简栈文化

求 -15|3

[-15]原码 = 10001111
[-15]反码 = 11110000 //原码求反码符号位不变
[-15]补码 = 11110001 //反码+1等于补码

[3]原码 = 00000011
[3]反码 = 00000011 //正数都一致
[3]补码 = 00000011 //正数都一致

-15|3 = 11110011 //两个补码进行或操作

[结果]补码 = 11110011 //上面求得的值
[结果]反码 = 10001100 //符号位不变
[结果]原码 = 10001101 //反码+1

100001101 转化为十进制就是-13。

@sophist 其实这个是基础知识，我们在计算机的存储里面short：16位，最大数据存储量是65536，数据范围是-32768~32767之间。

0xee 0xb9 → -4423

16进制对应二进制：11101110 10111001

high << 8 | low & 255 低位保持不变

11101110 00000000
或
00000000 10111001
------------------
1110111010111001 第一位代表符号位，这个数字肯定是负数

取不骂 + 1
1001000101000110 + 1 = 1001000101000111 = -4423

package org.springframework.boot.context.properties;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import org.springframework.core.annotation.AliasFor;

@Target({ ElementType.TYPE, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ConfigurationProperties {
  ......
}

@ConfigurationProperties(prefix = "custom.config.config1")
public class Config1Properties{
	private List<String> folders;
	...
}

@ConfigurationProperties(prefix = "custom.config.config1")
public class Config1Properties{
	private Map<String, String> map;
	...
}

@ConfigurationProperties(prefix = "custom.config.config1")
public class Config1Properties{
	private ServerProperties server;
	...
	public static class ServerProperties {
		private String host;
		private int port;
		private String username;
		private String password;
		...
	}
}

@ConfigurationProperties(prefix = "custom.config.config1")
public class Config1Properties{
	private List<ServerProperties> servers;
	...
	public static class ServerProperties {
		private String host;
		private int port;
		private String username;
		private String password;
		...
	}
}

@Data
@EqualsAndHashCode(callSuper = false)
@ConfigurationProperties(prefix = OssConstants.MULTI_CONFIG_PREFIX)
public class MultiOssProperties {
	private Map<String, OssProperties> clients;

	@Data
	public static class OssProperties {
		private String accessKeyId;
		private String accessKeySecret;
		private String publicEndpoint;
		private String privateEndpoint;
		private String bucketName;
		private String object;
	}

public class MultiOssScannerConfigurer implements BeanDefinitionRegistryPostProcessor, InitializingBean, ApplicationContextAware, BeanNameAware {

	private ApplicationContext applicationContext;

	@Setter
	private MultiOssProperties multiOssProperties;

	@Override
	public void setBeanName(String name) {
		log.info("init bean {}", name);
	}

	@Override
	public void afterPropertiesSet() throws Exception {
		Objects.requireNonNull(this.multiOssProperties, "multiOssProperties不能为空");
		Objects.requireNonNull(this.applicationContext, "applicationContext不能为空");
	}

  // 动态的定义Bean
	@Override
	public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry beanDefinitionRegistry) throws BeansException {
		String beanSuffixName = StringUtils.capitalize(OssConstants.BEAN_SUFFIX_NAME);
    // productCodes实际与oss.multi.clients.xdtrans的xdtrans保持一致
		multiOssProperties.getClients().forEach((productCode, ossProperties) -> {
			AbstractBeanDefinition beanDefinition = BeanDefinitionBuilder.genericBeanDefinition(OssClient.class,
					() -> OssClientUtils.buildOssClient(ossProperties))
					.getRawBeanDefinition();
			beanDefinition.setInitMethodName("init");
			beanDefinition.setDestroyMethodName("shutDown");
			beanDefinitionRegistry.registerBeanDefinition(productCode + beanSuffixName, beanDefinition);
		});
	}

	@Override
	public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {
	}

	@Override
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		this.applicationContext = applicationContext;
	}

