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From "Rafael H. Schloming (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PROTON-39) Implement pn_offer for sender links
Date Thu, 17 Oct 2013 18:38:46 GMT

     [ https://issues.apache.org/jira/browse/PROTON-39?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rafael H. Schloming updated PROTON-39:

    Labels: api credit  (was: api)

> Implement pn_offer for sender links
> -----------------------------------
>                 Key: PROTON-39
>                 URL: https://issues.apache.org/jira/browse/PROTON-39
>             Project: Qpid Proton
>          Issue Type: New Feature
>          Components: proton-c, proton-j
>            Reporter: Ted Ross
>              Labels: api, credit
>         Attachments: proton-39.patch
> The proposed patch adds two functions to the engine API:
> void pn_offer(link, credit)
> bool pn_connection_links_writeable(conn)
> pn_offer is used by the attached node to indicate to the engine that it has messages
available for immediate transfer over the link.
> pn_connection_links_writable returns true if the connection has at least one outgoing
link with both receiver credit and offered credit.  This is used by the driver to ensure that
the connection's FD (or equivalent) is in the set of writable FDs to be processed it the outgoing
transport is writable.
> Note that pn_offer is absolute (not cumulative).  The attached node is responsible for
keeping the offer vaule up-to-date as messages are sent and received.
> The patch does not make any changes to the protocol exchange.  Additional work is needed
to communicate the offer information to the remote receiver so the receiver can intelligently
manage its credits.
> The driving need for this change is for driver functionality.  pn_offer is the cleanest
mechanism for a node to tell the driver that an outbound link's connection should be processed.

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