[multifile]xhook(+Stream,
+Event)This multifile predicate is called on certain stream events. Defined
events are:
- delivery_failed(Id, Group, Delivered)
- A message was delivered more than specified by max_deliveries/1
of xlisten_group/5. Id
is the message id, Group the group and
Delivered the current delivery count. If the hooks fails, the
message is acknowledged using
XACK. From introduction
to streams:
"So once the deliveries counter reaches a given large
number that you chose, it is probably wiser to put such messages in
another stream and send a notification to the system administrator. This
is basically the way that Redis streams implement the concept of the
dead letter."
