Call a method any time other methods are called

Question

Is there any way to make a sort of \"supermethod\" that is called every time a method is called, even for non-defined methods? Sort of like this:

public void         


        

Answer 1

Sure you can do this, not with standard java but with AspectJ

Here is a simple example:

Aspect with an after-advice

package net.fsa.aspectj.test;


public aspect SuperMethdAspect {

    pointcut afterPointCut() : execution(public * com.my.pack.age.MyClass.*(..));

    after() : afterPointCut() {
        System.out.println("Super");
    }
}

You target class

package com.my.pack.age;

public class MyClass {

    public void onStart() {
        System.out.println("Start");
    }

    public void onEnd() {
        System.out.println("End");
    }
}

And finally some test app

package net.fsa.aspectj.test;

import com.my.pack.age.MyClass;

public class MyApp {

    public static void main(String... args) {
        MyClass myClass = new MyClass();
        myClass.onStart();
        myClass.onEnd();
    }
}

Output

Start
Super
End
Super