redis - Spring Data Redis - 支持命令 PUBSUB CHANNELS

Question

RedisTemplate 不支持PUBSUB CHANNELS 命令。所以一种方法是执行以下操作

   private JedisPool getJedisPool(){
        if (jedisPool == null)
        jedisPool = new JedisPool(redisConnectionFactory.getPoolConfig(), redisConnectionFactory.getHostName(), redisConnectionFactory.getPort());
        return jedisPool;
    }

    public Integer getNumChannels() {
        Integer count = 0;
        try (Jedis jedis = getJedisPool().getResource()) {
            List<String> channels = jedis.pubsubChannels("user.*");
            count = channels == null ? 0 : channels.size();
        } catch (Exception e) {
            logger.error("unable to get user count", e);
        } finally {
            //getJedisPool().close(); //No need for close or returnResource()
        }
    }

这是建议的方法吗？

Answer 1

这取决于您要去哪里。如果你打算只将它用于你自己的应用程序，那么你可以从 JedisConnectionFactory 获取一个 JedisConnection 并使用底层的 Jedis 实例来调用命令.

JedisConnectionFactory factory = …

// assuming you're using Redis Standalone or Redis Sentinel
RedisConnection connection = factory.getConnection();
try {
    if (connection instanceof JedisConnection) {
        Jedis jedis = ((JedisConnection) connection).getNativeConnection();
        List<String> strings = jedis.pubsubChannels("…");
    }
} finally {
    connection.close();
}

请注意，这仅适用于 Redis Standalone/Redis Sentinel，但不适用于 Redis Cluster，因为 JedisCluster 不会公开 pubsubChannels。