89 lines
2.2 KiB
Markdown
89 lines
2.2 KiB
Markdown
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# 第二章刷新
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synchronized使用当前类中final对象。
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## 获取启动指标StartupStep
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```java
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StartupStep contextRefresh = this.applicationStartup.start("spring.context.refresh");
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```
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## 刷新前预处理prepareRefresh()
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1. 记录启动时间
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2. 设置当前状态未关闭
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3. 设置当前状态活跃
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4. 初始化上下文资源中的占位符，initPropertySources();
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5. 校验上下文可解析，getEnvironment().validateRequiredProperties();
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6. 初始化监听器earlyApplicationListeners（LinkedHashSet）
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7. 初始化事件earlyApplicationEvents（LinkedHashSet）
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## 刷新内部类obtainFreshBeanFactory()
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1. 刷新工厂refreshBeanFactory()
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1. 销毁类
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2. 关闭工厂
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3. 创建新的工厂
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4. 设置工厂customizeBeanFactory序列化类名加对象十六进制，弱引用。
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5. 定制工厂设置是否可重写，是否可循环引用
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6. 加载工厂loadBeanDefinitions，XmlBeanDefinitionReader
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2. 返回工厂getBeanFactory()
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## 装配工厂prepareBeanFactory
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1. 设置加载类
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2. 是否支持spel
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3. 设置Property编辑器
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4. 设置类后置处理器（post processor）BeanPostProcessor，添加感知处理器AwareProcessor
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5. 忽略加载的其他感知接口
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6. 注册解析接口：BeanFactory、ResourceLoader、ApplicationEventPublisher、ApplicationContext
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7. 添加后置处理器ApplicationListenerDetector内部类检测
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8. 图片设置
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9. 加载环境中的配置信息
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## 内部类处理配置postProcessBeanFactory(beanFactory);
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## 设置启动步骤spring.context.beans.post-process
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## 将工厂注册为bean，invokeBeanFactoryPostProcessors(beanFactory)
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## 注册工厂bean，registerBeanPostProcessors(beanFactory)
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## 启动步骤spring.context.beans.post-process完成
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## 初始化message source，initMessageSource()
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## 初始化事件多播器initApplicationEventMulticaster()
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## onRefresh()
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## 注册监听器registerListeners()
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## 初始化剩余信息finishBeanFactoryInitialization(beanFactory)
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## 完成刷新
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1. 清空资源缓存
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2. 初始化生命周期处理器
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3. 启动生命周期
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4. 发布事件
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5. NativeDetector
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## 异常处理
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1. 销毁之前创建的单例
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2. 设置活跃状态为false
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3. 抛出异常
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## finally
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1. 清空缓存
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2. 结束spring.context.refresh
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