[DISPATCH-15] Add different forwarding semantics for addresses

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.1
• Fix Version/s: 0.2
• Assignee: Ted Ross
• Reporter: Ted Ross
• Created: 30/Jan/14 18:35
• Updated: 20/Nov/17 18:39
• Resolved: 06/Feb/14 22:32

Description

At present, if there are multiple receivers for a particular address, Dispatch delivers a copy of each message to all of the receivers. This feature adds the ability to by-configuration deliver messages to only one of those receivers.

The configuration for this feature is per-address and defines two settings:

• fanout is either Multiple or Single (and a placeholder for Group). Multiple fanout means all subscribers receive each message. Single fanout means that only one subscriber receives the message.
• bias controls how single-fanout is treated. The following values for bias are provided:
  • Closest - each message is delivered to the closest/least-cost subscriber.
  • Spread - messages are spread indeterminately across all subscribers.
  • Latency - (not implemented yet) Messages are delivered in a balanced way to all subscribers based on the latency of acknowledgements. This mode attempts to keep all subscribers equally fed with incoming messages.

Issue Links

• is cloned by: DISPATCH-710 Dispatch - Add different forwarding semantics for addresses