# Pub/Sub is at-most-once: a stopped listener loses messages


--- Stop the listener container, then publish ---
container.stop()
$ redis-cli -p 6390 --no-raw PUBSUB NUMSUB news
1) "news"
2) (integer) 0
template.convertAndSend("news", "while you were away") = 0 receivers

--- Start it again ---
container.start()
$ redis-cli -p 6390 --no-raw PUBSUB NUMSUB news
1) "news"
2) (integer) 1
messages the listener has: []

--- Once it is back, messages flow again ---
template.convertAndSend("news", "welcome back") = 1 receiver
@RedisListener got 'welcome back'