Spring BeanDefinition的作用

BeanDefinition是描述bean的一个接口

 

public interface BeanDefinition extends AttributeAccessor, BeanmetadataElement {
    
    //单例常量
	String SCOPE_SINGLETON = ConfigurableBeanFactory.SCOPE_SINGLETON;
·   
    
	String SCOPE_PROTOTYPE = ConfigurableBeanFactory.SCOPE_PROTOTYPE;


	int ROLE_APPLICATION = 0;

	int ROLE_SUPPORT = 1;

	int ROLE_INFRASTRUCTURE = 2;

    //设置父bean的名称
	void setParentName(@Nullable String parentName);

	@Nullable
	String getParentName();

    //设置类名
	void setBeanClassName(@Nullable String beanClassName);
    
	@Nullable
	String getBeanClassName();
    

	void setScope(@Nullable String scope);


	@Nullable
	String getScope();

    //是否懒加载
	void setLazyInit(boolean lazyInit);

	boolean isLazyInit();

	void setDependsOn(@Nullable String... dependsOn);

	@Nullable
	String[] getDependsOn();

	void setAutowireCandidate(boolean autowireCandidate);

	boolean isAutowireCandidate();

	void setPrimary(boolean primary);
    
    
	boolean isPrimary();

	void setFactoryBeanName(@Nullable String factoryBeanName);

	@Nullable
	String getFactoryBeanName();

	void setFactoryMethodName(@Nullable String factoryMethodName);

	@Nullable
	String getFactoryMethodName();


	ConstructorArgumentValues getConstructorArgumentValues();

	default boolean hasConstructorArgumentValues() {
		return !getConstructorArgumentValues().isEmpty();
	}

	MutablePropertyValues getPropertyValues();

	default boolean hasPropertyValues() {
		return !getPropertyValues().isEmpty();
	}

	void setInitMethodName(@Nullable String initMethodName);

	@Nullable
	String getInitMethodName();

	void setDestroyMethodName(@Nullable String destroyMethodName);

	@Nullable
	String getDestroyMethodName();

	void setRole(int role);

	int getRole();

	void setDescription(@Nullable String description);

	@Nullable
	String getDescription();

	ResolvableType getResolvableType();

	boolean isSingleton();

	boolean isPrototype();

	boolean isAbstract();

	@Nullable
	String getResourceDescription();

	@Nullable
	BeanDefinition getOriginatingBeanDefinition();

}

 AnnotatedBeanDefinition继承了BeanDefiniton并新增了两个方法,getmetadata和getFactoryMethodmetadata

public interface AnnotatedBeanDefinition extends BeanDefinition {
    
    //获取类的注解信息
	Annotationmetadata getmetadata();
    //获取factory方法的注解信息
	@Nullable
	Methodmetadata getFactoryMethodmetadata();

}

此接口用于解析注解的bean