}

@Configuration
@EnableConfigurationProperties(MultiOssProperties.class)
@ConditionalOnProperty(prefix = OssConstants.MULTI_CONFIG_PREFIX, value = "enabled")
public class MultiOssAutoConfiguration {

	/**
	 * 初始化多个 ossClient 自动配置
	 *
	 * @param environment 环境变量属性
	 * @return OssClient 自动扫描注册器
	 */
	@Bean
	public MultiOssScannerConfigurer multiOssScannerConfigurer(Environment environment) {
		Binder binder = Binder.get(environment);
		MultiOssProperties properties = binder.bind(OssConstants.MULTI_CONFIG_PREFIX, MultiOssProperties.class).get();
		MultiOssScannerConfigurer multiOssScannerConfigurer = new MultiOssScannerConfigurer();
		multiOssScannerConfigurer.setMultiOssProperties(properties);
		return multiOssScannerConfigurer;
	}
}

@Getter
@AllArgsConstructor
public enum OssTypeEnum {
		// 注意一下这里的beanName,要跟上面的postProcessBeanDefinitionRegistry保持一致
    XDtransOssClient("xdtransOssClient", "oss1"),
    DianDianOssClient("ddacctOssClient", "oss2"),
    ;

    private final String beanName;
    private final String desc;

    // 根据BeanName来Spring容器中获取即可
    public OssClient getBean() {
        return SpringContextHolder.getBean(beanName, OssClient.class);
    }

protected final <T> T bind(ConfigurationPropertyName name, Bindable<T> target, BindHandler handler, Context context, boolean allowRecursiveBinding) {
		context.clearConfigurationProperty();
		try {
			target = handler.onStart(name, target, context);
			if (target == null) {
				return null;
			}
			Object bound = bindObject(name, target, handler, context,allowRecursiveBinding);
			return handleBindResult(name, target, handler, context, bound);
		} catch (Exception ex) {
			return handleBindError(name, target, handler, context, ex);
		}
}

private Object bindBean(ConfigurationPropertyName name, Bindable<?> target,
		BindHandler handler, Context context, boolean allowRecursiveBinding) {
	if (containsNoDescendantOf(context.getSources(), name)
			|| isUnbindableBean(name, target, context)) {
		return null;
	}
	BeanPropertyBinder propertyBinder = (propertyName, propertyTarget) -> bind(
			name.append(propertyName), propertyTarget, handler, context, false);
	Class<?> type = target.getType().resolve(Object.class);
	if (!allowRecursiveBinding && context.hasBoundBean(type)) {
		return null;
	}
	return context.withBean(type, () -> {
		Stream<?> boundBeans = BEAN_BINDERS.stream()
				.map((b) -> b.bind(name, target, context, propertyBinder));
		return boundBeans.filter(Objects::nonNull).findFirst().orElse(null);
	});
}

private static final List<BeanBinder> BEAN_BINDERS;

static {
	List<BeanBinder> binders = new ArrayList<>();
	binders.add(new JavaBeanBinder());
	BEAN_BINDERS = Collections.unmodifiableList(binders);
}

public <T> T bind(ConfigurationPropertyName name, Bindable<T> target, Context context,
		BeanPropertyBinder propertyBinder) {
	boolean hasKnownBindableProperties = hasKnownBindableProperties(name, context);
	Bean<T> bean = Bean.get(target, hasKnownBindableProperties);
	if (bean == null) {
		return null;
	}
	BeanSupplier<T> beanSupplier = bean.getSupplier(target);
	boolean bound = bind(propertyBinder, bean, beanSupplier);
	return (bound ? beanSupplier.get() : null);
}
// 返回对应的对象
public BeanSupplier<T> getSupplier(Bindable<T> target) {
	return new BeanSupplier<>(() -> {
		T instance = null;
		if (target.getValue() != null) {
			instance = target.getValue().get();
		}
		if (instance == null) {
			instance = (T) BeanUtils.instantiateClass(this.resolvedType);
		}
		return instance;
	});
}

public class StringBuilderDemo {

    public static void main(String[] args) throws InterruptedException {
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < 10; i++){
            new Thread(new Runnable( {
                @Override
                public void run() {
                    for (int j = 0; j < 1000; j++){
                        stringBuilder.append("a");
                    }
                }
            }).start();
        }

