Add redis: Boot 4.1 + Spring Data Redis 4.1, the JDK-serialisation default vs Jackson 3 serializers, @RedisHash TTL and keyspace events, @RedisListener, and Redis as the Spring cache

Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
2026-09-21 15:46:55 +00:00
parent 8cdfcd4d8d
commit b0c39a8d4c
60 changed files with 2900 additions and 1 deletions
@@ -0,0 +1,38 @@
+# Pub/Sub: what is delivered, to whom, and what is lost
+
+
+--- The container Boot created ---
+beans of type RedisMessageListenerContainer: [redisMessageListenerContainer]
+running=true listening=true
+
+--- Publishing to a channel nobody listens to ---
+template.convertAndSend("quiet", "hello?") = 0 receivers
+$ redis-cli -p 6390 --no-raw PUBSUB NUMSUB quiet
+1) "quiet"
+2) (integer) 0
+
+--- Publishing to news, which has an @RedisListener ---
+$ redis-cli -p 6390 --no-raw PUBSUB NUMSUB news
+1) "news"
+2) (integer) 1
+template.convertAndSend("news", "first") = 1 receiver
+@RedisListener got 'first'
+
+--- A second listener that subscribes late ---
+container.addMessageListener(late, new ChannelTopic("news"))
+$ redis-cli -p 6390 --no-raw PUBSUB NUMSUB news
+1) "news"
+2) (integer) 1
+template.convertAndSend("news", "second") = 1 receiver
+@RedisListener got 'first'
+@RedisListener got 'second'
+late listener got 'second' on news
+
+--- A pattern subscription (topic = "alerts.*") ---
+$ redis-cli -p 6390 --no-raw PUBSUB NUMPAT
+(integer) 1
+$ redis-cli -p 6390 --no-raw PUBSUB NUMSUB alerts.disk
+1) "alerts.disk"
+2) (integer) 0
+template.convertAndSend("alerts.disk", "90% full") = 1 receiver
+@RedisListener got '90% full' on alerts.disk