this question takes 3 seconds! What is Redis subscription channel?

[Joe Jung]

Hey guys, really stumped here:

I created JedisSubscription class (extends JedisPubSub) and subscription instance, but I am not sure what the CHANNEL should be: is it 

1) IP and PORT address of my master?

2) specific status message that I would like to receive information about?

3) my master's name?

Thanks a bunch! 

final Jedis slave1 = pool.getResource(); // just a node of Redis instance  

        final JedisSubscription listener = new JedisSubscription();

        

        new Thread(new Runnable() {

            @Override

            public void run() {

                try {

                    log.info("Subscribing to \"mymaster\". This thread is blocked.");

                    slave1.subscribe(listener, "+odown");

                    log.info("Subscription ended.");

                } catch(Exception ex) {

                    log.error("Subscription failure: ", ex);

                }

            }

        }).start();

[Greg Andrews]

The channel name is the name of an object on the Redis server.  The documentation doesn't describe what format the channel name should be in, but I believe following the guidelines for ordinary key names is a good starting point.  (the documentation says pub/sub channels are not keys, though)

The description and examples at http://redis.io/topics/pubsub suggest useful channel names would be topics like "news.music.jazz" or "apache.log.errors" rather than server identifiers like "12.34.56.78:8080".  However, you can pick the name that makes sense to you.

  -Greg

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