Note that extended bean factories might support further scopes. 10 | */ 11 | String SCOPE_SINGLETON = ConfigurableBeanFactory.SCOPE_SINGLETON; 12 | /** 13 | * Scope identifier for the standard prototype scope: "prototype". 14 | *
Note that extended bean factories might support further scopes. 15 | */ 16 | String SCOPE_PROTOTYPE = ConfigurableBeanFactory.SCOPE_PROTOTYPE; 17 | /** 18 | * Role hint indicating that a {@code BeanDefinition} is a major part 19 | * of the application. Typically corresponds to a user-defined bean. 20 | */ 21 | int ROLE_APPLICATION = 0; 22 | /** 23 | * Role hint indicating that a {@code BeanDefinition} is a supporting 24 | * part of some larger configuration, typically an outer 25 | * {@link org.springframework.beans.factory.parsing.ComponentDefinition}. 26 | * {@code SUPPORT} beans are considered important enough to be aware 27 | * of when looking more closely at a particular 28 | * {@link org.springframework.beans.factory.parsing.ComponentDefinition}, 29 | * but not when looking at the overall configuration of an application. 30 | */ 31 | int ROLE_SUPPORT = 1; 32 | /** 33 | * Role hint indicating that a {@code BeanDefinition} is providing an 34 | * entirely background role and has no relevance to the end-user. This hint is 35 | * used when registering beans that are completely part of the internal workings 36 | * of a {@link org.springframework.beans.factory.parsing.ComponentDefinition}. 37 | */ 38 | int ROLE_INFRASTRUCTURE = 2; 39 | /** 40 | * Return the name of the parent definition of this bean definition, if any. 41 | */ 42 | String getParentName(); 43 | /** 44 | * Set the name of the parent definition of this bean definition, if any. 45 | */ 46 | void setParentName(String parentName); 47 | /** 48 | * Return the current bean class name of this bean definition. 49 | *
Note that this does not have to be the actual class name used at runtime, in 50 | * case of a child definition overriding/inheriting the class name from its parent. 51 | * Hence, do not consider this to be the definitive bean type at runtime but 52 | * rather only use it for parsing purposes at the individual bean definition level. 53 | */ 54 | String getBeanClassName(); 55 | /** 56 | * Override the bean class name of this bean definition. 57 | *
The class name can be modified during bean factory post-processing, 58 | * typically replacing the original class name with a parsed variant of it. 59 | */ 60 | void setBeanClassName(String beanClassName); 61 | /** 62 | * Return the factory bean name, if any. 63 | */ 64 | String getFactoryBeanName(); 65 | /** 66 | * Specify the factory bean to use, if any. 67 | */ 68 | void setFactoryBeanName(String factoryBeanName); 69 | /** 70 | * Return a factory method, if any. 71 | */ 72 | String getFactoryMethodName(); 73 | /** 74 | * Specify a factory method, if any. This method will be invoked with 75 | * constructor arguments, or with no arguments if none are specified. 76 | * The method will be invoked on the specified factory bean, if any, 77 | * or otherwise as a static method on the local bean class. 78 | * @param factoryMethodName static factory method name, 79 | * or {@code null} if normal constructor creation should be used 80 | */ 81 | void setFactoryMethodName(String factoryMethodName); 82 | /** 83 | * Return the name of the current target scope for this bean, 84 | * or {@code null} if not known yet. 85 | */ 86 | String getScope(); 87 | /** 88 | * Override the target scope of this bean, specifying a new scope name. 89 | */ 90 | void setScope(String scope); 91 | /** 92 | * Return whether this bean should be lazily initialized, i.e. not 93 | * eagerly instantiated on startup. Only applicable to a singleton bean. 94 | */ 95 | boolean isLazyInit(); 96 | /** 97 | * Set whether this bean should be lazily initialized. 98 | *
