Aop.java

public class AOPConfig {

    public void configure(@Observes AOPConfigEvent config) {
        config.add( intercept(Service.class).onAllMethodsReturning(String.class) );
    }
}

public void intercept(@Observes @Return(String.class) 
                                @MethodName("doSomething") 
                                @MethodAnnotated(CutHere.class) Before before) {
    if (getHourOfTheDay() == 0) {
        before.preventAndReturn("Impossible d'utiliser cette méthode maintenant");
    } else {
        logger.info("Méthode " + before.getMethod() + " accédée par " + before.getParameter(0));
    }
}