Performance method audit with spring, aspectj and annotation based - spring

Question

I have a question about how to do an time performance audit over a method using annotations, aspectj and spring
basically I have:
public class MyClass{
#TimeAudit
public myMethod(){
//do something
}
}
i want to just log(or just print it in console) somewhere the time spent for that method to be executed. My problem is how an aspect will intercept that annotation and after that count the time that method spent.
How i can do that?
to clarify a little bit my question:
I have the annotation:
#Retention(RetentionPolicy.RUNTIME)
#Target({ElementType.METHOD, ElementType.TYPE})
public #interface TimeAudit {
}
i have my aspect:
#Aspect
#Component
public class PerformanceTimeExecutionAudit {
#Around("execution(* *(..)) && #annotation(timeAudit)")
public Object doLogTime(final ProceedingJoinPoint pjp, TimeAudit timeAudit) throws Throwable {
System.out.println("Start time..."+System.currentTimeMillis());
Object output = pjp.proceed();
System.out.println("End time..."+System.currentTimeMillis());
return output;
}
}
on other class:
#Repository
public class MyClass{
#Override
#TimeAudit
public void myMethod(){
//do something
}
}
but the aspect is not triggered for that method were i put #TimeAudit.
What i do wrong?

Answer 1

To summarise a short tutorial how to create an aspect in conjunction with Annotation to be useful for newcomers in this area.
you need the library dependencies:
aspectjrt
aspectjweaver
spring-aop
along with others spring dependencies like spring context etc.
2 Create your Annotation example:
#Retention(RetentionPolicy.RUNTIME)
#Target({ElementType.METHOD, ElementType.TYPE})
public #interface TimeAudit {
//put here whatever fields you need
}
3 Create your aspect, example:
#Aspect
#Component
public class PerformanceTimeExecutionAudit {
#Around("execution(* *(..)) && #annotation(TimeAudit)")
public Object doLogTime(final ProceedingJoinPoint pjp, TimeAudit timeAudit) throws Throwable {
System.out.println("Start time..."+System.currentTimeMillis());
Object output = pjp.proceed();
//this is with #Around, you can use in your asspect all others annotations like #Before, #After etc. this depends on your logic behavior.
System.out.println("End time..."+System.currentTimeMillis());
return output;
}
}
4 On your your methods use your annotation like this - A little observations is that you can create the Annotation to behave as you want.
#Repository
public class MyClass{
#Override
#TimeAudit
public void myMethod(){
//do something
}
}
//- this #TimeAudit can contain params, this depends on your Annotation logic creation
be sure your spring context is scanning your packages where you have the Aspect, and also the package where you have the class annotated. Or you can declare them as beans in spring context configuration.
Be sure that you enabled the AOP. You need something like this in your spring config:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="........
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation=".........
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<aop:aspectj-autoproxy />
That's it.
I hope it will be useful for someone.