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public interface BeanDefinition extends AttributeAccessor, BeanMetadataElement {

   // 单例
   String SCOPE_SINGLETON = ConfigurableBeanFactory.SCOPE_SINGLETON;
  // 原型
   String SCOPE_PROTOTYPE = ConfigurableBeanFactory.SCOPE_PROTOTYPE;
  // 设置模式
     void setScope(String scope);
   String getScope();

   // 描述Bean的角色，通过getRole、setRole
  // ROLE_APPLICATION表示这个Bean是用户自己定义的
   int ROLE_APPLICATION = 0;
  // ROLE_SUPPORT表示这个Bean是某些复杂配置的支撑部分
   int ROLE_SUPPORT = 1;
  // ROLE_INFRASTRUCTURE表示这是Spring内部的Bean
   int ROLE_INFRASTRUCTURE = 2;


   // Modifiable attributes

   // 配置parent名称 <bean parent="">
   void setParentName(String parentName);
   String getParentName();

   // 配置Bean的class全路径 <bean class="">
   void setBeanClassName(String beanClassName);
   String getBeanClassName();

   
   

   // 是否懒加载  <bean lazy-init="">
   void setLazyInit(boolean lazyInit);
   boolean isLazyInit();

   // 配置Bean的依赖对象 <dean depends-on="">
   void setDependsOn(String... dependsOn);
   String[] getDependsOn();

  // 配置Bean是否自动装配 <bean autowire-candidate="">
   void setAutowireCandidate(boolean autowireCandidate);
   boolean isAutowireCandidate();

   // 配置Bean是否为首选的Bean <bean primary="">
   void setPrimary(boolean primary);
   boolean isPrimary();

   // 配置FactoryBean的名字 <bean factory-bean="">
   void setFactoryBeanName(String factoryBeanName);
   String getFactoryBeanName();

   // 配置工厂方法 <bean factory-bean="" factory-method="">
   void setFactoryMethodName(String factoryMethodName);
   String getFactoryMethodName();

   // 返回Bean构造方法的参数值
   ConstructorArgumentValues getConstructorArgumentValues();

   // 获取普通属性的集合
   MutablePropertyValues getPropertyValues();


   // Read-only attributes

   // 是否单例
   boolean isSingleton();
  // 是否原型
   boolean isPrototype();
// 是否抽象
   boolean isAbstract();

   
   int getRole();

   // 获取Bean的描述
   String getDescription();

   // 获取Bean的资源描述
   String getResourceDescription();

   // 如果当前BeanDefinition是一个代理对象，会返回原始的BeanDefinition
   BeanDefinition getOriginatingBeanDefinition();

}

public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccessor
      implements BeanDefinition, Cloneable {

   
  // 默认就是单例模式singleton
   public static final String SCOPE_DEFAULT = "";

   
   public static final int AUTOWIRE_NO = AutowireCapableBeanFactory.AUTOWIRE_NO;

  
   public static final int AUTOWIRE_BY_NAME = AutowireCapableBeanFactory.AUTOWIRE_BY_NAME;

   
   public static final int AUTOWIRE_BY_TYPE = AutowireCapableBeanFactory.AUTOWIRE_BY_TYPE;

   
   public static final int AUTOWIRE_CONSTRUCTOR = AutowireCapableBeanFactory.AUTOWIRE_CONSTRUCTOR;

   

   /**
    * Constant that indicates no dependency check at all.
    * @see #setDependencyCheck
    */
   public static final int DEPENDENCY_CHECK_NONE = 0;

   /**
    * Constant that indicates dependency checking for object references.
    * @see #setDependencyCheck
    */
   public static final int DEPENDENCY_CHECK_OBJECTS = 1;

   /**
    * Constant that indicates dependency checking for "simple" properties.
    * @see #setDependencyCheck
    * @see org.springframework.beans.BeanUtils#isSimpleProperty
    */
   public static final int DEPENDENCY_CHECK_SIMPLE = 2;