        Thread.sleep(100);
        System.out.println(stringBuilder.length());
    }

}

//存储字符串的具体内容
char[] value;
//已经使用的字符数组的数量
int count;

@Override
public StringBuilder append(String str) {
    super.append(str);
    return this;
}

public AbstractStringBuilder append(String str) {
    if (str == null)
        return appendNull();
    int len = str.length();
    ensureCapacityInternal(count + len);
    str.getChars(0, len, value, count);
    count += len;
    return this;
}

private void ensureCapacityInternal(int minimumCapacity) {
        // overflow-conscious code
    if (minimumCapacity - value.length > 0)
        expandCapacity(minimumCapacity);
}

void expandCapacity(int minimumCapacity) {
    //计算新的容量
    int newCapacity = value.length * 2 + 2;
    //中间省略了一些检查逻辑
    ...
    value = Arrays.copyOf(value, newCapacity);
}

public static char[] copyOf(char[] original, int newLength) {
    char[] copy = new char[newLength];
    //拷贝数组
    System.arraycopy(original, 0, copy, 0,
                         Math.min(original.length, newLength));
    return copy;
}

str.getChars(0, len, value, count);

public void getChars(int srcBegin, int srcEnd, char dst[], int dstBegin) {
    //中间省略了一些检查
    ...   
    System.arraycopy(value, srcBegin, dst, dstBegin, srcEnd - srcBegin);
    }

@Override
public synchronized StringBuffer append(String str) {
    toStringCache = null;
    super.append(str);
    return this;
}

// 想根据配置文件来动态的生成我们的Bean对象
public class MultiOssScannerConfigurer implements BeanDefinitionRegistryPostProcessor, InitializingBean, ApplicationContextAware, BeanNameAware {
	@Setter
	private MultiOssProperties multiOssProperties;

	@Override
	public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry beanDefinitionRegistry) throws BeansException {
		String beanSuffixName = StringUtils.capitalize(OssConstants.BEAN_SUFFIX_NAME);
		multiOssProperties.getClients().forEach((productCode, ossProperties) -> {
			AbstractBeanDefinition beanDefinition = BeanDefinitionBuilder.genericBeanDefinition(OssClient.class,
					() -> OssClientUtils.buildOssClient(ossProperties))
					.getRawBeanDefinition();
			beanDefinition.setInitMethodName("init");
			beanDefinition.setDestroyMethodName("shutDown");
			beanDefinitionRegistry.registerBeanDefinition(productCode + beanSuffixName, beanDefinition);
		});
	}
}

public class KeplerBeanFactoryPostInitializer implements BeanFactoryPostProcessor {
	@Override
	public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
		Map<String, AviatorFunction> aviatorFunctionMap = beanFactory.getBeansOfType(AviatorFunction.class);
		if (aviatorFunctionMap.size() > 0) {
			log.info("初始化自定义RuleLoader...");
			aviatorFunctionMap.forEach((k, v) -> {
				log.info("加载Rule:{}", k);
				AviatorEvaluator.addFunction(v);
			});
		}
		RuleLoader.initRule();
	}
}

protected void invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory beanFactory) {
	PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(beanFactory, getBeanFactoryPostProcessors());

	// Detect a LoadTimeWeaver and prepare for weaving, if found in the meantime
	// (e.g. through an @Bean method registered by ConfigurationClassPostProcessor)
	if (beanFactory.getTempClassLoader() == null && beanFactory.containsBean(LOAD_TIME_WEAVER_BEAN_NAME)) {
		beanFactory.addBeanPostProcessor(new LoadTimeWeaverAwareProcessor(beanFactory));
		beanFactory.setTempClassLoader(new ContextTypeMatchClassLoader(beanFactory.getBeanClassLoader()));
	}
}

