Re: [cpp-netlib-devel] Can cpp_netlib perform asynchronous concurrent requests?

[Dean M. B. <mik...@gm...>]

On Sat, Nov 13, 2010 at 3:32 AM, qjmann <sou...@gm...> wrote:
> Documentation contains example HTTP client, but I see it works in blocking
> mode:
>
> http_client::response response = client.get(request)
>
> - this call will stop program execution while waiting for server's response.

Not if http_client is a typedef like:

  typedef boost::network::http::basic_client<
    boost::network::http::tags::http_async_8bit_udp_resolve
    , 1, 0> http_client;

> Is it possible to perform multiple concurrent requests with cpp_netlib
> without spawning multiple threads, as it can be done with ASIO asynchronous
> sockets?

Yes, use the asynchronous tags for the http_client. This will use
futures underneath.

In a later release there will be a change in the interface for an
asynchronous HTTP client that will take in a function to handle
incoming data from a request -- most probably will follow the same
interface that the async HTTP server in 0.8-devel will, I still
haven't decided yet.

>
> 1) Create single io_service object
> 2) Create and initialize client objects set (all attached to io_service
> object just created)
> 3) Call io_service.poll()
> 4) Check client objects for responses received
> 5) If some responses has not been received yet, then goto step 3
>

No need for polling really, a callback mechanism or the current
futures-based implementation should suffice for most cases.

HTH

-- 
Dean Michael Berris
deanberris.com