[jira] [Comment Edited] (PROTON-278) Messenger - allow the application to control the use of the message reply-to field.

["Ted Ross (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PROTON-278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616324#comment-13616324 ] 

Ted Ross edited comment on PROTON-278 at 4/3/13 3:00 PM:
---------------------------------------------------------

An alternative API is to add a method on the pn_message_t:

    pn_message_expect_reply(pn_message_t *msg);

This removes the need to sequence the operation after setting the "to" address.  It simply annotates the message as needing a functional reply-to.  When the message is subsequently sent, messenger can create or re-use the necessary subscriptions and set the message's reply-to field.

                
      was (Author: tedross):
    An alternative API is to add a method on the pn_message_t:

    pn_message_expect_reply(pn_message_t *msg);

This removes the need to sequence the operation after setting the "to" address.  It simply annotates the message as needing a functional reply-to.  When the messages is subsequently sent, messenger can create or re-use the necessary subscriptions and set the message's reply-to field.

                  
> Messenger - allow the application to control the use of the message reply-to field.
> -----------------------------------------------------------------------------------
>
>                 Key: PROTON-278
>                 URL: https://issues.apache.org/jira/browse/PROTON-278
>             Project: Qpid Proton
>          Issue Type: Improvement
>          Components: proton-c
>    Affects Versions: 0.4
>            Reporter: Ken Giusti
>            Priority: Blocker
>             Fix For: 0.5
>
>
> Currently, messenger always sets the reply-to field in a sent message.
> This should be changed to allow the application to set the reply-to field only when a reply is desired.  Messenger should be changed to not unconditionally set this field.
> In order to set this field in the case of a client that has not established a subscription, the client needs to be able to query messenger for the proper value of the reply-to address.  A new api would need to be created for this.  Proposal:
> int pn_messenger_set_reply( pn_messenger_t *msgr,  pn_message_t *msg )
> Set the proper reply-to address in msg.  msg would need to have its "to" address configured in order for this method to succeed.
> At least, I think the value for the reply-to may depend on the 'to' address... I may be wrong about that....
> Opinions?

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