Spring data redis - listen to expiration event - redis

Question

I would like to listen expiration events with KeyExpirationEventMessageListener but I can't find an example.
Someone know how to do it using Spring boot 1.4.3 & Spring Data Redis?
I am currently doing this
JedisPool pool = new JedisPool(new JedisPoolConfig(), "localhost");
this.jedis = pool.getResource();
this.jedis.psubscribe(new JedisPubSub() {
#Override
public void onPMessage(String pattern, String channel, String message) {
System.out.println("onPMessage pattern " + pattern + " " + channel + " " + message);
List<Object> txResults = redisTemplate.execute(new SessionCallback<List<Object>>() {
public List<Object> execute(RedisOperations operations) throws DataAccessException {
operations.multi();
operations.opsForValue().get("val:" + message);
operations.delete("val:" + message);
return operations.exec();
}
});
System.out.println(txResults.get(0));
}
}, "__keyevent#0__:expired");
And I would like to use Spring instead of Jedis directly.
Regards

Answer 1

Don't use KeyExpirationEventMessageListener as it triggers RedisKeyExpiredEvent which then leads to a failure in RedisKeyValueAdapter.onApplicationEvent.
Rather use RedisMessageListenerContainer:
#Bean
RedisMessageListenerContainer keyExpirationListenerContainer(RedisConnectionFactory connectionFactory) {
RedisMessageListenerContainer listenerContainer = new RedisMessageListenerContainer();
listenerContainer.setConnectionFactory(connectionFactory);
listenerContainer.addMessageListener((message, pattern) -> {
// event handling comes here
}, new PatternTopic("__keyevent#*__:expired"));
return listenerContainer;
}
RedisMessageListenerContainer runs all notifications on an own thread.