Couple other questions - Re: [aspectj-users] How do i apply a pointcut to only an object which implements an interface or is of type X.class or subclass

Wed, 03 Dec 2008 17:23:39 -0800

Cool thanks, but NOTE that DIDN'T work for me either. I did find something that did thanks to the "+" you pointed out.

NO
  public pointcut PT_new() :

      within(com.foo.BarInterface+) && // not sure why this doesn't work??
      call(*.new(..));
YES
    public pointcut PT_new() :

        call(public com.foo.BarInterface+.new(..));


TWO MORE QUESTIONS.

QUESTION 1

Can someone explain the difference in behavior here between call and execute?? I'm not sure i'm really caught on to the difference in these two.

    public pointcut PT_new() :

        call(public com.foo.BarInterface+.new(..));

    Object around()
                  throws Exception :
        PT_new() {
        return null;
    }


BarInterface bar = new BarInterfaceImpl();
Here bar == null


    public pointcut PT_new() :

        execute(public com.foo.BarInterface+.new(..));

    Object around()
                  throws Exception :
        PT_new() {
        return null;
    }


BarInterface bar = new BarInterfaceImpl();
Here bar != null, rather its a new BarInterfaceImpl instance


QUESTION 2

What happens when a the original method does not throw an Exception but the advice throws an Exception?? Does the "throws Exception" get woven into the original Constructor (or Method)? I tested it and i guess you would just get an unhandled exception. This seems real bad and i guess is something to watch out for??

e.g.
public class BarInterfaceImpl implements BarInterface {
    public BarInterfaceImpl() {} // does not throw Exception
}


    public pointcut PT_new() :

        call(public com.foo.BarInterface+.new(..));

    Object around()
                  throws Exception :
        PT_new() {
        throw Exception();
    }





Andrew Eisenberg wrote: 
  public pointcut PT_new() :

      within(com.foo.BarInterface) &&
      call(*.new(..));

    

Try this instead:

   public pointcut PT_new() :
       within(com.foo.BarInterface+) &&
       call(*.new(..));

'+' means to include subclasses.
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