【Spring源码解析】BeanFactoryPostProcessor【相关类】源码解析

喜欢ヅ旅行 2023-07-11 05:40 11阅读 0赞

# 1 BeanFactoryPostProcessor作用 #

public interface BeanDefinitionRegistryPostProcessor extends BeanFactoryPostProcessor { 
       /** * 可以修改容器Bean内部的定义信息，全部的bean definitions会加载但是bean没有被实例化 */
       void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException;
    }

## 1.1 代码 ##

(1) Student

@Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class Student { 
    
        private String name;
    
    }

(2) 配置文件

@ComponentScan("com.spring")
    @Configuration
    public class SpringConfig { 
        @Primary
        @Bean
        public Student zhangsan(){ 
            return new Student("张三");
        }
        @Bean
        public Student lisi(){ 
            return new Student("李四");
        }
    }

(3) 主程序

public class SpringApplicationContext { 
        public static void main(String[] args) { 
            AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);
            Student bean = context.getBean(Student.class);
            System.out.println(bean.getName());
        }
    }

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## 1.2 添加配置文件 ##

@Configuration
    public class ZrsBeanFactoryPostProcessor implements BeanFactoryPostProcessor { 
        @Override
        public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { 
            System.out.println("###############postProcessBeanFactory#################");
            System.out.println("bean 的数量为："+beanFactory.getBeanDefinitionCount());
            String[] beanDefinitionNames = beanFactory.getBeanDefinitionNames();
            System.out.println("BeanName为："+ Arrays.asList(beanDefinitionNames));
            //把李四设置成Primary
            BeanDefinition lisi = beanFactory.getBeanDefinition("lisi");
            lisi.setPrimary(true);
            //把张三设置成非Primary
            BeanDefinition zhangsan = beanFactory.getBeanDefinition("zhangsan");
            zhangsan.setPrimary(false);
        }
    }

运行主程序：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 1]

# 2 BeanDefinitionRegistryPostProcessor #

# 2.1 类图 #

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# 2.2 源代码 #

public interface BeanDefinitionRegistryPostProcessor extends BeanFactoryPostProcessor { 
       /** * BeanDefinitionRegistryPostProcessor扩充了BeanFactoryPostProcessor功能 * BeanDefinitionRegistry可以给工厂中注册Bean */
       void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException;
    }

# 2.3 代码 #

(1) 配置文件

@ComponentScan("com.spring")
    @Configuration
    public class SpringConfig { 
    
    }

(2) pojo

@Data
    public class HelloWorld { 
    
    }

(3) ZrsBeanDefinitionRegistryPostProcessor

@Configuration
    public class ZrsBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor { 
        @Override
        public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException { 
            System.out.println("postProcessBeanDefinitionRegistry：");
            System.out.println("bean 的数量为："+registry.getBeanDefinitionCount());
            RootBeanDefinition rootBeanDefinition=new RootBeanDefinition(HelloWorld.class);
            registry.registerBeanDefinition("helloworld", rootBeanDefinition);
        }
        @Override
        public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { 
            System.out.println("postProcessBeanFactory：");
            System.out.println("bean 的数量为："+beanFactory.getBeanDefinitionCount());
        }
    }

(4) 主程序

public class SpringApplicationContext { 
        public static void main(String[] args) { 
            AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);
            HelloWorld bean = context.getBean(HelloWorld.class);
            System.out.println(bean);
        }
    }

(5) 结果  
分析：BeanDefinitionRegistryPostProcessor加强BeanFactoryPostProcessor，并且先运行postProcessBeanDefinitionRegistry，在运行postProcessBeanFactory。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 3]

# 4 源码调试 #

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(1) 分析方法栈  
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(2) IOC初始化调用位置 AbstractApplicationContext.，refresh方法  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 6](3) PostProcessorRegistrationDelegate invokeBeanFactoryPostProcessors 源码分析

public static void invokeBeanFactoryPostProcessors(
          ConfigurableListableBeanFactory beanFactory, List<BeanFactoryPostProcessor> beanFactoryPostProcessors) { 
     
