Destroyable dojo class - keep track of reference (handlers) to DOM events and event subscription. Remove them (automatically) when class instance is destoyed. dijit/Destroyable is a mixin class to track handles and release them.

DestroyableClass.js

define([
  "dojo/_base/declare",
  "dojo/_base/lang",
  "dojo/topic",
  "dijit/Destroyable"
], function(declare, lang, topic, Destroyable) {
  var _class = declare("DestroyableController", [Destroyable], {
    constructor: function(args) {
      declare.safeMixin();
      
      // Use own function from Destroyable interface to keep track of handlers
      this.own (
        topic.subscribe("/my/event/1", lang.hitch(this, this._onEventOne)),
        topic.subscribe("/my/event/2", lang.hitch(this, this._onEventTwo))
      );
    },
    
    _onEventOne: function(eventData) {
      // Overview:
      //  Handler for /my/event/1
      // Args:
      //  eventData - data from topic.publish("/my/event/1", eventData)
    },
    
    _onEventTwo: function(eventData) {
      // Overview:
      //  Handler for /my/event/2
      // Args:
      //  eventData - data from topic.publish("/my/event/2", eventData)
    }
  });
  
  return _class;
});