   /**
    * Constant that indicates dependency checking for all properties
    * (object references as well as "simple" properties).
    * @see #setDependencyCheck
    */
   public static final int DEPENDENCY_CHECK_ALL = 3;

   /**
    * Constant that indicates the container should attempt to infer the
    * {@link #setDestroyMethodName destroy method name} for a bean as opposed to
    * explicit specification of a method name. The value {@value} is specifically
    * designed to include characters otherwise illegal in a method name, ensuring
    * no possibility of collisions with legitimately named methods having the same
    * name.
    * <p>Currently, the method names detected during destroy method inference
    * are "close" and "shutdown", if present on the specific bean class.
    */
   public static final String INFER_METHOD = "(inferred)";


   private volatile Object beanClass;
// bean的作用域，对应bean标签属性scope
   private String scope = SCOPE_DEFAULT;
// 是否抽象，对应bean标签属性abstract
   private boolean abstractFlag = false;
// 是否延迟加载，对应bean标签属性lazy-init
   private boolean lazyInit = false;
// 自动注入模式，对应bean标签属性autowire
   private int autowireMode = AUTOWIRE_NO;
// 依赖检查，spring3.0中弃用
   private int dependencyCheck = DEPENDENCY_CHECK_NONE;
// 一个bean的实例化依赖于另一个bean的实例化，对应bean标签属性depends-on
   private String[] dependsOn;
// 如果该属性设置为false，容器在进行自动装配对象时不会考虑该bean，但是该bean本身还是可以使用自动装配来注入其他bean的，对应bean标签属性autowire-candidate
   private boolean autowireCandidate = true;
// 自动装配时出现多个bean的候选时，如果primary设置为true，则作为首选，对应bean标签属性primary
   private boolean primary = false;
// 用于记录Qualifier，对应子元素qualifier
   private final Map<String, AutowireCandidateQualifier> qualifiers =
         new LinkedHashMap<String, AutowireCandidateQualifier>(0);
// 允许访问非公开的构造器和方法，通过程序设置，不在xml中配置
   private boolean nonPublicAccessAllowed = true;
// 是否以一种宽松的模式解析构造函数，如果为false，如果spring无法精确地定位某个构造函数的话则抛出异常
   private boolean lenientConstructorResolution = true;
// 记录工厂bean对应的id，对应bean标签属性factory-bean
   private String factoryBeanName;
// 记录工厂bean中生产bean的方法，对应bean标签属性factory-method
   private String factoryMethodName;
// 记录构造函数注入属性，对应bean标签属性contructor-arg
   private ConstructorArgumentValues constructorArgumentValues;
// 普通属性集合
   private MutablePropertyValues propertyValues;
// 方法重写的持有者，记录lookup-method、replaced-method元素
   private MethodOverrides methodOverrides = new MethodOverrides();
// 初始化方法，对应bean标签属性init-method
   private String initMethodName;
// 销毁方法，对应bean标签属性destory-method
   private String destroyMethodName;
// 是否执行init-method，通过程序设置，不在xml中配置
   private boolean enforceInitMethod = true;
// 是否执行destory-method，通过程序设置，不在xml中配置
   private boolean enforceDestroyMethod = true;
// 是否是用户定义的而不是应用程序本身定义的，创建AOP时为true，通过程序设置，不在xml中配置
   private boolean synthetic = false;
// 定义这个bean的角色，ROLE_APPLICATION：用户  ROLE_SUPPORT：某些复杂配置的一部分  ROLE_INFRASTRUCTURE：完全内部使用，与用户无关
   private int role = BeanDefinition.ROLE_APPLICATION;
// bean的描述信息
   private String description;
// bean定义的资源
   private Resource resource;

}

public class RootBeanDefinition extends AbstractBeanDefinition

public class ChildBeanDefinition extends AbstractBeanDefinition

public class GenericBeanDefinition extends AbstractBeanDefinition

public interface AnnotatedBeanDefinition extends BeanDefinition

public class AnnotatedGenericBeanDefinition extends GenericBeanDefinition implements AnnotatedBeanDefinition