Dynamic configuration of pointcuts (from database)

[blaiseg]

Hi everyone.

In my (web) app will to fire some events. Of course I can open my source code and insert some code :

EventManager evtManager = EventManager.getInstance();
Event event = new Event(this.getClass(), "currentMethodName", methodArg1, methodArg2);
evtManager.fire(event);

But I want to dynamically decide if an event will be fired and use Spring..

ConfigDao dao = // Injected
EventManager evtManager = // Injected
Event event = new Event(this.getClass(), "currentMethodName", methodArg1, methodArg2);
if ( dao.willFireEvent(event) ) {
  evtManager.fire(event);
}

That's not really good (I think) so insted of calling the ConfigDao and copying this code in many classes I will use the AOP capabilities.
I want to write a "ConfiguredPointcut" which use the "ConfigDao" to know if a method will fire an event. But I never have used Spring AOP and really don't know here to start.

I have tried to write a custom "org.springframework.aop.Pointcut" but I d'ont know how to use It..

Can someone help me ?

Thanks

[ramnivas]

You should be able to achieve this with the existing mechanism available in Spring AOP. Essentially, you will write a poitncut to select methods of your choice, inject the aspect with your DAO, and the advice in the aspect will call dao.willFireEvent(event).

-Ramnivas