fadams wrote
> On 08/10/14 18:49, Rafael Schloming wrote:
>> Actually I think it is possible to do this with messenger now that
>> dominic's patches are in. You can access the link associated with any
>> given
>> address using pn_messenger_get_link() and configure it however you want
>> to.
>>
>> --Rafael
>>
> Oooh now there's a thought Rafi, I was wondering if Dominic's patches
> might open up that possibility but I didn't really know enough about the
> link API to be sure.
>
> Don't suppose that you have any code snippets that could help out?
>
> Presumably the main call is the recently added
>
> pn_messenger_get_link(pn_messenger_t *messenger,
> const char *address, bool
> sender)
>
>
> I'm not clear at which point you'd need to "fiddle" with it, so for
> example I'd normally do a subscribe, so would I first do a subscribe and
> then immediately do a pn_messenger_get_link using the same address as
> the source used for the subscription?
>
> I'm afraid I'm a bit ignorant in all this 'cause I'd have assumed that
> you'd need to specify things like filters/selectors before the link
> attach occurs, but I wasn't clear that you had control of that in
> Messenger, as I say all I've done has been fairly basic things like
> subscribe followed by a check on incoming followed by a get.
>
> Some code (or even pseudocode) would be really useful.
>
> Frase
So for me, pn_messenger_get_link was only really intended for interrogating
the status of a link (e.g., checking if its ACTIVE or CLOSED) or
(post-attach) for modifying the time-to-live before closing it.
So e.g.,
pn_link_t* link =
pn_messenger_get_link(messenger, address, false); // get recv link
pn_terminus_set_timeout(pn_link_target(link), ttl);
pn_link_close(link);
Afaik the interpretation of AMQP filters is entirely broker specific? Either
way I expect that the broker will expect it be sent as part of the initial
@attach. You *could* try modifying the pn_data_t returned by
pn_terminus_filter and then doing a pn_link_close immediately followed by a
pn_link_open.
Alternatively extend pn_messenger_subscribe to allow you to specify a filter
up-front before the first attach.
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