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From "Alen Ribic" <al...@mweb.co.za>
Subject Re: JDO Enhancer Idea from JBoss
Date Wed, 13 Aug 2003 11:03:49 GMT
Javassist might be another lib to take a look at for bytecode level
manipulation.
http://www.csg.is.titech.ac.jp/~chiba/javassist/

--Alen


----- Original Message -----
From: "Brian McCallister" <mccallister@forthillcompany.com>
To: "OJB Developers List" <ojb-dev@db.apache.org>
Sent: Tuesday, August 12, 2003 4:25 PM
Subject: Re: JDO Enhancer Idea from JBoss


> Tilt, I misunderstood soemthing about Aspectwerkz - it *does* do
> runtime bytecode enhancement! Need to look into this, even if we can't
> use it, the techniques it uses for enhancement could provide the
> insight into how to do what we want.
>
> -Brian
>
> On Tuesday, August 12, 2003, at 10:22 AM, Brian McCallister wrote:
>
> > I agree something like this would rock, but without having access to
> > pre-loaded bytecode you have to use some tricks that I don't think
> > Java actually supports (hmm, we could port all of J2EE to Ruby...)
> > such as wrapping a particular instance in a runtime subclass of itself
> > in situ (easy in Ruby, impossible in Java).
> >
> > One thing that keeps coming to mind is how Aspect-ish JDO is, how
> > bytecode enhancement is the preferred means of implementing it, and
> > Aspectwerkz, ( http://aspectwerkz.codehaus.org/ ) an aspect tool that
> > works via bytecode enhancement, as compared to AspectJ which is
> > sourcecode enhancement. It might be an easy way to build a bytecode
> > enhancer, though as Aspectwerkz is LGPL, we wouldn't be able to
> > actually use it to make an official bytecode enhancer for OJB
> > (unfortunately).
> >
> > Will think about how to do runtime bytecode enhancement, but without
> > control over the classloader, I don't think it can be done.
> >
> > -Brian
> >
> > On Tuesday, August 12, 2003, at 09:32 AM, Alen Ribic wrote:
> >
> >> Funny enough, I just had a discussion at our JUG about requirement for
> >> making things simplified for developers.
> >> And that was my main example. JBossDO deploy-time enhancer that I
> >> noticed
> >> recently. Very simple but very effective. Running a good facade for
> >> programmer interface to underling subsystems is very important from
> >> my point
> >> of view.
> >>
> >> I vote +1 for something like this for sure.
> >>
> >> 2c from me ;)
> >> --Alen
> >>
> >>
> >> ----- Original Message -----
> >> From: "Brian McCallister" <mccallister@forthillcompany.com>
> >> To: "OJB Developers List" <ojb-dev@db.apache.org>
> >> Sent: Tuesday, August 12, 2003 3:19 PM
> >> Subject: JDO Enhancer Idea from JBoss
> >>
> >>
> >>> JBoss did something very interesting with their recent JDO
> >>> announcement/release. They made it possible to do the enhancement at
> >>> deployment time *by the container*. Apparently the container enhances
> >>> the classes at deployment time if they are specified in the
> >>> descriptor
> >>> to be JDO's.
> >>>
> >>> I haven't looked into the details, but this seems like an awfully
> >>> convenient way to do it. As OJB doesn't provide a managed environment
> >>> and have control over classloaders we couldn't do the same thing, but
> >>> is quit interesting to see how they did it.
> >>>
> >>> -Brian
> >>>
> >>>
> >>>
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> >>
> >>
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> >>
> >
> >
> >
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> >
> >
>
>
>
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