@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Scope("refresh")
@Documented
public @interface RefreshScope {
    ScopedProxyMode proxyMode() default ScopedProxyMode.TARGET_CLASS;
}

public enum ScopedProxyMode {
   /**
    * Default typically equals {@link #NO}, unless a different default
    * has been configured at the component-scan instruction level.
    */
   DEFAULT,
   /**
    * Do not create a scoped proxy.
    */
   NO,
   /**
    * Create a JDK dynamic proxy implementing <i>all</i> interfaces exposed by
    * the class of the target object.
    */
   INTERFACES,
   /**
    * Create a class-based proxy (uses CGLIB).
    */
   TARGET_CLASS;
}

//ConfigurationClassBeanDefinitionReader配置類(lèi)解析代碼片段
definitionHolder = AnnotationConfigUtils.applyScopedProxyMode(scopeMetadata, definitionHolder, this.registry);

//如果需要生產(chǎn)代理則創(chuàng)建一個(gè)ScopedProxy的BeanDefinition
static BeanDefinitionHolder applyScopedProxyMode(
		ScopeMetadata metadata, BeanDefinitionHolder definition, BeanDefinitionRegistry registry) {

	ScopedProxyMode scopedProxyMode = metadata.getScopedProxyMode();
	if (scopedProxyMode.equals(ScopedProxyMode.NO)) {
		return definition;
	}
	boolean proxyTargetClass = scopedProxyMode.equals(ScopedProxyMode.TARGET_CLASS);
	return ScopedProxyCreator.createScopedProxy(definition, registry, proxyTargetClass);
}

//createScopedProxy 代碼片段 可以看到BeanDefinition是ScopedProxyFactoryBean
RootBeanDefinition proxyDefinition = new RootBeanDefinition(ScopedProxyFactoryBean.class);

@Override
public Object getObject() {
	if (this.proxy == null) {
		throw new FactoryBeanNotInitializedException();
	}
    //返回代理對(duì)象
	return this.proxy;
}
@Override
public void setBeanFactory(BeanFactory beanFactory) {
   //...省略其他代碼
    
   // Add an introduction that implements only the methods on ScopedObject.
   //增加一個(gè)攔截使用ScopedObject來(lái)被代理對(duì)象調(diào)用方法
   ScopedObject scopedObject = new DefaultScopedObject(cbf, this.scopedTargetSource.getTargetBeanName());
   //委托ScopedObject去執(zhí)行
   pf.addAdvice(new DelegatingIntroductionInterceptor(scopedObject));

   // Add the AopInfrastructureBean marker to indicate that the scoped proxy
   // itself is not subject to auto-proxying! Only its target bean is. AOP時(shí)復(fù)用這個(gè)代理對(duì)象
   pf.addInterface(AopInfrastructureBean.class);
   //創(chuàng)建代理對(duì)象   
   this.proxy = pf.getProxy(cbf.getBeanClassLoader());
}

public interface ScopedObject extends RawTargetAccess {
  //返回當(dāng)前代理對(duì)象后面的目標(biāo)對(duì)象
   Object getTargetObject();
   void removeFromScope();
}
public class DefaultScopedObject implements ScopedObject, Serializable {
    //...省略字段信息和構(gòu)造器
	@Override
	public Object getTargetObject() {
        //從容器中獲取
		return this.beanFactory.getBean(this.targetBeanName);
	}
	@Override
	public void removeFromScope() {
		this.beanFactory.destroyScopedBean(this.targetBeanName);
	}
}

//AbstractBeanFactory doGetBean()代碼片段
String scopeName = mbd.getScope();
//獲取對(duì)應(yīng)的scope
final Scope scope = this.scopes.get(scopeName);
//參數(shù)檢查省略。。。
try {
    //使用的對(duì)應(yīng)的Socpe去獲取bean 獲取不到則使用后面的`ObjectFactory`
   Object scopedInstance = scope.get(beanName, () -> {    
       //ObjectFactory lambda表達(dá)式 怎么創(chuàng)建bean	
      beforePrototypeCreation(beanName);
      try {
         return createBean(beanName, mbd, args);
      }
      finally {
         afterPrototypeCreation(beanName);
      }
   });
   bean = getObjectForBeanInstance(scopedInstance, name, beanName, mbd);

//GenericScope 中獲取get實(shí)現(xiàn)
public Object get(String name, ObjectFactory<?> objectFactory) {
    //從緩存中獲取 緩存的實(shí)現(xiàn)就是ConcurrentHashMap
    BeanLifecycleWrapper value = this.cache.put(name, new BeanLifecycleWrapper(name, objectFactory));
    this.locks.putIfAbsent(name, new ReentrantReadWriteLock());
    try {
        return value.getBean();
    } catch (RuntimeException var5) {
        this.errors.put(name, var5);
        throw var5;
    }
}

    private static class BeanLifecycleWrapper {
        //當(dāng)前bean對(duì)象
        private Object bean;
        //銷(xiāo)毀回調(diào)
        private Runnable callback;
        //bean名稱(chēng)
        private final String name;
        //bean工廠
        private final ObjectFactory<?> objectFactory;
        //獲取
        public Object getBean() {
            if (this.bean == null) {
                synchronized(this.name) {
                    if (this.bean == null) {
                        this.bean = this.objectFactory.getObject();
                    }
                }
            }
            return this.bean;
        }
       //銷(xiāo)毀
        public void destroy() {
            if (this.callback != null) {
                synchronized(this.name) {
                    Runnable callback = this.callback;
                    if (callback != null) {
                        callback.run();
                    }
                    this.callback = null;
                    //只為null
                    this.bean = null;
                }
            }
        }
}

public synchronized Set<String> refresh() {
     //刷新環(huán)境
     Set<String> keys = this.refreshEnvironment();
     //刷新bean 其實(shí)就是銷(xiāo)毀refreshScope中緩存的bean
     this.scope.refreshAll();
     return keys;
}
//RefreshScope刷新
public void refreshAll() {
     super.destroy();
     this.context.publishEvent(new RefreshScopeRefreshedEvent());
}