/**
	 * Return the list of BeanFactoryPostProcessors that will get applied
	 * to the internal BeanFactory.
	 */
	public List<BeanFactoryPostProcessor> getBeanFactoryPostProcessors() {
		return this.beanFactoryPostProcessors;
	}

public interface ApplicationContextInitializer<C extends ConfigurableApplicationContext> {

	/**
	 * Initialize the given application context.
	 * @param applicationContext the application to configure
	 */
	void initialize(C applicationContext);
}

public static void invokeBeanFactoryPostProcessors(
        ConfigurableListableBeanFactory beanFactory, List<BeanFactoryPostProcessor> beanFactoryPostProcessors) {
 
    // Invoke BeanDefinitionRegistryPostProcessors first, if any.
    Set<String> processedBeans = new HashSet<String>();
 
    // 1.判断beanFactory是否为BeanDefinitionRegistry，beanFactory为DefaultListableBeanFactory,
    // 而DefaultListableBeanFactory实现了BeanDefinitionRegistry接口，因此这边为true
    if (beanFactory instanceof BeanDefinitionRegistry) {
        BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory;
        // 用于存放普通的BeanFactoryPostProcessor
        List<BeanFactoryPostProcessor> regularPostProcessors = new LinkedList<BeanFactoryPostProcessor>();
        // 用于存放BeanDefinitionRegistryPostProcessor
        List<BeanDefinitionRegistryPostProcessor> registryProcessors = new LinkedList<BeanDefinitionRegistryPostProcessor>();
 
        // 2.首先处理入参中的beanFactoryPostProcessors
        // 遍历所有的beanFactoryPostProcessors, 将BeanDefinitionRegistryPostProcessor和普通BeanFactoryPostProcessor区分开
        for (BeanFactoryPostProcessor postProcessor : beanFactoryPostProcessors) {
            if (postProcessor instanceof BeanDefinitionRegistryPostProcessor) {
                // 2.1 如果是BeanDefinitionRegistryPostProcessor
                BeanDefinitionRegistryPostProcessor registryProcessor =
                        (BeanDefinitionRegistryPostProcessor) postProcessor;
                // 2.1.1 直接执行BeanDefinitionRegistryPostProcessor接口的postProcessBeanDefinitionRegistry方法
                registryProcessor.postProcessBeanDefinitionRegistry(registry);
                // 2.1.2 添加到registryProcessors(用于最后执行postProcessBeanFactory方法)
                registryProcessors.add(registryProcessor);
            } else {
                // 2.2 否则，只是普通的BeanFactoryPostProcessor
                // 2.2.1 添加到regularPostProcessors(用于最后执行postProcessBeanFactory方法)
                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.
        // 用于保存本次要执行的BeanDefinitionRegistryPostProcessor
        List<BeanDefinitionRegistryPostProcessor> currentRegistryProcessors = new ArrayList<BeanDefinitionRegistryPostProcessor>();
 
        // First, invoke the BeanDefinitionRegistryPostProcessors that implement PriorityOrdered.
        // 3.调用所有实现PriorityOrdered接口的BeanDefinitionRegistryPostProcessor实现类
        // 3.1 找出所有实现BeanDefinitionRegistryPostProcessor接口的Bean的beanName
        String[] postProcessorNames =
                beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
        // 3.2 遍历postProcessorNames
        for (String ppName : postProcessorNames) {
            // 3.3 校验是否实现了PriorityOrdered接口
            if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) {
                // 3.4 获取ppName对应的bean实例, 添加到currentRegistryProcessors中,
                // beanFactory.getBean: 这边getBean方法会触发创建ppName对应的bean对象, 目前暂不深入解析
                currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
                // 3.5 将要被执行的加入processedBeans，避免后续重复执行
                processedBeans.add(ppName);
            }
        }
        // 3.6 进行排序(根据是否实现PriorityOrdered、Ordered接口和order值来排序)
        sortPostProcessors(currentRegistryProcessors, beanFactory);
        // 3.7 添加到registryProcessors(用于最后执行postProcessBeanFactory方法)
        registryProcessors.addAll(currentRegistryProcessors);
        // 3.8 遍历currentRegistryProcessors, 执行postProcessBeanDefinitionRegistry方法
        invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
        // 3.9 执行完毕后, 清空currentRegistryProcessors
        currentRegistryProcessors.clear();
 
