[PROTON-1502] always encode empty proprty maps as missing properties, not empty maps

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: proton-c-0.18.0
• Component/s: proton-c
• Assignee: Alan Conway
• Reporter: Alan Conway
• Created: 14/Jun/17 19:48
• Updated: 24/Oct/17 08:44
• Resolved: 15/Jun/17 17:54

Description

The AMQP spec allows 2 eqiuvalent encodings for message-annotations, delivery-annotations, application-properties and filter-sets if there are no annotations/properties or filters. They can either be encoded as missing property values in the message/source or as empty map values.

Proton should always encode as a missing value. This is the more compact representation, and more inter-operable since some incorrect AMQP implementations are confused by a present but empty map.

Issue Links

• relates to: DISPATCH-786 Message annotations transmitted on wire incorrectly