springboot 拦截器之Advisor不生效问题

SPringBoot使用方法注解拦截器时遇到不生效问题记录：

定义方法注解


@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Documented
public @interface DataScope
{boolean enable() default true;}

定义 Advisor


@Getter
@EqualsAndHashCode(callSuper = true)
@Component
public class DataPermissionAnnotationAdvisor extends AbstractPointcutAdvisor {private final Advice advice;private final Pointcut pointcut;public DataPermissionAnnotationAdvisor() {this.advice = new DataScopeAnnotationInterceptor();this.pointcut = this.buildPointcut();}protected Pointcut buildPointcut() {Pointcut classPointcut = new AnnotationMatchingPointcut(DataScope.class, true);Pointcut methodPointcut = new AnnotationMatchingPointcut(null, DataScope.class, true);return new ComposablePointcut(classPointcut).union(methodPointcut);}}

定义拦截器


public class DataScopeAnnotationInterceptor implements MethodInterceptor {@Overridepublic Object invoke(MethodInvocation methodInvocation) throws Throwable {Logger log = LoggerFactory.getLogger(DataScopeAnnotationInterceptor.class);log.debug("DataScopeAnnotationInterceptor 拦截器：" + methodInvocation.getMethod().getName());try {// 执行逻辑return methodInvocation.proceed();} finally {// 出栈if (dataPermission != null) {DataPermissionContextHolder.remove();}}}}

在要使用拦截器的方法体上方添加注解

@Service
public class UserService {@DataScopepublic void method01() {// 查询订单UserDO user = userMapper.selectById(1);System.out.println(user);}}

完成以上全部代码，在调用motho01()方法时，正常就应该先执行拦截器，再执行method01中的方法。但在springboot-2.1.3RELEASE版本时，拦截器却没有生效。
网上搜罗一圈没有现成的办法，只能老老实实看源码了，功夫不负有心人，请看以下源码：

public class InfrastructureAdvisorAutoProxyCreator extends AbstractAdvisorAutoProxyCreator {@Nullableprivate ConfigurableListableBeanFactory beanFactory;public InfrastructureAdvisorAutoProxyCreator() {}protected void initBeanFactory(ConfigurableListableBeanFactory beanFactory) {super.initBeanFactory(beanFactory);this.beanFactory = beanFactory;}//在获取拦截器时，通过这个方法判断是否是有效拦截器的意思。
//其中 this.beanFactory.getBeanDefinition(beanName).getRole() == 2 这个条件就是导致拦截器不生效的小虫子。protected boolean isEligibleAdvisorBean(String beanName) {return this.beanFactory != null && this.beanFactory.containsBeanDefinition(beanName) && this.beanFactory.getBeanDefinition(beanName).getRole() == 2;}
}

解决办法：

只需在DataPermissionAnnotationAdvisor 类上方添加Role(2)这个注解，拦截器就生效了。

像这样就可以了。

@Getter
@EqualsAndHashCode(callSuper = true)
@Component
@Role(2)
public class DataPermissionAnnotationAdvisor extends AbstractPointcutAdvisor {private final Advice advice;private final Pointcut pointcut;public DataPermissionAnnotationAdvisor() {this.advice = new DataScopeAnnotationInterceptor();this.pointcut = this.buildPointcut();}protected Pointcut buildPointcut() {Pointcut classPointcut = new AnnotationMatchingPointcut(DataScope.class, true);Pointcut methodPointcut = new AnnotationMatchingPointcut(null, DataScope.class, true);return new ComposablePointcut(classPointcut).union(methodPointcut);}}

@Role注解

标识Bean的类别
种类：

1. ROLE_APPLICATION = 0
- bean的默认角色
- 标识应用的主要的主要角色
- 通常对应于用户定义的bean
1. ROLE_APPLICATION = 1
- 标识较大配置的一部分
- 通常是仔细观察特定的ComponentDefinition时重要的提示，而不是体现在应用中
1. ROLE_INFRASTRUCTURE = 2
- 标识后台角色，与最终用户无关
- 通常供是内部工作的bean使用