var redis = require("redis");var sub = redis.createClient(), pub = redis.createClient();var msg_count = 0;sub.on("subscribe", function (channel, count) {    pub.publish("a nice channel", "I am sending a message.");    pub.publish("a nice channel", "I am sending a second message.");    pub.publish("a nice channel", "I am sending my last message.");});sub.on("message", function (channel, message) {    console.log("sub channel " + channel + ": " + message);    msg_count += 1;    if (msg_count === 3) {        sub.unsubscribe();        sub.quit();        pub.quit();    }});sub.subscribe("a nice channel");