jquery.topic.js

/*
 * A simple callback wrapper to have topics
 */
;(function(d) {
  var topics = {};

  d.Topic = function( id ) {
    var callbacks,
    method,
    topic = id && topics[ id ];

    if ( !topic ) {
      callbacks = jQuery.Callbacks();
      topic = {
        publish: callbacks.fire,
        subscribe: callbacks.add,
        unsubscribe: callbacks.remove,
        subscribe_once: function(fn) {
          var wrapper_fn = function(value) {
            callbacks.remove(wrapper_fn);
            return fn(value);
          };
          callbacks.add(wrapper_fn);
        }
      };
      if ( id ) {
        topics[ id ] = topic;
      }
    }
    return topic;
  };
})(jQuery);

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