example node.js event emitter

gistfile1.js

var util = require('util');
var events = require('events');
var redis = require('redis');

var RedisQueueConsumer = function (port, host) {
  events.EventEmitter.call(this);

  this.port = port || 6379;
  this.host = host || '127.0.0.1';
};
util.inherits(RedisQueueConsumer, events.EventEmitter);

RedisQueueConsumer.prototype.listen = function (queue) {
  var r = redis.createClient(this.port, this.host);
  var self = this;

  function _listen() {
    r.blpop(queue, 0, function(err, item) {
      if (!err && item) {
        self.emit('item', item);
      } else {
        self.emit('error', err);
      }
      _listen();
    });
  }

  return _listen();
}

module.exports = RedisQueueConsumer;

if (! module.parent) {
  q = new RedisQueueConsumer();
  q.on('item', console.log);
  q.listen('glug');
  q.listen('green');
  q.listen('pie');
  console.log('listening to glug, green, and pie');
}