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Posted to users@felix.apache.org by Michiel Vermandel <mv...@yahoo.com> on 2013/04/30 14:12:30 UTC
[iPOJO] Usage of @Requires in superclass
Hello,
Can I use @Requires on a field of a (Abstract) class that will be extended?
Of course only the extending classes will be instantiated.
Thank you
-----------------
http://www.codessentials.com - Your essential software, for free!
Follow us at http://twitter.com/#!/Codessentials
Re: [iPOJO] Usage of @Requires in superclass
Posted by lessonz <le...@gmail.com>.
Is there an issue filed somewhere we can follow?
On Wed, May 1, 2013 at 1:24 AM, Clement Escoffier <
clement.escoffier@gmail.com> wrote:
> Hi,
>
> As Neil said, the current annotation processing would too brittle if we
> try to analyze parent classes.
> So unfortunately, no, @Requires from parent classes are not processed.
>
> However we have plan to implement this support in iPOJO 2.x (work already
> started).
>
> Regards,
>
> Clement
>
> On 30 avr. 2013, at 22:43, Neil Bartlett <nj...@gmail.com> wrote:
>
> > I'm speculating here, but I imagine iPOJO doesn't handle this for the
> > same reason that bnd doesn't. Both analyze the annotations at
> > build-time to generate the runtime metadata (and in iPOJO's case,
> > injected bytecodes). At build time, the only class we can guarantee to
> > have visibility of is the actual component class that is being
> > analyzed; we may not have visibility of the full super-class
> > hierarchy. Therefore to ensure consistency, only the direct
> > annotations on the component class are considered.
> >
> > If we also considered annotations on the super-classes, then this
> > would sometimes work but sometimes NOT work, depending on a fairly
> > arbitrary and poorly-controlled aspect of the build environment.
> >
> > Neil
> >
> > On Tue, Apr 30, 2013 at 7:42 PM, lessonz <le...@gmail.com>
> wrote:
> >> My understanding is it has nothing to do with iPOJO and everything to do
> >> with how Java handles annotations.
> >> On Apr 30, 2013 12:34 PM, "Michiel Vermandel" <mv...@yahoo.com>
> wrote:
> >>
> >>> Thanks
> >>> Would be nice if it could.
> >>> But I'm quite new to iPOJO. Maybe I can't yet grasp the reason for
> this...
> >>>
> >>>
> >>> -----------------
> >>> http://www.codessentials.com - Your essential software, for free!
> >>> Follow us at http://twitter.com/#!/Codessentials
> >>>
> >>>
> >>> ________________________________
> >>> From: lessonz <le...@gmail.com>
> >>> To: users@felix.apache.org; Michiel Vermandel <mv...@yahoo.com>
> >>> Sent: Tuesday, April 30, 2013 6:44 PM
> >>> Subject: Re: [iPOJO] Usage of @Requires in superclass
> >>>
> >>>
> >>> It's been my experience this does not work.
> >>>
> >>>
> >>> On Tue, Apr 30, 2013 at 6:12 AM, Michiel Vermandel <mvermand@yahoo.com
> >>>> wrote:
> >>>
> >>>> Hello,
> >>>>
> >>>> Can I use @Requires on a field of a (Abstract) class that will be
> >>> extended?
> >>>> Of course only the extending classes will be instantiated.
> >>>>
> >>>> Thank you
> >>>>
> >>>>
> >>>> -----------------
> >>>> http://www.codessentials.com - Your essential software, for free!
> >>>> Follow us at http://twitter.com/#!/Codessentials
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@felix.apache.org
> > For additional commands, e-mail: users-help@felix.apache.org
> >
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@felix.apache.org
> For additional commands, e-mail: users-help@felix.apache.org
>
>
Re: [iPOJO] Usage of @Requires in superclass
Posted by Clement Escoffier <cl...@gmail.com>.
Hi,
As Neil said, the current annotation processing would too brittle if we try to analyze parent classes.
So unfortunately, no, @Requires from parent classes are not processed.
