Evaluating safe or apiSafe in a 'filters' block allows the user to mark
certain messages for safe handling. When marked thus, any matching handlers
for these messages are evaluated without fully de-queueing the message from
the priority queue, such that if we receive and handle (i.e. swallow) an
exit signal, the message will be available for re-processing. Only once a
message has been safely processed will it be fully dequeued from the internal
mailbox/queue.
Evaluating
safeorapiSafein a 'filters' block allows the user to mark certain messages for safe handling. When marked thus, any matching handlers for these messages are evaluated without fully de-queueing the message from the priority queue, such that if we receive and handle (i.e. swallow) an exit signal, the message will be available for re-processing. Only once a message has been safely processed will it be fully dequeued from the internal mailbox/queue.