Yes, there is a post compilation step called weaving, if you use
AspectJ compiler (ajc). Actually ajc behaves like an ordinary
compiler, you don't need to setup a post compilation step, ajc does
everything, it compiles and weaves your code.
There is another kind of class instrumenting called Load Time Weaving
(LTW), which modifies the classes when they are loaded by the VM, and
you can use normal compilation.
2005/12/14, Igor Vaynberg <[EMAIL PROTECTED]>:
> what do you mean its done at compile time? there is a post compilation step?
>
> -Igor
>
>
>
> On 12/13/05, Eduardo Rocha < [EMAIL PROTECTED]> wrote:
> >
> > The binding is done at compile time, so those fields which are not
> > annotated behaves exactly the same way.
> >
> > I had written before an aspect that injected at construction and at
> > deserialization, actually I don't remember why I switched to this
> > style, maybe because is much simpler.
> >
> > 2005/12/13, Igor Vaynberg <[EMAIL PROTECTED]>:
> > > but even with @Before("get(@SpringBean * *)") you are still intercepting
> > > every field access, and using reflection to check if the SpringBean
> > > annotation is present. i am no aop expert, but that seems like overkill
> to
> > > me. i guess the proxy solution is really a cache to something like this.
> you
> > > do the lookup once, when you create the object, and then trade a small
> hit
> > > on your session size for cpu speed.
> > >
> > > -Igor
> > >
> > >
> > >
> > > On 12/13/05, Eduardo Rocha <[EMAIL PROTECTED]> wrote:
> > > >
> > > > Yes, intercepting every field access could hit performance, but I
> > > > don't think can be a very serious issue:
> > > >
> > > > @Before("get(@SpringBean * *)")
> > > > public void matchAnnotatedFields(JoinPoint thisJoinPoint) {
> > > >
> > > > Concerning transient fields, there is a declare error on annotated
> > > > fields which are not transient:
> > > >
> > > >
> > >
> @DeclareError("get(@wicket.contrib.spring.aspectj.SpringBean
> > > !transient * *)")
> > > > public static final String MUST_BE_TRANSIENT = "SpringBean annotated "
> > > > + "field must be transient.";
> > > >
> > > > 2005/12/13, Igor Vaynberg < [EMAIL PROTECTED]>:
> > > > > that should work if you declare your fields transient. but what is
> the
> > > > > performance hit? youd have to intercept every field access no?
> > > > >
> > > > > -Igor
> > > > >
> > > > >
> > > > >
> > > > > On 12/13/05, Eduardo Rocha <[EMAIL PROTECTED] > wrote:
> > > > > >
> > > > > > The semantic is "any time an annotated field is read, it is
> checked to
> > > > > > see if it is null, and if it is, instantiate it". I think this is
> OK
> > > > > > with this code, what do you think?
> > > > > >
> > > > > > 2005/12/13, Igor Vaynberg < [EMAIL PROTECTED]>:
> > > > > > > hmm
> > > > > > > what about stuff like this:
> > > > > > >
> > > > > > > UserDetachableModel { long userid; private UserService svc;
> > > transient
> > > > > User
> > > > > > > user; void attach() { user= svc.load(userid); }
> > > > > > >
> > > > > > > new DetachableModel(10, userService); where userService is a
> proxy
> > > to
> > > > > the
> > > > > > > user service bean.
> > > > > > >
> > > > > > > having these proxies means i can pass them into any object i
> want
> > > such
> > > > > as a
> > > > > > > detachable model or a data provider, and when those things are
> > > > > > > serealized/deserialized there is no problem.
> > > > > > >
> > > > > > > -Igor
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > On 12/13/05, Eduardo Rocha < [EMAIL PROTECTED]> wrote:
> > > > > > > >
> > > > > > > > Igor,
> > > > > > > >
> > > > > > > > As I said in another post, proxies are not needed with
> AspectJ.
> > > > > > > >
> > > > > > > > 2005/12/13, Igor Vaynberg < [EMAIL PROTECTED]>:
> > > > > > > > > have a look here
> > > > > > > > >
> > > > > > > > >
> > > http://www.wicket-wiki.org.uk/wiki/index.php/Spring
> > > > > > > > >
> > > > > > > > > this explains both integration strategies and why the
> proxies
> > > are
> > > > > > > needed.
> > > > > > > > >
> > > > > > > > > -Igor
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > On 12/13/05, Eduardo Rocha < [EMAIL PROTECTED]>
> wrote:
> > > > > > > > > > You are right. I will look at the current implementation
> to
> > > see if
> > > > > it
> > > > > > > > > > works like it is working for me.
> > > > > > > > > >
> > > > > > > > > > 2005/12/13, Igor Vaynberg < [EMAIL PROTECTED]>:
> > > > > > > > > > > automatic injection is not the problem. the problem is
> that
> > > > > injected
> > > > > > > > > > > dependencies cannot be serialized, thus the whole proxy
> > > > > approach.
> > > > > > > > > > >
> > > > > > > > > > > -Igor
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > On 12/13/05, Eduardo Rocha < [EMAIL PROTECTED] >
> > > wrote:
> > > > > > > > > > > >
> > > > > > > > > > > > Spring 2.0 will bring support to objects which are not
> > > > > > > instantiated by
> > > > > > > > > > > > the container:
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > >
> > > > > > >
> > > > >
> > >
> http://www.theserverside.com/news/thread.tss?thread_id=38047
> > > > > > > > > > > >
> > > > > > > > > > > > Actually it is very similar with what I was doing,
> except
> > > that
> > > > > the
> > > > > > > > > > > > article uses a prototype (template) object in
> > > configuration,
> > > > > while
> > > > > > > I
> > > > > > > > > > > > am annotating each field, like wicket-contrib-spring
> does.
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > >
> > > > >
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