@Override
protected boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {
// 排除内联类
if (beanDefinition.getMetadata().getClassName().contains("$")) {
return false;
}
// 对于concreteClass，直接返回true
if (super.isCandidateComponent(beanDefinition)) {
return true;
}
if (!includeAbstractClasses) {
return false;
}
// 非concrete，但指定了includeAbstractClasses=true
beanDefinition.setBeanClassName(NonInstantiatableClassFactoryBean.class.getName());
beanDefinition
.getConstructorArgumentValues()
.addIndexedArgumentValue(
0, beanDefinition.getMetadata().getClassName(), Class.class.getName());
return true;
}
@Override
protected Set<BeanDefinitionHolder> doScan(String... basePackages) {
Assert.notEmpty(basePackages, "At least one base package must be specified");
Set<BeanDefinitionHolder> beanDefinitions = new LinkedHashSet<BeanDefinitionHolder>();
for (String basePackage : basePackages) {
Set<BeanDefinition> candidates = findCandidateComponents(basePackage);
for (BeanDefinition candidate : candidates) {
ScopeMetadata scopeMetadata = this.scopeMetadataResolver.resolveScopeMetadata(candidate);
candidate.setScope(scopeMetadata.getScopeName());
String beanName = this.beanNameGenerator.generateBeanName(candidate, this.registry);
if (candidate instanceof AbstractBeanDefinition) {
postProcessBeanDefinition((AbstractBeanDefinition) candidate, beanName);
}
if (candidate instanceof AnnotatedBeanDefinition) {
processCommonDefinitionAnnotations((AnnotatedBeanDefinition) candidate);
}
ScannedGenericBeanDefinition bd = (ScannedGenericBeanDefinition) candidate; // 通用bean扫描
bd.setBeanClassName(HessianServiceExporter.class.getName()); // 设置bean名称
bd.setBeanClass(HessianServiceExporter.class); // 设置bean类
bd.getPropertyValues().add("service", registry.getBeanDefinition(beanName)); // 设置属性 service
String[] interfaces = bd.getMetadata().getInterfaceNames(); // 获得元数据、接口名称
if (interfaces == null || interfaces.length == 0) continue;
Class interf = null;
try {
interf = Class.forName(interfaces[0]); // 获得接口
} catch (ClassNotFoundException e) {
continue;
}
bd.getPropertyValues().add("serviceInterface", interf); // 设置属性 serviceInterface
candidate = bd;
BeanDefinitionHolder definitionHolder =
new BeanDefinitionHolder(candidate, "/" + beanName); // 新bean定义持有
definitionHolder =
applyScopedProxyMode(scopeMetadata, definitionHolder, this.registry); // 应用范围代理模式
beanDefinitions.add(definitionHolder); // 将bean定义持有放入bean定义持有set中
registerBeanDefinition(definitionHolder, this.registry); // 注册bean定义
}
}
if (beanDefinitions.isEmpty()) {
System.out.println("not service be scaned");
} else {
for (BeanDefinitionHolder holder : beanDefinitions) {
AnnotatedBeanDefinition definition =
(AnnotatedBeanDefinition) holder.getBeanDefinition(); // 注释的bean定义
System.out.println("service:" + holder.getBeanName()); // 注释的bean定义名称
System.out.println(
"service:" + definition.getMetadata().getAnnotationTypes()); // 注释的bean定义类型
}
}
return beanDefinitions;
}
void processCommonDefinitionAnnotations(AnnotatedBeanDefinition abd) {
AnnotationMetadata metadata = abd.getMetadata();
if (metadata.isAnnotated(Primary.class.getName())) {
abd.setPrimary(true);
}
if (metadata.isAnnotated(Lazy.class.getName())) {
abd.setLazyInit(attributesFor(metadata, Lazy.class).getBoolean("value"));
}
if (metadata.isAnnotated(DependsOn.class.getName())) {
abd.setDependsOn(attributesFor(metadata, DependsOn.class).getStringArray("value"));
}
if (abd instanceof AbstractBeanDefinition) {
if (metadata.isAnnotated(Role.class.getName())) {
Integer role = attributesFor(metadata, Role.class).getNumber("value");
((AbstractBeanDefinition) abd).setRole(role);
}
}
}
/**
* Derive a bean name from one of the annotations on the class.
*
* @param annotatedDef the annotation-aware bean definition
* @return the bean name, or <code>null</code> if none is found
*/
protected String determineBeanNameFromAnnotation(AnnotatedBeanDefinition annotatedDef) {
AnnotationMetadata amd = annotatedDef.getMetadata();
Set<String> types = amd.getAnnotationTypes();
String beanName = null;
for (String type : types) {
Map<String, Object> attributes = amd.getAnnotationAttributes(type);
if (isStereotypeWithNameValue(type, amd.getMetaAnnotationTypes(type), attributes)) {
String value = (String) attributes.get("value");
if (StringUtils.hasLength(value)) {
if (beanName != null && !value.equals(beanName)) {
throw new IllegalStateException(
"Stereotype annotations suggest inconsistent "
+ "component names: '"
+ beanName
+ "' versus '"
+ value
+ "'");
}
beanName = value;
}
}
}
return beanName;
}
/**
* Determine whether the given bean definition qualifies as candidate.
*
* <p>The default implementation checks whether the class is concrete (i.e. not abstract and not
* an interface). Can be overridden in subclasses.
*
* @param beanDefinition the bean definition to check
* @return whether the bean definition qualifies as a candidate component
*/
protected boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {
return (beanDefinition.getMetadata().isConcrete()
&& beanDefinition.getMetadata().isIndependent());
}
public boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {
return super.isCandidateComponent(beanDefinition)
&& beanDefinition.getMetadata().hasAnnotation(CustomizeComponent.class.getName());
}
