源码分析

Advisor 排序规则

1. Aspect Bean 顺序，根据 Bean 的 Order 注解或其它 Order 标识排序。
2. Aspect 注解顺序 Around.class，Before.class，After.class，AfterReturning.class，AfterThrowing.class。
3. 方法名称。

实现

1. org.springframework.aop.aspectj.annotation.ReflectiveAspectJAdvisorFactory#adviceMethodComparator 对 Aspect Bean 中的 Aspect 方法排序，首先根据注解，其次根据方法名称。
2. org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator#sortAdvisors 对 Aspect Bean 排序，使用稳定的拓扑排序算法，基于规则 org.springframework.core.annotation.AnnotationAwareOrderComparator#INSTANCE。

验证

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11

@Order(1)
@Aspect
@Component
// [SpringAOP][LoggingA]
public class LoggingAAspectSpringBean {}

@Order(10)
@Aspect
@Component
// [SpringAOP][LoggingB]
public class LoggingBAspectSpringBean {}

执行日志

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11

[SpringAOP][LoggingA] Around begin action: testPublic
[SpringAOP][LoggingA] Before action: testPublic
[SpringAOP][LoggingB] Around begin action: testPublic
[SpringAOP][LoggingB] Before action: testPublic
testPublic
[SpringAOP][LoggingB] AfterReturning action: testPublic
[SpringAOP][LoggingB] After action: testPublic
[SpringAOP][LoggingB] Around end action: testPublic
[SpringAOP][LoggingA] AfterReturning action: testPublic
[SpringAOP][LoggingA] After action: testPublic
[SpringAOP][LoggingA] Around end action: testPublic

LoggingAAspectSpringBean

LoggingBAspectSpringBean

org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator#sortAdvisors

(org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator#findEligibleAdvisors)

(org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator#getAdvicesAndAdvisorsForBean)

END