JavaScript Mediator Pattern

mediator.js

Utils = {};

/**
 * Mediator pattern based on previous work by @rpflorence, depends on underscore :)
 *
 * Subscribe to an event:
 *   Utils.mediator.subscribe('FOO', onFoo);
 *   function onFoo(data) {alert(data.bar);};
 *   
 * Fire an event:
 *   Utils.mediator.publish('FOO', {bar: true});
 *
 * @license MIT
 * @author Mohamed Mansour (http://mohamedmansour.com)
 */
Utils.mediator = (function() {
  /**
   * Subsribes to a channel and listens.
   *
   * @param {string} channel The channel to subscribe to.
   * @param {function} callback The callback for the response of the subscription.
   */
  var subscribe = function(channel, callback) {
    if (!this.channels[channel]) this.channels[channel] = [];
    this.channels[channel].push({ context: this, callback: callback });
    return this;
  },

  /**
   * Publishes to a channel with optional data.
   *
   * @param {string} channel The channel to publish data to.
   * @param {...*} arguments Can publish any data.
   */
  publish = function(channel) {
    if (!this.channels[channel]) return false;
    var args = Array.prototype.slice.call(arguments, 1);
    _.each(this.channels[channel], function(subscription) {
      subscription.callback.apply(subscription.context, args);
    });
    return this;
  };

  return {
    channels: {},
    subscribe: subscribe,
    publish: publish
  }
})();