Re: How AsyncCallback works? - RPC services

Here's how it works :

1. Javascript code uses XmlHttpRequest API to start an AJAX call. 
2. Browser intercepts XmlHttpRequest method invocation
3. Browser makes a http connection to the server in a separate thread. This way, the main user interface thread is not blocked.
4. When the http response is available, the browser invokes the AJAX callback as part of the main user interface thread.

Key takeaways - 

• There is no polling or IP based tracking.
• The underlying HTTP call is always synchronous.
• The browser invokes the callback only when the response is available, which is why we say "AJAX is asynchronous"

--Sri

On 26 February 2011 22:59, dreamer <venugopal.vasireddy@gmail.com> wrote:

Thanks Jeff.these are programming details. But how AJAX is
implemented, like is it polling or true call back, using peer to peer
techniques, such details
not available.

On Feb 26, 9:14 am, Jeff Schwartz <jefftschwa...@gmail.com> wrote:
> I googled & found the following:
>
> Ajax intro:http://www.javalobby.org/articles/ajax/
>
> Google RPC doc:http://code.google.com/webtoolkit/doc/latest/tutorial/RPC.html
>

> On Sat, Feb 26, 2011 at 12:01 PM, dreamer <venugopal.vasire...@gmail.com>wrote:

>
>
>
>
>
>
>
>
>
>
>
> > True. Not found this kind of details. May be some gwt contributor
> > should be having  good Idea about these.
>
> > On Feb 25, 6:53 am, Jeff Schwartz <jefftschwa...@gmail.com> wrote:
> > > RPC uses Ajax so understanding how Ajax works will answer all your
> > > questions.
>
> > > On Fri, Feb 25, 2011 at 9:49 AM, dreamer <venugopal.vasire...@gmail.com
> > >wrote:
>
> > > > Hi,
>
> > > > Not sure how the AsyncCallback works in GWT. Could somebody share
> > > > please?
>
> > > > 1) Will it create a thread and polls the server ?
> > > >         or
> > > > 2) Will servers register's client IP and when result is available
> > > > makes a fresh TCP/IP connection to client
> > > >    and calls client.
>
> > > >    Within this call back, will server calls a method on skeleton
> > > > (server side stubs) for remote call ?
> > > >       or
> > > >    It just makes a tcp call and client handles calling the Async
> > > > method ?
>
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> > > --
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>
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