        // Next, invoke the BeanDefinitionRegistryPostProcessors that implement Ordered.
        // 4.调用所有实现了Ordered接口的BeanDefinitionRegistryPostProcessor实现类（过程跟上面的步骤3基本一样）
        // 4.1 找出所有实现BeanDefinitionRegistryPostProcessor接口的类, 这边重复查找是因为执行完上面的BeanDefinitionRegistryPostProcessor,
        // 可能会新增了其他的BeanDefinitionRegistryPostProcessor, 因此需要重新查找
        postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
        for (String ppName : postProcessorNames) {
            // 校验是否实现了Ordered接口，并且还未执行过
            if (!processedBeans.contains(ppName) && beanFactory.isTypeMatch(ppName, Ordered.class)) {
                currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
                processedBeans.add(ppName);
            }
        }
        sortPostProcessors(currentRegistryProcessors, beanFactory);
        registryProcessors.addAll(currentRegistryProcessors);
        // 4.2 遍历currentRegistryProcessors, 执行postProcessBeanDefinitionRegistry方法
        invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
        currentRegistryProcessors.clear();
 
        // Finally, invoke all other BeanDefinitionRegistryPostProcessors until no further ones appear.
        // 5.最后, 调用所有剩下的BeanDefinitionRegistryPostProcessors
        boolean reiterate = true;
        while (reiterate) {
            reiterate = false;
            // 5.1 找出所有实现BeanDefinitionRegistryPostProcessor接口的类
            postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
            for (String ppName : postProcessorNames) {
                // 5.2 跳过已经执行过的
                if (!processedBeans.contains(ppName)) {
                    currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
                    processedBeans.add(ppName);
                    // 5.3 如果有BeanDefinitionRegistryPostProcessor被执行, 则有可能会产生新的BeanDefinitionRegistryPostProcessor,
                    // 因此这边将reiterate赋值为true, 代表需要再循环查找一次
                    reiterate = true;
                }
            }
            sortPostProcessors(currentRegistryProcessors, beanFactory);
            registryProcessors.addAll(currentRegistryProcessors);
            // 5.4 遍历currentRegistryProcessors, 执行postProcessBeanDefinitionRegistry方法
            invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
            currentRegistryProcessors.clear();
        }
 
        // Now, invoke the postProcessBeanFactory callback of all processors handled so far.
        // 6.调用所有BeanDefinitionRegistryPostProcessor的postProcessBeanFactory方法(BeanDefinitionRegistryPostProcessor继承自BeanFactoryPostProcessor)
        invokeBeanFactoryPostProcessors(registryProcessors, beanFactory);
        // 7.最后, 调用入参beanFactoryPostProcessors中的普通BeanFactoryPostProcessor的postProcessBeanFactory方法
        invokeBeanFactoryPostProcessors(regularPostProcessors, beanFactory);
    } else {
        // Invoke factory processors registered with the context instance.
        invokeBeanFactoryPostProcessors(beanFactoryPostProcessors, beanFactory);
    }
 
    // 到这里 , 入参beanFactoryPostProcessors和容器中的所有BeanDefinitionRegistryPostProcessor已经全部处理完毕,
    // 下面开始处理容器中的所有BeanFactoryPostProcessor
 
    // Do not initialize FactoryBeans here: We need to leave all regular beans
    // uninitialized to let the bean factory post-processors apply to them!
    // 8.找出所有实现BeanFactoryPostProcessor接口的类
    String[] postProcessorNames =
            beanFactory.getBeanNamesForType(BeanFactoryPostProcessor.class, true, false);
 
