java - How do you get RequestMapping request in AOP advice from a Spring controller?

Question

Given some kind of controller with a request mapping

@RequestMapping(value="/some/path", method=RequestMethod.POST)

How would you retrieve the method value (RequestMethod.POST) in the aspect class?

I want to keep track of all the controller methods that perform a POST request.

Thanks

Answer 1

@AL13N: Your own answer is correct, but you do not need to use reflection if you just bind the annotation to a parameter. Here is an example in POJO + AspectJ. In Spring AOP it should be the same, though:

Sample controller with main method:

package de.scrum_master.app;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class MyController {
    @RequestMapping(value="/some/path", method=RequestMethod.POST)
    public void foo() {
        System.out.println("foo");
    }
    public void bar() {
        System.out.println("bar");
    }

    public static void main(String[] args) {
        MyController controller = new MyController();
        controller.foo();
        controller.bar();
    }
}

Aspect:

package de.scrum_master.aspect;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.web.bind.annotation.RequestMapping;

public aspect RequestMappingInterceptor {
    @Pointcut(
        "within(@org.springframework.stereotype.Controller *) && " +
        "@annotation(requestMapping) && " +
        "execution(* *(..))"
    )
    public void controller(RequestMapping requestMapping) {}

    @Before("controller(requestMapping)")
    public void advice(JoinPoint thisJoinPoint, RequestMapping requestMapping) {
        System.out.println(thisJoinPoint);
        System.out.println("  " + requestMapping);
        System.out.println("  " + requestMapping.method()[0]);
    }
}

BTW, the && execution(* *(..)) part of the pointcut is probably not necessary in Spring AOP because it just knows execution pointcuts anyway. In AspectJ you need to exclude call() and other types of pointcuts because AspectJ is more powerful. It does not hurt though and is safer and more explicit.

Console output:

execution(void de.scrum_master.app.MyController.foo())
  @org.springframework.web.bind.annotation.RequestMapping(headers=[], name=, value=[/some/path], produces=[], method=[POST], params=[], consumes=[])
  POST
foo
bar

Edit: Swapped parameters so as to make the joinpoint the first advice method parameter, because Spring AOP seems to insist on this order while AspectJ does not.