[Vortex] About multiple async RPC call using same callback function

[Francis Brosnan Blázquez]

> Hello. All.

Hi Scott,

>     I am writing an online teaching application. 

Nice,

> The problem puzzle me now is in my application, each time an classroom
> is created, it needs to use rpc call to load data from server which
> returns a big structure. I am using C++. Now if I have 3 classrooms
> start up at same time. Each classroom will have its own rpc channel.
> And it will invoke rpc call from its own channel async. But when the
> result return, the callback function is same. I checked document,
> there is no way to know which channel this callback is for. How do I
> know from which channel I invoke the rpc call so I can find who invoke
> the rpc call?

You have several methods but depends on your design. For example, you
can use the following to "mark" each channel assigned to a room:

  vortex_channel_set_data (channel, "classroomid", PTR_TO_INT(1));

...then you can use the following to know which room it is:

  classroom_id = PTR_TO_INT (vortex_channel_get_data (channel, "classrommid"));

However, I don't like too much that method because it binds statically
channels to rooms. If you can, change your rpc payload content to
include the class room id, you can use any channel to query/operate over
any class room.

Cheers!

> Thanks.
> Regards.
> Scott
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-- 
Francis Brosnan Blázquez <francis at aspl.es>
ASPL
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