    // Separate between BeanFactoryPostProcessors that implement PriorityOrdered,
    // Ordered, and the rest.
    // 用于存放实现了PriorityOrdered接口的BeanFactoryPostProcessor
    List<BeanFactoryPostProcessor> priorityOrderedPostProcessors = new ArrayList<BeanFactoryPostProcessor>();
    // 用于存放实现了Ordered接口的BeanFactoryPostProcessor的beanName
    List<String> orderedPostProcessorNames = new ArrayList<String>();
    // 用于存放普通BeanFactoryPostProcessor的beanName
    List<String> nonOrderedPostProcessorNames = new ArrayList<String>();
    // 8.1 遍历postProcessorNames, 将BeanFactoryPostProcessor按实现PriorityOrdered、实现Ordered接口、普通三种区分开
    for (String ppName : postProcessorNames) {
        // 8.2 跳过已经执行过的
        if (processedBeans.contains(ppName)) {
            // skip - already processed in first phase above
        } else if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) {
            // 8.3 添加实现了PriorityOrdered接口的BeanFactoryPostProcessor
            priorityOrderedPostProcessors.add(beanFactory.getBean(ppName, BeanFactoryPostProcessor.class));
        } else if (beanFactory.isTypeMatch(ppName, Ordered.class)) {
            // 8.4 添加实现了Ordered接口的BeanFactoryPostProcessor的beanName
            orderedPostProcessorNames.add(ppName);
        } else {
            // 8.5 添加剩下的普通BeanFactoryPostProcessor的beanName
            nonOrderedPostProcessorNames.add(ppName);
        }
    }
 
    // First, invoke the BeanFactoryPostProcessors that implement PriorityOrdered.
    // 9.调用所有实现PriorityOrdered接口的BeanFactoryPostProcessor
    // 9.1 对priorityOrderedPostProcessors排序
    sortPostProcessors(priorityOrderedPostProcessors, beanFactory);
    // 9.2 遍历priorityOrderedPostProcessors, 执行postProcessBeanFactory方法
    invokeBeanFactoryPostProcessors(priorityOrderedPostProcessors, beanFactory);
 
    // Next, invoke the BeanFactoryPostProcessors that implement Ordered.
    // 10.调用所有实现Ordered接口的BeanFactoryPostProcessor
    List<BeanFactoryPostProcessor> orderedPostProcessors = new ArrayList<BeanFactoryPostProcessor>();
    for (String postProcessorName : orderedPostProcessorNames) {
        // 10.1 获取postProcessorName对应的bean实例, 添加到orderedPostProcessors, 准备执行
        orderedPostProcessors.add(beanFactory.getBean(postProcessorName, BeanFactoryPostProcessor.class));
    }
    // 10.2 对orderedPostProcessors排序
    sortPostProcessors(orderedPostProcessors, beanFactory);
    // 10.3 遍历orderedPostProcessors, 执行postProcessBeanFactory方法
    invokeBeanFactoryPostProcessors(orderedPostProcessors, beanFactory);
 
    // Finally, invoke all other BeanFactoryPostProcessors.
    // 11.调用所有剩下的BeanFactoryPostProcessor
    List<BeanFactoryPostProcessor> nonOrderedPostProcessors = new ArrayList<BeanFactoryPostProcessor>();
    for (String postProcessorName : nonOrderedPostProcessorNames) {
        // 11.1 获取postProcessorName对应的bean实例, 添加到nonOrderedPostProcessors, 准备执行
        nonOrderedPostProcessors.add(beanFactory.getBean(postProcessorName, BeanFactoryPostProcessor.class));
    }
    // 11.2 遍历nonOrderedPostProcessors, 执行postProcessBeanFactory方法
    invokeBeanFactoryPostProcessors(nonOrderedPostProcessors, beanFactory);
 