However we have plan to implement this support in iPOJO 2.x (work already started).
Regards,
Clement
On 30 avr. 2013, at 22:43, Neil Bartlett <nj...@gmail.com> wrote:
> I'm speculating here, but I imagine iPOJO doesn't handle this for the
> same reason that bnd doesn't. Both analyze the annotations at
> build-time to generate the runtime metadata (and in iPOJO's case,
> injected bytecodes). At build time, the only class we can guarantee to
> have visibility of is the actual component class that is being
> analyzed; we may not have visibility of the full super-class
> hierarchy. Therefore to ensure consistency, only the direct
> annotations on the component class are considered.
>
> If we also considered annotations on the super-classes, then this
> would sometimes work but sometimes NOT work, depending on a fairly
> arbitrary and poorly-controlled aspect of the build environment.
>
> Neil
>
> On Tue, Apr 30, 2013 at 7:42 PM, lessonz <le...@gmail.com> wrote:
>> My understanding is it has nothing to do with iPOJO and everything to do
>> with how Java handles annotations.
>> On Apr 30, 2013 12:34 PM, "Michiel Vermandel" <mv...@yahoo.com> wrote:
>>
>>> Thanks
>>> Would be nice if it could.
>>> But I'm quite new to iPOJO. Maybe I can't yet grasp the reason for this...
>>>
>>>
>>> -----------------
>>> http://www.codessentials.com - Your essential software, for free!
>>> Follow us at http://twitter.com/#!/Codessentials
>>>
>>>
>>> ________________________________
>>> From: lessonz <le...@gmail.com>
>>> To: users@felix.apache.org; Michiel Vermandel <mv...@yahoo.com>
>>> Sent: Tuesday, April 30, 2013 6:44 PM
>>> Subject: Re: [iPOJO] Usage of @Requires in superclass
>>>
>>>
>>> It's been my experience this does not work.
>>>
>>>
>>> On Tue, Apr 30, 2013 at 6:12 AM, Michiel Vermandel <mvermand@yahoo.com
>>>> wrote:
>>>
>>>> Hello,
>>>>
>>>> Can I use @Requires on a field of a (Abstract) class that will be
>>> extended?
>>>> Of course only the extending classes will be instantiated.
>>>>
>>>> Thank you
>>>>
>>>>
>>>> -----------------
>>>> http://www.codessentials.com - Your essential software, for free!
>>>> Follow us at http://twitter.com/#!/Codessentials
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@felix.apache.org
> For additional commands, e-mail: users-help@felix.apache.org
>
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@felix.apache.org
For additional commands, e-mail: users-help@felix.apache.org
Re: [iPOJO] Usage of @Requires in superclass
Posted by Neil Bartlett <nj...@gmail.com>.
I'm speculating here, but I imagine iPOJO doesn't handle this for the
same reason that bnd doesn't. Both analyze the annotations at
build-time to generate the runtime metadata (and in iPOJO's case,
injected bytecodes). At build time, the only class we can guarantee to
have visibility of is the actual component class that is being
analyzed; we may not have visibility of the full super-class
hierarchy. Therefore to ensure consistency, only the direct
annotations on the component class are considered.
If we also considered annotations on the super-classes, then this
would sometimes work but sometimes NOT work, depending on a fairly
arbitrary and poorly-controlled aspect of the build environment.
Neil
On Tue, Apr 30, 2013 at 7:42 PM, lessonz <le...@gmail.com> wrote:
> My understanding is it has nothing to do with iPOJO and everything to do
> with how Java handles annotations.
> On Apr 30, 2013 12:34 PM, "Michiel Vermandel" <mv...@yahoo.com> wrote:
>
>> Thanks
>> Would be nice if it could.
>> But I'm quite new to iPOJO. Maybe I can't yet grasp the reason for this...
>>
>>
>> -----------------
>> http://www.codessentials.com - Your essential software, for free!
