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  1. Qpid Proton
  2. PROTON-317

Feature Enhancement - API Exposure of underlying references to internal atoms

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.3
    • Fix Version/s: 0.5
    • Component/s: proton-c
    • Labels:
      None
    • Environment:
      Linux / C implementation

      Description

      We're currently creating a pn_message_t and iterating over it using the pn_data_t data type and the various convenience methods surrounding it. This is great for iteration but we were also hoping to have a way to mark a point in the payload for future realignment. I looked at get_message_id() but that always seems to return NULL.

      Let's take a pseudo example:

      pn_data_rewind (pn_data);
      while (pn_data_next (pn_data))
      {
      pn_atom_t atom = pn_data_get_atom (pn_data);
      if(this_atom_might_be_useful)

      { // Mark this for potential modification later }

      }

      if (changes_are_required_based_on_a_combination_of_circumstances)
      {
      // Jump to earlier marker(s)

      // put in relevant update(s)
      }

      Is there anything we could use for this sort of use case? I want to avoid having to iterate again to find values, and I also want to be able to write functions which don't move (or move, then reset) the internal buffer pointers in proton. If there was something like a get_position() or set_position(), that would be perfect.

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            • Assignee:
              rhs Rafael H. Schloming
              Reporter:
              fquinn Frank Quinn
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              • Created:
                Updated:
                Resolved: