How to find methods that @Observes for specific events

[gvagenas]

Hi guys,

Is there an easy way to find all the methods that observe for a specific event?
CDI event producing/consuming mechanism is great to have a decoupled and really efficient design, but its getting hard when someone is trying to go through the code and debug it when he reach a fire(event) method, particularly when its not your code (sometimes happens with your code also ;-) ).

Thanks
George

[diegocoronel]

its easy to find it with JBoss Tools...

[gvagenas]

Any idea how to do it with out JBoss Tools ?

Thanks

[milenkovic.m]

You may use method "resolveObserverMethods" provided by BeanManager.

let say that you have a method that observes for a SimpleEvent without any qualifiers (just to simplify a bit)

• inject the bean manager
• call manager.resolveObserverMethods ( new SimpleEvent() ) and it shall return a set of all methods that observe for a SimpleEvent

public class TestClass {
     @Inject BeanManager manager;
      public void resolveObservers(){ 
          this.manager.resolveObserverMethods ( new SimpleEvent() );    
     }
}
public class HasAnObserver {
          public void simpleObserver(@Observes SimpleEvent event){ }
}

if you need a qualifier you should specify it after the first parameter

[gvagenas]

Thanks Marko.