[Development] Proposal: virtual method of QtNetwork interfaces

[Yang Fan]

Hi list,

I'm writing a network program which runs on MS Windows, Linux and Mac OS X.
All things look good but it seems that the network performance needs
improving. I see the QtNetwork module especially the QNetworkAccessManager
class which I'm mainly using in my program  is implemented using cross
platform select model, this model is designed for easy using but not for
good performance such as low latency and high throughout, every Operating
System provide a special socket/IO model to let applications have good
performance, for example, MS Windows provides IO completion port model,
Linux (>= 2.6 kernel) provides epoll/AIO model, BSD/Mac OSX provide kqueue
etc. So I want to  provide my customized NetworkAccessManager class, but I
don't want to modify the Qt's source code since I will use Boost.asio
library which depends on Boost library, a very big library that is not
suitable to include in Qt as a 3rd party library. I wonder if your guys
could modify the QNetworkAccessManager's method declaration(get, post,
put...), make them be virtual, so that I can derive a subclass and modify
the implementation. The reason I need a subclass of QNetworkAccessManager
not a new class is, I also want my class could be set as the network engine
of QtWebkit.
Feel free to reply if you have any other good idea.

Regards,
Fan Yang
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