    // Clear cached merged bean definitions since the post-processors might have
    // modified the original metadata, e.g. replacing placeholders in values...
    // 12.清除元数据缓存（mergedBeanDefinitions、allBeanNamesByType、singletonBeanNamesByType），
    // 因为后处理器可能已经修改了原始元数据，例如， 替换值中的占位符...
    beanFactory.clearMetadataCache();
}

private static void sortPostProcessors(List<?> postProcessors, ConfigurableListableBeanFactory beanFactory) {
    Comparator<Object> comparatorToUse = null;
    if (beanFactory instanceof DefaultListableBeanFactory) {
        // 1.获取设置的比较器
        comparatorToUse = ((DefaultListableBeanFactory) beanFactory).getDependencyComparator();
    }
    if (comparatorToUse == null) {
        // 2.如果没有设置比较器, 则使用默认的OrderComparator
        comparatorToUse = OrderComparator.INSTANCE;
    }
    // 3.使用比较器对postProcessors进行排序
    Collections.sort(postProcessors, comparatorToUse);
}

@Override
public int compare(Object o1, Object o2) {
    return doCompare(o1, o2, null);
}
 
private int doCompare(Object o1, Object o2, OrderSourceProvider sourceProvider) {
    // 判断o1是否实现了PriorityOrdered接口
    boolean p1 = (o1 instanceof PriorityOrdered);
    // 判断o2是否实现了PriorityOrdered接口
    boolean p2 = (o2 instanceof PriorityOrdered);
    // 1.如果o1实现了PriorityOrdered接口, 而o2没有, 则o1排前面
    if (p1 && !p2) {
        return -1;
    }
    // 2.如果o2实现了PriorityOrdered接口, 而o1没有, 则o2排前面
    else if (p2 && !p1) {
        return 1;
    }
 
    // 3.如果o1和o2都实现（都没实现）PriorityOrdered接口
    // Direct evaluation instead of Integer.compareTo to avoid unnecessary object creation.
    // 拿到o1的order值, 如果没实现Ordered接口, 值为Ordered.LOWEST_PRECEDENCE
    int i1 = getOrder(o1, sourceProvider);
    // 拿到o2的order值, 如果没实现Ordered接口, 值为Ordered.LOWEST_PRECEDENCE
    int i2 = getOrder(o2, sourceProvider);
    // 4.通过order值(order值越小, 优先级越高)排序
    return (i1 < i2) ? -1 : (i1 > i2) ? 1 : 0;
}

/** Cache of singleton objects: bean name --> bean instance */
private final Map<String, Object> singletonObjects = new ConcurrentHashMap<String, Object>(256);

/** Cache of singleton factories: bean name --> ObjectFactory */
private final Map<String, ObjectFactory<?>> singletonFactories = new HashMap<String, ObjectFactory<?>>(16);

/** Cache of early singleton objects: bean name --> bean instance */
private final Map<String, Object> earlySingletonObjects = new HashMap<String, Object>(16);

protected Object getSingleton(String beanName, boolean allowEarlyReference) {
    Object singletonObject = this.singletonObjects.get(beanName);
    if (singletonObject == null && isSingletonCurrentlyInCreation(beanName)) {
        synchronized (this.singletonObjects) {
            singletonObject = this.earlySingletonObjects.get(beanName);
            if (singletonObject == null && allowEarlyReference) {
                ObjectFactory<?> singletonFactory = this.singletonFactories.get(beanName);
                if (singletonFactory != null) {
                    singletonObject = singletonFactory.getObject();
                    this.earlySingletonObjects.put(beanName, singletonObject);
                    this.singletonFactories.remove(beanName);
                }
            }
        }
    }
    return (singletonObject != NULL_OBJECT ? singletonObject : null);
}

this.earlySingletonObjects.put(beanName, singletonObject);
                        this.singletonFactories.remove(beanName);
从singletonFactories中移除，并放入earlySingletonObjects中。其实也就是从三级缓存移动到了二级缓存。

public interface ObjectFactory<T> {
    T getObject() throws BeansException;
}

protected void addSingletonFactory(String beanName, ObjectFactory<?> singletonFactory) {
    Assert.notNull(singletonFactory, "Singleton factory must not be null");
    synchronized (this.singletonObjects) {
        if (!this.singletonObjects.containsKey(beanName)) {
            this.singletonFactories.put(beanName, singletonFactory);
            this.earlySingletonObjects.remove(beanName);
            this.registeredSingletons.add(beanName);
        }
    }
}