Hi Krzysztof
I was thinking your proxy/interceptor would hide all the async details
(such as IAsyncResult) from the client.
It would set up the AsyncCallback internally and call EndFoo to get
the result, and then pass it on to the client.
Exceptions could be trapped and handled as:
proxy
.BeginInvoke(p => p.GetSize(str))
.EndInvoke(size => Write(size))
.Except(x => Log(x))
Ajai
On May 11, 2:07 am, "Krzysztof Kozmic" <[email protected]> wrote:
> Ajai,
>
> Yeah, I've been thinking of doing something along the lines you
> proposed, but this approach has serious flaws.
> Who calls the actual EndFoo methods? What happends when it throws?
>
> Krzysztof
>
> >>> [email protected] 2009-05-09 16:06 >>>
>
> From your Prepare snippet, looks like the model for the client code is
> still callback based.
>
> How about using a BeginInvoke extension method?
>
> proxy
> .BeginInvoke(p => p.GetSize(str))
> .EndInvoke(size => Write(size));
>
> This calling pattern sets up some context for your proxy/interceptor
> directing it to call BeginGetSize instead of GetSize.
>
> The client then can control if the call is going to be synchronous or
> asynchronous based on its need.
>
> You might find a coroutine approach such as F# async or
> myhttp://www.codeplex.com/EasyAsyncinteresting too.
>
> Cheers
>
> Ajai
>
> On May 6, 2:47 pm, Krzysztof Ko*mic <[email protected]>
> wrote:> I'm working on adding to WCF Facility support for async calls from
> > client side (similar to what can be done with SvcUtil-generated
> > proxies), when using channelfactory and intereface contract only.
> > Something like What Ayende wrote about
>
> here:http://ayende.com/Blog/archive/2008/03/29/WCF-Async-without-proxies.aspx
>
>
>
> > but without having to write IAsyncBus
>
> > I have very rough (but working) implementation.
>
> > But...
>
> > given we don't have an actual async methods to call, we have to have
> an
> > alternative syntax (well, at least until C# 4.0 and IDynamicObject,
> but
> > that's another story)http://paste2.org/p/198506here'swhat I came up
> with.
> > I encourage you to discussion about it. If you have alternative,
> better
> > ideas, you can show it here:http://paste2.org/followup/198506
>
> > Thanks,
>
> > Krzysztof
>
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