[ACCEPTED]-Getting a return value or exception from AspectJ?-pointcut
You can use after() returning and after() throwing advices as in beginning 3 of the following document. If you're using @AspectJ syntax please 2 refer to @AfterReturning and @AfterThrowing annotations (you can find 1 samples here).
You can also get return value using after returing advice.
package com.eos.poc.test;
public class AOPDemo {
public static void main(String[] args) {
AOPDemo demo = new AOPDemo();
String result= demo.append("Eclipse", " aspectJ");
}
public String append(String s1, String s2) {
System.out.println("Executing append method..");
return s1 + s2;
}
}
The 1 defined aspect for getting return value:
public aspect DemoAspect {
pointcut callDemoAspectPointCut():
call(* com.eos.poc.test.AOPDemo.append(*,*));
after() returning(Object r) :callDemoAspectPointCut(){
System.out.println("Return value: "+r.toString()); // getting return value
}
Using an around() advice, you can get the return 6 value of the intercepted method call by 5 using proceed(). You can even change the value returned 4 by the method if you want to.
For instance, suppose 3 you have a method m() inside class MyClass:
public class MyClass {
int m() {
return 2;
}
}
Suppose 2 you have the following aspect in its own 1 .aj file:
public aspect mAspect {
pointcut mexec() : execution(* m(..));
int around() : mexec() {
// use proceed() to do the computation of the original method
int original_return_value = proceed();
// change the return value of m()
return original_return_value * 100;
}
}
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