Re: [Cppcms-users] How to fullfill ajax-call from different thread?

[eric m. <mid...@gm...>]

Hi Artyom,

Thanks for clarifying.

To answer your question: I have a thread that controls a motor and another
thread that services a webinterface. I send a command from the webthread to
the motorthread via an ajax-call and that has to be asynchronous otherwise
it will not respond to input from the user. Meanwhile the motorthread
starts doing its thing and that can take a while but it has to report back
status to the user. I now use two asynchronous ajax-calls: one for
receiving the status from the motorthread that waits for it and another one
to send the command to the motorthread that returns immediately. When I
asked the question my intention was to report back with using the second
ajax-call for receiving the status from the motorthread.

There's another thing I'm wondering about. Given the ticker_example: is it
possible to have two independent streams under the same endpoint, say
/ticker/stream1 and /ticker/stream2 and if yes how would I do that?

Kind regards,
Eric

On Tue, Feb 16, 2016 at 2:02 AM, Artyom Beilis <art...@gm...>
wrote:

> > Taking the json_rpc_chat example as a starting point, is it possible to
> > respond to get() from another thread? Let me elaborate a bit on that.
> >
> > In the chat example the get activates a callback that is called by a post
> > from the browser via the broadcast method. Is it possible to let this
> > callback be called by a different server-thread that is performing a task
> > and comes back with the result to be returned to the original get
> activated
> > by the browser?
> >
> > To put it differently, is it possible to interact with the
> json_rpc_server
> > and fullfill callbacks from outside?
> >
> > Reason for asking is that I'm using ajax-calls to perform tasks on the
> > server but I do not want the browser to hang up on it while waiting for
> the
> > result.
> >
> > Kind regards,
> > Eric
> >
>
>
> To be honest I don't clearly understand what are you trying to do.
>
> You have two types of applications:
>
> 1. Synchronous - running in threads and returning result immediately
> 2. Asynchronous - running in a single event loop - that can postpone
> the response or keep long running open connections if needed.
>
> You can "send" messages from synchronous apps (or what ever thread)
> to asynchronous apps by posting callbacks to the main
> event loop - i.e. service().post(some_function) such that this
> "some_function" would be executed in the event loop and can interact
> with the async apps.
>
> So for example you can have a generic thread that posts every minute a
> message to the chat from some thread
> using this callback method.
>
>
> Artyom
>
>
>
> >
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-- 
Groetjes,
Eric

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