       Set<String> processedBeans = new HashSet<>();
       if (beanFactory instanceof BeanDefinitionRegistry) { 
          BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory;
          //1 存储BeanFactoryPostProcessor，BeanDefinitionRegistryPostProcessor的处理器
          List<BeanFactoryPostProcessor> regularPostProcessors = new LinkedList<>();
          List<BeanDefinitionRegistryPostProcessor> registryProcessors = new LinkedList<>();
          //2 遍历beanFactoryPostProcessors把BeanFactoryPostProcessor、BeanDefinitionRegistryPostProcessor分开
          for (BeanFactoryPostProcessor postProcessor : beanFactoryPostProcessors) { 
             if (postProcessor instanceof BeanDefinitionRegistryPostProcessor) { 
                BeanDefinitionRegistryPostProcessor registryProcessor =
                      (BeanDefinitionRegistryPostProcessor) postProcessor;
                //2.1 执行postProcessBeanDefinitionRegistry，并且添加BeanDefinitionRegistryPostProcessor
                registryProcessor.postProcessBeanDefinitionRegistry(registry);
                registryProcessors.add(registryProcessor);
             }
             else { 
                //2.2 添加BeanFactoryPostProcessor
                regularPostProcessors.add(postProcessor);
             }
          }
          // Do not initialize FactoryBeans here: We need to leave all regular beans
          // uninitialized to let the bean factory post-processors apply to them!
          // Separate between BeanDefinitionRegistryPostProcessors that implement
          // PriorityOrdered, Ordered, and the rest.
          //3 当前的currentRegistryProcessors 
          List<BeanDefinitionRegistryPostProcessor> currentRegistryProcessors = new ArrayList<>();
          // First, invoke the BeanDefinitionRegistryPostProcessors that implement PriorityOrdered.
          //4 获取BeanDefinitionRegistryPostProcessor.class 
          String[] postProcessorNames =
                beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
          //5 找出实现PriorityOrdered接口的BeanDefinitionRegistryPostProcessor 
          for (String ppName : postProcessorNames) { 
             if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) { 
                currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
                processedBeans.add(ppName);
             }
          }
          //6 排序，添加，并且运行当前所有currentRegistryProcessors的postProcessBeanDefinitionRegistry方法，清空currentRegistryProcessors
          sortPostProcessors(currentRegistryProcessors, beanFactory);
          registryProcessors.addAll(currentRegistryProcessors);
          invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
          currentRegistryProcessors.clear();
          // Next, invoke the BeanDefinitionRegistryPostProcessors that implement Ordered.
          //7 重新获取，防止上文postProcessBeanDefinitionRegistry的方法添加了新的BeanDefinitionRegistryPostProcessor
          postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
          //8 分类，获取实现Ordered的接口的BeanDefinitionRegistryPostProcessor
          for (String ppName : postProcessorNames) { 
             if (!processedBeans.contains(ppName) && beanFactory.isTypeMatch(ppName, Ordered.class)) { 
                currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
                processedBeans.add(ppName);
             }
          }
          //9 添加，注册，调取当前BeanDefinitionRegistryPostProcessor所有的postProcessBeanDefinitionRegistry方法，清空currentRegistryProcessors 
          sortPostProcessors(currentRegistryProcessors, beanFactory);
          registryProcessors.addAll(currentRegistryProcessors);
          invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
          currentRegistryProcessors.clear();
          // Finally, invoke all other BeanDefinitionRegistryPostProcessors until no further ones appear.
          //10 处理没有实现Ordered， PriorityOrdered接口的BeanDefinitionRegistryPostProcessor 
          boolean reiterate = true;
          while (reiterate) { 
             reiterate = false;
             //循环获取，防止BeanDefinitionRegistryPostProcessor添加新的BeanDefinitionRegistryPostProcessor对象 
             postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
             for (String ppName : postProcessorNames) { 
                if (!processedBeans.contains(ppName)) { 
                   currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
                   processedBeans.add(ppName);
                   reiterate = true;
                }
             }
             //排序，清空，调用
             sortPostProcessors(currentRegistryProcessors, beanFactory);
             registryProcessors.addAll(currentRegistryProcessors);
             invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
             currentRegistryProcessors.clear();
          }
          // Now, invoke the postProcessBeanFactory callback of all processors handled so far.
          //11 调用所有BeanDefinitionRegistryPostProcessor的postProcessBeanFactory方法和BeanFactoryPostProcessor的postProcessBeanFactory方法
          invokeBeanFactoryPostProcessors(registryProcessors, beanFactory);
          invokeBeanFactoryPostProcessors(regularPostProcessors, beanFactory);
       }
       else { 
          // Invoke factory processors registered with the context instance.
          invokeBeanFactoryPostProcessors(beanFactoryPostProcessors, beanFactory);
       }
       // Do not initialize FactoryBeans here: We need to leave all regular beans
       // uninitialized to let the bean factory post-processors apply to them!
       //12 获取BeanFactoryPostProcessor.class类型beannames 
       String[] postProcessorNames =
             beanFactory.getBeanNamesForType(BeanFactoryPostProcessor.class, true, false);
       // Separate between BeanFactoryPostProcessors that implement PriorityOrdered,
       // Ordered, and the rest.
       //13 存储PriorityOrdered.class、Ordered、双非的类名
       List<BeanFactoryPostProcessor> priorityOrderedPostProcessors = new ArrayList<>();
       List<String> orderedPostProcessorNames = new ArrayList<>();
       List<String> nonOrderedPostProcessorNames = new ArrayList<>();
       //14 分类
       for (String ppName : postProcessorNames) { 
          if (processedBeans.contains(ppName)) { 
             // skip - already processed in first phase above
          }
          else if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) { 
             priorityOrderedPostProcessors.add(beanFactory.getBean(ppName, BeanFactoryPostProcessor.class));
          }
          else if (beanFactory.isTypeMatch(ppName, Ordered.class)) { 
             orderedPostProcessorNames.add(ppName);
          }
          else { 
             nonOrderedPostProcessorNames.add(ppName);
          }
       }
       // First, invoke the BeanFactoryPostProcessors that implement PriorityOrdered.
       //15 排序，调用BeanFactoryPostProcessor的postProcessBeanFactory类
       sortPostProcessors(priorityOrderedPostProcessors, beanFactory);
       invokeBeanFactoryPostProcessors(priorityOrderedPostProcessors, beanFactory);
       // Next, invoke the BeanFactoryPostProcessors that implement Ordered.
       //16 存储，排序，调用BeanFactoryPostProcessor实现了Order的postProcessBeanFactory类
       List<BeanFactoryPostProcessor> orderedPostProcessors = new ArrayList<>();
       for (String postProcessorName : orderedPostProcessorNames) { 
          orderedPostProcessors.add(beanFactory.getBean(postProcessorName, BeanFactoryPostProcessor.class));
       }
       sortPostProcessors(orderedPostProcessors, beanFactory);
       invokeBeanFactoryPostProcessors(orderedPostProcessors, beanFactory);
       // Finally, invoke all other BeanFactoryPostProcessors.
       //17 最后调用双非的BeanFactoryPostProcessor的postProcessBeanFactory方法
       List<BeanFactoryPostProcessor> nonOrderedPostProcessors = new ArrayList<>();
       for (String postProcessorName : nonOrderedPostProcessorNames) { 
          nonOrderedPostProcessors.add(beanFactory.getBean(postProcessorName, BeanFactoryPostProcessor.class));
       }
       invokeBeanFactoryPostProcessors(nonOrderedPostProcessors, beanFactory);
       // Clear cached merged bean definitions since the post-processors might have
       // modified the original metadata, e.g. replacing placeholders in values...
       beanFactory.clearMetadataCache();
    }

