[jira] [Commented] (PROTON-46) No way to get at a message's subscription using pn_messenger_t and pn_message_t APIs

["William Henry (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PROTON-46?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13480339#comment-13480339 ] 

William Henry commented on PROTON-46:
-------------------------------------

API changes in Messenger to allow subscription tracking:

(Pseudo code)

Messenger
    subscription* subscribe(addr);
    void               unsubscribe(subscription*);
    void               set_context(subscription*, void*);
    void*              get_context(subscription*);

Message
    subscription* get_subscription(message*);
                
> 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
>            Priority: Blocker
>              Labels: api
>
> 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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