefresh();
            ConfigurableListableBeanFactory beanFactory = this.obtainFreshBeanFactory();
            this.prepareBeanFactory(beanFactory);
            try {
               this.postProcessBeanFactory(beanFactory);
               this.invokeBeanFactoryPostProcessors(beanFactory);
               this.registerBeanPostProcessors(beanFactory);
               this.initMessageSource();
               this.initApplicationEventMulticaster();
               this.onRefresh();
               this.registerListeners();
               this.finishBeanFactoryInitialization(beanFactory);
               this.finishRefresh();
           } catch (BeansException var9) {
               if (this.logger.isWarnEnabled()) {
                   this.logger.warn("Exception encountered during context initialization - cancelling refresh attempt: " + var9);
                }
                this.destroyBeans();
                this.cancelRefresh(var9);
                throw var9;
            } finally {
                this.resetCommonCaches();
            }
        }
    }

载入：

1. BeanDefinition接口
   • AbstractBeanDefinition抽象类
     • AnnotatedGenericBeanDefinition实现类
     • ScannedGenericBeanDefinition实现类

注册：

1. BeanDefinitionRegistry接口
   • DefaultListableBeanFactory实现类

public void registerBeanDefinition(String beanName, BeanDefinition beanDefinition) throws BeanDefinitionStoreException {
        Assert.hasText(beanName, "Bean name must not be empty");
        Assert.notNull(beanDefinition, "BeanDefinition must not be null");
        if (beanDefinition instanceof AbstractBeanDefinition) {
            try {
                ((AbstractBeanDefinition)beanDefinition).validate();
            } catch (BeanDefinitionValidationException var9) {
                throw new BeanDefinitionStoreException(beanDefinition.getResourceDescription(), beanName, "Validation of bean definition failed", var9);
            }
        }

        BeanDefinition existingDefinition = (BeanDefinition)this.beanDefinitionMap.get(beanName);
        if (existingDefinition != null) {
            if (!this.isAllowBeanDefinitionOverriding()) {
                throw new BeanDefinitionOverrideException(beanName, beanDefinition, existingDefinition);
            }

            if (existingDefinition.getRole() < beanDefinition.getRole()) {
                if (this.logger.isInfoEnabled()) {
                    this.logger.info("Overriding user-defined bean definition for bean '" + beanName + "' with a framework-generated bean definition: replacing [" + existingDefinition + "] with [" + beanDefinition + "]");
                }
            } else if (!beanDefinition.equals(existingDefinition)) {
                if (this.logger.isDebugEnabled()) {
                    this.logger.debug("Overriding bean definition for bean '" + beanName + "' with a different definition: replacing [" + existingDefinition + "] with [" + beanDefinition + "]");
                }
            } else if (this.logger.isTraceEnabled()) {
                this.logger.trace("Overriding bean definition for bean '" + beanName + "' with an equivalent definition: replacing [" + existingDefinition + "] with [" + beanDefinition + "]");
            }

            this.beanDefinitionMap.put(beanName, beanDefinition);
        } else {
            if (this.hasBeanCreationStarted()) {
                synchronized(this.beanDefinitionMap) {
                    this.beanDefinitionMap.put(beanName, beanDefinition);
                    List updatedDefinitions = new ArrayList(this.beanDefinitionNames.size() + 1);
                    updatedDefinitions.addAll(this.beanDefinitionNames);
                    updatedDefinitions.add(beanName);
                    this.beanDefinitionNames = updatedDefinitions;
                    if (this.manualSingletonNames.contains(beanName)) {
                        Set updatedSingletons = new LinkedHashSet(this.manualSingletonNames);
                        updatedSingletons.remove(beanName);
                        this.manualSingletonNames = updatedSingletons;
                    }
                }
            } else {
                this.beanDefinitionMap.put(beanName, beanDefinition);
                this.beanDefinitionNames.add(beanName);
                this.manualSingletonNames.remove(beanName);
            }

            this.frozenBeanDefinitionNames = null;
        }