8:59 a.m.
Hi,
First of all my apologies, if I am asking the question in wrong place,
though my gut feeling tells me that people on this list would know the most
about this matter.
I am trying to write my own subsystem, and have wrote most of it, using
https://docs.jboss.org/author/display/AS72/Extending+JBoss+AS+7 and maven
archtype there.
I have my own annotation, which user can add onto the attribute of EJB or
CDI bean, and deployment processor for my subsystem finds all classes with
this annotation.
From my understanding inside deployment processor executed during
Phase.PARSE, getAttachment(Attachments.ANNOTATION_INDEX) will enable me to
find all classes with my annotation, without loading the classes (jandex).
After finding them all, I am trying to modify the class to inject instance
to that annotated field with value that has been created in my subsystem
for that deployment.
I think options are to rely on Weld, or modify bytecode to set this field
with my value stored in my subsystem when class is instantiated.
If I change phase
Am I going in the right direction with this, what would be recommended way
to do something like this? Any pointers would be welcome.
Regards,
Dejan
8:28 a.m.
Hi Ales,
Thanks for reply, I ll try to elaborate bit more. Simple example of what I
am trying to do (besides figuring out how it all works together) is this:
I am trying to create custom subsystem with deployment processor that will
pick up any ear or war deployed, if that deployment contains say class A
with let say my own annotation @SomeServiceContext on attribute SomeService
someService, it will create instance of class SomeService for that
deployment. Idea then is when this class A is instantiated I want the
attribute someService to be initialized with SomeService class created for
this deploymen.
More less this might be viewed as very simple implementation of my own
injection, reason is purely learning, I am aware that Weld does all this
for us already. This is more along the lines - figure out how weld does it
in the wildfly.
From the examples that I have followed, I am able to create subsystem,
and
detect if deployment contains my annotation. What I was trying to ask is
what would be the best way to proceed from here, few options that came to
my mind are:
1. Service in my subsystem might bind SomeService for this deployment into
jndi, and I could use weld extensions to process classes with my
@SomeServiceContext annotation to inject correct value of
SomeService prepared for that deployment during deploy of the application
or
2. More complicated option, might be to somehow modify the bytecode of the
class A, for example append as last line of default constructor of class A
code that will set the attribute SomeService someService to the value
that service in my subsystem created for this deployment.
Option 2 is far more complicated and interesting to me, as from my naive
thinking this might be similar even to how weld is implemented, find all
annotated classes, and modify the their bytecode to inject correct values
when they are instantiated, combined with wildfly subsystem and deployers.
Regards,
Dejan
On Thu, Nov 21, 2013 at 1:59 PM, Ales Justin <ales.justin(a)gmail.com> wrote:
9:02 a.m.
Well, there is 1M ways to do this. :-)
1) looks OK, but you'll then need to add a provider for SomeService
2) sounds doable as well, where you then need to be able to get this SomeService from
static context
Weld does this on its own, so you should check there.
WildFly just helps setup few things -- mostly SPI impls.
-Ales
On 21 Nov 2013, at 15:28, Dejan Kitic <kdejan(a)gmail.com> wrote:
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