Abstract BeanFactory-based PointcutAdvisor that allows for any Advice
to be configured as reference to an Advice bean in a BeanFactory.
Specifying the name of an advice bean instead of the advice object itself
(if running within a BeanFactory) increases loose coupling at initialization time,
in order to not initialize the advice object until the pointcut actually matches.
Specifying the name of an advice bean instead of the advice object itself (if running within a BeanFactory) increases loose coupling at initialization time, in order to not initialize the advice object until the pointcut actually matches.