Rafael H. Schloming resolved PROTON-46.

    Resolution: Fixed
      Assignee: Rafael H. Schloming
> No way to get at a message's subscription using pn_messenger_t and 
> pn_message_t APIs 
> -------------------------------------------------------------------------------------
>                 Key: PROTON-46
>                 URL: https://issues.apache.org/jira/browse/PROTON-46
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-c
>            Reporter: William Henry
>            Assignee: Rafael H. Schloming
>            Priority: Blocker
>              Labels: api
>             Fix For: 0.2
> Motivation: 
> Integrate with another messaging API.  That other API may handle incoming 
> messages differently based on their notion of a subscription.  There is no 
> way to know which subscription a message came in on when using the messenger 
> API.
> It would be handier if I could just get something back form the API to help 
> me track/lookup.
> What would be nice is two API additions. 
> int pn_messenger_context_subscribe(pn_messenger_t *messenger, const char 
> *source, void* context);
> int pn_messenger_context_get(pn_messenger_t *messenger, pn_message_t *msg, 
> void* context);
> The get would return the context for that message based on the subscription.
> Alternatively what would be better is:
> int pn_messenger_subscribe(pn_messenger_t *messenger, const char *source,
> void* context);
> void *pn_message_subscribe_context(pn_message_t *msg);
> For C we can just leave it as NULL if we don't care about it and in the
> idiomatic APIs we can turn it into an optional argument.
> An incoming message would have it's subscription context stored with it when 
> it arrives.  No extra lookup required on the: void 
> *pn_message_subscribe_context(pn_message_t *msg);

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