Yes, although the logic is more complex, I can have the bound function callback
into the shared object to retrieve the data that I wanted to pass to the bound
function.
For my application, I have a UIServer object (1 per session) and a StatusServer
(singleton), which relays status messages between sessions.
UIServer ctor calls
StatusServer::connect( this,
wApp->bind( boost::bind( &UIServer::notifyStatusEvent, this) ))
StatusServer::postStatusEvent() will save a copy of the event in a per-session
queue.
and calls WServer::post(sessionid, callback), which indirectly calls
UIServer::notifyStatusEvent()
UIServer::notifyStatusEvent() calls
StatusServer::getEvent() to retrieve the event, and call
UIServer::processStatusEvent() to handle the StatusEvent.
It would be quite helpful if <Wt_src>/examples/simplechat used
WApplication::bind().
I appreciate any examples, but examples that correctly handle real-world
situations, like browser sessions being closed are MUCH more useful. As far as
I can tell, because simplechat doesn't use WApplication::bind(), it may not
safely handle browser sessions that are closed.
If I get the chance, I'll submit a rewritten simplechat example that uses
WApplication::bind(), but as they say "It won't be pretty!"
On Nov 13, 2012, at 4:44 AM, Koen Deforche wrote:
> Hey Joseph, Rob,
>
> I guess you are both indicating a limitation: WApplication::bind()
> essentially returns a function without arguments, and thus all
> arguments already have to be bound before the call, which makes it
> useless when you want to pass on information from the external source.
>
> As a workaround, perhaps you can rather than 'push' new information,
> make the bound function 'poll' the information from the shared object
> ?
>
> I believe it should be possible to make WApplication::bind() work
> properly with any kind of function, including functions with free
> parameters -- although that requires a bit of digging into the
> meta-function possiblities of boost-ified c++...
>
> In any case, using WApplication::bind() later on is not very useful --
> it needs to happen with the session lock and with the objects bound
> guaranteed to be alive at the moment of calling WApplication::bind().
>
> Regards,
> koen
>
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