Hi Simone,
>>if I understand correctly, when a method annotated with @Observable is
executed, you want to see if there are fields in that class with an instance
of an observer, and call a method on the observer.<<
Actually, when a method is annotated with @Observable (before executing and
at the time of compiling codes) I want to add (not see) those interfaces
that annotated with @Observer, as private fields in the observable and I
want to add them because both observer and observable are EJB session beans
so the application server will take the burden of instantiating those
observers using its injection technique
What I need is something like this:
for(MyObserver o : observers){
declare a private field with a name in this instance of observable class
}
On Mon, Apr 19, 2010 at 2:22 PM, Simone Gianni <[email protected]> wrote:
> Hi Mohammad,
> if I understand correctly, when a method annotated with @Observable is
> executed, you want to see if there are fields in that class with an instance
> of an observer, and call a method on the observer.
>
> You can use AspectJ to execute an advice before/after/around the execution
> of @Obervable methods, and use thisJoinPoint or the this() construct to find
> the instance of the method.
>
> Once you are there, you must use plain java reflection, and not AspectJ, to
> find fields in that class that contains an observer and invoke observer
> methods.
>
> To add @EJB annotation to all fields of type X where X is annotated with
> @Observer, you can use declare @class and write a type pattern that uses
> @Observer annotation. If @Observer annotation is placed on methods, you can
> use hasmethod() to find classes that has such methods, but beware cause
> hasmethod is somewhat experimental.
>
> Hope this helps,
> Simone
>
> 2010/4/19 is_maximum <[email protected]>
>
>
>> Thanks Simone, yes this is exactly what I want... but another question is
>> that this is used using 'declare' and as far as I know declare is placed
>> in
>> aspect definition. How can I place it in a for-loop.
>>
>> Let me tell you the scenario may be I am in wrong way...
>>
>> I am trying to implement an observer pattern in EJB 3.0. I saw many
>> implementation using aspectJ but mine is a little different. The
>> difference
>> is that I want to inject observer into observable...
>>
>> Because session beans are managed object and in my case both observer and
>> observable supposed to be session beans I want application server injects
>> observer session beans in observable SB and then call observer methods
>>
>> These observer and observable methods will be annotated by the developer
>> with say @Observer and @Observable
>>
>> What I wanted was to look for @Observer methods and find their interface
>> and
>> put them like this:
>>
>> @EJB
>> private ObserverInterface1 observer1
>>
>> than each time the determined method is called I can call
>> observer1.notifyObserver() method
>>
>> Can you please help me on this?
>>
>>
>>
>>
>> Simone Gianni-2 wrote:
>> >
>> > Hi Mohammad,
>> > maybe you are loooking for the declare annotation statement?
>> >
>> http://www.eclipse.org/aspectj/doc/next/adk15notebook/annotations-declare.html
>> >
>> > Simone
>> >
>> >
>>
>>
>> -----
>> --
>> Regards
>>
>> Mohammad Norouzi
>>
>> Help each other to reach the future faster
>>
>> http://pixelshot.wordpress.com Pixelshot Photoblog
>>
>> http://brainable.blogspot.com Brainable Blog
>>
>>
>> --
>> View this message in context:
>> http://old.nabble.com/How-to-rewrite-a-class-with-AspectJ-tp28280867p28287273.html
>> Sent from the AspectJ - users mailing list archive at Nabble.com.
>>
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