If {@code false}, the bean will get instantiated on startup by bean 99 | * factories that perform eager initialization of singletons. 100 | */ 101 | void setLazyInit(boolean lazyInit); 102 | /** 103 | * Return the bean names that this bean depends on. 104 | */ 105 | String[] getDependsOn(); 106 | /** 107 | * Set the names of the beans that this bean depends on being initialized. 108 | * The bean factory will guarantee that these beans get initialized first. 109 | */ 110 | void setDependsOn(String... dependsOn); 111 | /** 112 | * Return whether this bean is a candidate for getting autowired into some other bean. 113 | */ 114 | boolean isAutowireCandidate(); 115 | /** 116 | * Set whether this bean is a candidate for getting autowired into some other bean. 117 | */ 118 | void setAutowireCandidate(boolean autowireCandidate); 119 | /** 120 | * Return whether this bean is a primary autowire candidate. 121 | * If this value is true for exactly one bean among multiple 122 | * matching candidates, it will serve as a tie-breaker. 123 | */ 124 | boolean isPrimary(); 125 | /** 126 | * Set whether this bean is a primary autowire candidate. 127 | *
If this value is true for exactly one bean among multiple 128 | * matching candidates, it will serve as a tie-breaker. 129 | */ 130 | void setPrimary(boolean primary); 131 | /** 132 | * Return the constructor argument values for this bean. 133 | *
The returned instance can be modified during bean factory post-processing. 134 | * @return the ConstructorArgumentValues object (never {@code null}) 135 | */ 136 | ConstructorArgumentValues getConstructorArgumentValues(); 137 | /** 138 | * Return the property values to be applied to a new instance of the bean. 139 | *
The returned instance can be modified during bean factory post-processing. 140 | * @return the MutablePropertyValues object (never {@code null}) 141 | */ 142 | MutablePropertyValues getPropertyValues(); 143 | /** 144 | * Return whether this a Singleton, with a single, shared instance 145 | * returned on all calls. 146 | */ 147 | boolean isSingleton(); 148 | /** 149 | * Return whether this a Prototype, with an independent instance 150 | * returned for each call. 151 | */ 152 | boolean isPrototype(); 153 | /** 154 | * Return whether this bean is "abstract", that is, not meant to be instantiated. 155 | */ 156 | boolean isAbstract(); 157 | /** 158 | * Get the role hint for this {@code BeanDefinition}. The role hint 159 | * provides the frameworks as well as tools with an indication of 160 | * the role and importance of a particular {@code BeanDefinition}. 161 | */ 162 | int getRole(); 163 | /** 164 | * Return a human-readable description of this bean definition. 165 | */ 166 | String getDescription(); 167 | /** 168 | * Return a description of the resource that this bean definition 169 | * came from (for the purpose of showing context in case of errors). 170 | */ 171 | String getResourceDescription(); 172 | /** 173 | * Return the originating BeanDefinition, or {@code null} if none. 174 | * Allows for retrieving the decorated bean definition, if any. 175 | *
Note that this method returns the immediate originator. Iterate through the 176 | * originator chain to find the original BeanDefinition as defined by the user. 177 | */ 178 | BeanDefinition getOriginatingBeanDefinition(); 179 | } 180 | ``` 181 | 182 | 可以看到上面的很多属性和方法都很熟悉，例如类名、scope、属性、构造函数参数列表、依赖的bean、是否是单例类、是否是懒加载等，其实就是将Bean的定义信息存储到这个BeanDefinition相应的属性中，后面对Bean的操作就直接对BeanDefinition进行，例如拿到这个BeanDefinition后，可以根据里面的类名、构造函数、构造函数参数，使用反射进行对象创建。BeanDefinition是一个接口，是一个抽象的定义，实际使用的是其实现类，如ChildBeanDefinition、RootBeanDefinition、GenericBeanDefinition等。BeanDefinition继承了AttributeAccessor，说明它具有处理属性的能力；BeanDefinition继承了BeanMetadataElement，说明它可以持有Bean元数据元素，作用是可以持有XML文件的一个bean标签对应的Object。 -------------------------------------------------------------------------------- /pdf/Spring源码学习一：源码分析概述.pdf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/wind7rui/Spring-learning/6b209d02d897794963c3c87bcb21e35bd4a23caa/pdf/Spring源码学习一：源码分析概述.pdf 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