122 lines
3.7 KiB
122 lines
3.7 KiB
# Spring BeanNameGenerator
|
|
|
|
- Author: [HuiFer](https://github.com/huifer)
|
|
- 源码阅读仓库: [SourceHot-spring](https://github.com/SourceHot/spring-framework-read)
|
|
|
|
- `org.springframework.beans.factory.support.BeanNameGenerator`
|
|
- 方法用来生成 beanName
|
|
|
|
```java
|
|
public interface BeanNameGenerator {
|
|
|
|
/**
|
|
* Generate a bean name for the given bean definition.
|
|
* 生成 beanName
|
|
* @param definition the bean definition to generate a name for
|
|
* @param registry the bean definition registry that the given definition
|
|
* is supposed to be registered with
|
|
* @return the generated bean name
|
|
*/
|
|
String generateBeanName(BeanDefinition definition, BeanDefinitionRegistry registry);
|
|
|
|
}
|
|
```
|
|
|
|
|
|
|
|
## DefaultBeanNameGenerator
|
|
|
|
- `org.springframework.beans.factory.support.DefaultBeanNameGenerator`
|
|
|
|
- 调用工具类方法进行生成
|
|
|
|
```JAVA
|
|
@Override
|
|
public String generateBeanName(BeanDefinition definition, BeanDefinitionRegistry registry) {
|
|
return BeanDefinitionReaderUtils.generateBeanName(definition, registry);
|
|
}
|
|
```
|
|
|
|
1. ClassName + # + 十六进制字符
|
|
2. parentName + \$child + # + 十六进制字符
|
|
3. factoryBeanName +\$created+# + 十六进制字符
|
|
4. beanName + # + 序号
|
|
|
|
```java
|
|
public static String generateBeanName(
|
|
BeanDefinition definition, BeanDefinitionRegistry registry, boolean isInnerBean)
|
|
throws BeanDefinitionStoreException {
|
|
|
|
// 获取 bean class 的名称
|
|
// Class.getName()
|
|
String generatedBeanName = definition.getBeanClassName();
|
|
if (generatedBeanName == null) {
|
|
// 父类名称是否存在
|
|
if (definition.getParentName() != null) {
|
|
generatedBeanName = definition.getParentName() + "$child";
|
|
}
|
|
// 工厂 beanName 是否为空
|
|
else if (definition.getFactoryBeanName() != null) {
|
|
generatedBeanName = definition.getFactoryBeanName() + "$created";
|
|
}
|
|
}
|
|
if (!StringUtils.hasText(generatedBeanName)) {
|
|
throw new BeanDefinitionStoreException("Unnamed bean definition specifies neither " +
|
|
"'class' nor 'parent' nor 'factory-bean' - can't generate bean name");
|
|
}
|
|
|
|
String id = generatedBeanName;
|
|
if (isInnerBean) {
|
|
// Inner bean: generate identity hashcode suffix.
|
|
// 组装名称
|
|
// 生成名称 + # + 16 进制的一个字符串
|
|
id = generatedBeanName + GENERATED_BEAN_NAME_SEPARATOR + ObjectUtils.getIdentityHexString(definition);
|
|
}
|
|
else {
|
|
// Top-level bean: use plain class name with unique suffix if necessary.
|
|
// 唯一beanName设置
|
|
// // beanName + # + 序号
|
|
return uniqueBeanName(generatedBeanName, registry);
|
|
}
|
|
return id;
|
|
}
|
|
```
|
|
|
|
## AnnotationBeanNameGenerator
|
|
|
|
1. 获取注解的 value 作为 beanName
|
|
2. 类名首字母小写
|
|
|
|
```java
|
|
@Override
|
|
public String generateBeanName(BeanDefinition definition, BeanDefinitionRegistry registry) {
|
|
if (definition instanceof AnnotatedBeanDefinition) {
|
|
// 从注解中获取 beanName
|
|
// 获取注解的value属性值
|
|
String beanName = determineBeanNameFromAnnotation((AnnotatedBeanDefinition) definition);
|
|
if (StringUtils.hasText(beanName)) {
|
|
// Explicit bean name found.
|
|
// 如果存在直接返回
|
|
return beanName;
|
|
}
|
|
}
|
|
// Fallback: generate a unique default bean name.
|
|
// 默认beanName
|
|
// 类名,首字母小写
|
|
return buildDefaultBeanName(definition, registry);
|
|
}
|
|
```
|
|
|
|
## FullyQualifiedAnnotationBeanNameGenerator
|
|
|
|
- 全类名
|
|
|
|
```java
|
|
@Override
|
|
protected String buildDefaultBeanName(BeanDefinition definition) {
|
|
String beanClassName = definition.getBeanClassName();
|
|
Assert.state(beanClassName != null, "No bean class name set");
|
|
return beanClassName;
|
|
}
|
|
```
|