# 5 ConfigurationClassPostProcessor #

作用：注册Bean的信息，但不是实例化Bean  
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## 5.1 引入时机 ##

(1) AnnotationConfigApplicationContext 构造  
![在这里插入图片描述][20200304020217797.png]  
(2) AnnotationConfigApplicationContext() 构造  
![在这里插入图片描述][20200304020224291.png]  
(3)AnnotatedBeanDefinitionReader 构造  
![在这里插入图片描述][20200304020232630.png]  
(4) AnnotatedBeanDefinitionReader 构造  
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(5) AnnotationConfigUtils registerAnnotationConfigProcessors  
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(6) AnnotationConfigUtils registerAnnotationConfigProcessors  
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## 5.2 作用 ##

(1) ConfigurationClassPostProcessor 实现了 PriorityOrdered 所以是最先调用

(2) 调试 PostProcessorRegistrationDelegate invokeBeanFactoryPostProcessors  
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(3) PostProcessorRegistrationDelegate invokeBeanDefinitionRegistryPostProcessors  
![在这里插入图片描述][20200304020322690.png]  
(4) ConfigurationClassPostProcessor postProcessBeanDefinitionRegistry  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 12]  
(5) ConfigurationClassPostProcessor processConfigBeanDefinitions  
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(6) ConfigurationClassBeanDefinitionReader loadBeanDefinitions  
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