>> Follow us at http://twitter.com/#!/Codessentials
>>
>>
>> ________________________________
>> From: lessonz <le...@gmail.com>
>> To: users@felix.apache.org; Michiel Vermandel <mv...@yahoo.com>
>> Sent: Tuesday, April 30, 2013 6:44 PM
>> Subject: Re: [iPOJO] Usage of @Requires in superclass
>>
>>
>> It's been my experience this does not work.
>>
>>
>> On Tue, Apr 30, 2013 at 6:12 AM, Michiel Vermandel <mvermand@yahoo.com
>> >wrote:
>>
>> > Hello,
>> >
>> > Can I use @Requires on a field of a (Abstract) class that will be
>> extended?
>> > Of course only the extending classes will be instantiated.
>> >
>> > Thank you
>> >
>> >
>> > -----------------
>> > http://www.codessentials.com - Your essential software, for free!
>> > Follow us at http://twitter.com/#!/Codessentials
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@felix.apache.org
For additional commands, e-mail: users-help@felix.apache.org
Re: [iPOJO] Usage of @Requires in superclass
Posted by lessonz <le...@gmail.com>.
My understanding is it has nothing to do with iPOJO and everything to do
with how Java handles annotations.
On Apr 30, 2013 12:34 PM, "Michiel Vermandel" <mv...@yahoo.com> wrote:
> Thanks
> Would be nice if it could.
> But I'm quite new to iPOJO. Maybe I can't yet grasp the reason for this...
>
>
> -----------------
> http://www.codessentials.com - Your essential software, for free!
> Follow us at http://twitter.com/#!/Codessentials
>
>
> ________________________________
> From: lessonz <le...@gmail.com>
> To: users@felix.apache.org; Michiel Vermandel <mv...@yahoo.com>
> Sent: Tuesday, April 30, 2013 6:44 PM
> Subject: Re: [iPOJO] Usage of @Requires in superclass
>
>
> It's been my experience this does not work.
>
>
> On Tue, Apr 30, 2013 at 6:12 AM, Michiel Vermandel <mvermand@yahoo.com
> >wrote:
>
> > Hello,
> >
> > Can I use @Requires on a field of a (Abstract) class that will be
> extended?
> > Of course only the extending classes will be instantiated.
> >
> > Thank you
> >
> >
> > -----------------
> > http://www.codessentials.com - Your essential software, for free!
> > Follow us at http://twitter.com/#!/Codessentials
Re: [iPOJO] Usage of @Requires in superclass
Posted by Michiel Vermandel <mv...@yahoo.com>.
Thanks
Would be nice if it could.
But I'm quite new to iPOJO. Maybe I can't yet grasp the reason for this...
-----------------
http://www.codessentials.com - Your essential software, for free!
Follow us at http://twitter.com/#!/Codessentials
________________________________
From: lessonz <le...@gmail.com>
To: users@felix.apache.org; Michiel Vermandel <mv...@yahoo.com>
Sent: Tuesday, April 30, 2013 6:44 PM
Subject: Re: [iPOJO] Usage of @Requires in superclass
It's been my experience this does not work.
On Tue, Apr 30, 2013 at 6:12 AM, Michiel Vermandel <mv...@yahoo.com>wrote:
> Hello,
>
> Can I use @Requires on a field of a (Abstract) class that will be extended?
> Of course only the extending classes will be instantiated.
>
> Thank you
>
>
> -----------------
> http://www.codessentials.com - Your essential software, for free!
> Follow us at http://twitter.com/#!/Codessentials
Re: [iPOJO] Usage of @Requires in superclass
Posted by lessonz <le...@gmail.com>.
It's been my experience this does not work.
On Tue, Apr 30, 2013 at 6:12 AM, Michiel Vermandel <mv...@yahoo.com>wrote:
> Hello,
>
> Can I use @Requires on a field of a (Abstract) class that will be extended?
> Of course only the extending classes will be instantiated.
>
> Thank you
>
>
> -----------------
> http://www.codessentials.com - Your essential software, for free!
> Follow us at http://twitter.com/#!/Codessentials