[MAILBOX-373] Dead letter API + Contract + Memory default implemetation

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.3.0
• Assignee: Unassigned
• Reporter: Trần Tiến Đức
• Created: 04/Jan/19 11:43
• Updated: 20/Mar/19 02:03
• Resolved: 10/Jan/19 09:49

Description

From MAILBOX-372 :

 

When the EventBus maxRetry is exceeded on a MailboxListner execution is exceeded we will store it in the *EventDeadLetter*.

The goal of this ticket is to define this API in `mailbox/api`, propose its test contract and a default implementation, memory based, exposed in `mailbox/event/memory`.

Please note that it should have a `MultiMap<Group, Event>` structure: given a listener, give me the failed events.

This allows:

• audit.
• To schedule a redelivery (very usefull for instance when ElasticSearch is crashed)