Re: [Aspectsharp-users] IInvocation.Proxy and IInvocation.InvocationTarget

[Deyan P. <de...@ho...>]

Hi,

Obviously my reply from yesterday with an attachment was blocked. So I send
another one, this time I have placed my test project on the web:


http://www20.brinkster.com/deyanp/dynproxy/DynamicProxyAvalonTest.zip

10x, hammett, and sorry to bother you with this.

Br,
Deyan

----- Original Message ----- 
From: "hammett" <ha...@uo...>
To: <asp...@li...>
Sent: Wednesday, October 27, 2004 8:15 PM
Subject: Re: [Aspectsharp-users] IInvocation.Proxy and
IInvocation.InvocationTarget


> Hello Deyan,
>
> > I have been playing with the new IInvocation, and I noticed that both
> > properties IInvocation.Proxy and IInvocation.InvocationTarget are the
> > same.
> > What's there meaning, btw?
>
> The target means: when I invoke proceed, which object will receive the
> execution; and the proxy is the proxy itself. When proxying a class, both
> values will be the same. When intercepting interfaces (using
> ProxyGenerator.CreateProxy) then the values will be different.
>
> > What is bothering me is that there is no way to substitute the real
object
> > in the PreProcess method of my Interceptor, which is a part of the
object
> > lazy-loading process...
>
> Well, this is easy to fix. We can make the InvocationTarget writable, but
> then the Proceed in the SameClassInvocation must be changed to something
> like:
>
>   public override object Proceed(params object[] args)
>   {
>     object value = null;
>     if (TargetInvocation == Proxy)
>     {
>       value = call.Call( args );
>     }
>     else
>     {
>       value = Method.Invoke( InvocationTarget, args );
>     }
>    return value;
>   }
>
> Because there is no wasy to use the delegate to invoke the method
somewhere
> else. I could even generate two different delegates: one to invoke the
> base() and one to invoke anotherobject() but in this case I must know the
> Type of the anotherobject during the object generation, something like:
>
> private void callback_1(int x)
> {
>   base.DoSomething(x);
> }
>
> private void otherobjectcallback(int x)
> {
>   // This is generated by
>   // gen.Emit( OpCodes.callvirt, typeof(target).GetMethod("DoSomething",
new
> type[] { typeof(int) } );
>   target.DoSomething(x);
> }
>
>
> > I see that NHibernate also has this problem, as it
> > retrieves the real object from the db and delegates (using runtime
> > reflection) the calls to it. I would like to execute the methods on the
> > real
> > object without runtime reflection, which means that either I can
substitte
> > the real object (perhaps this is the IInvocation.InvocationTarget which
> > has
> > only a getter) - this I think is not possible, or populate the
properties
> > of
> > the proxy from the db at runtime, and then take advantage of the Dynamic
> > Proxy new calling infrastructure.
>
> Can you expose your code somewhere so we can see exactly the problem?
> It will be easier to picture the solution...
>
> --
> Cheers,
> hammett
> http://www.digitalcraftsmen.com.br/~hammett
>
>
>
>
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