dewafer / spring-annotation-advisor-example

This example reminds me how to do Spring AOP and mimic a @Async annotation.

Spring Annotation Advisor Example

Please follow the link for more detailed introduction in Chinese: SpringBoot自定义注解切面

This example demonstrated 2 ways to implement Annotated Advisor for Beans in Spring boot project.

First is using MethodInterceptor through BeanFactoryPointcutAdvisor and AbstractBeanFactoryAwareAdvisingPostProcessor.

Second is using traditional @Aspect.

The MethodInterceptor way

For the first implementation, please refer to CrossConcernConfig.java.

This is how Spring implement its @Async annotation.

The AOP way

For the second implementation, please refer to CrossConcernAopConfig.java, and CrossConcernAspect.java.

This is the traditional AOP way.

And?

This is a simple spring boot web application, you can start this application by running AnnotationAdvisorPocApplication in any way you like.

2 endpoints are provided: http://localhost:8080/ and http://localhost:8080/exception.

The call to the first endpoint will invoke a interface based business service BusinessService which has its default implementation BusinessServiceImpl. This simple service will return current system time in ISO_ZONED_DATE_TIME format.

The call to the second endpoint will invoke a non-interface based business service NonInterfaceService which itself is the default implementation. This simple service will thrown a runtime exception at random chance.

Both of the services have CrossConcern annotation on their methods, so the methods will be intercepted by 2 ways described above.

The MethodInterceptor way will do a simple try-catch-finally around the invocations and do simple logs at before, catch and finally stage of the invocation.

The Aop way has implemented before, after, afterReturning, afterThrowing and around advices for the method invocation and will do simple logs at each adivce.