globalevents.js

/**
 * Global singleton
 */

var APP = {
	/**
	 * This sets up global events, persistant things
	 * throughout the app, etc.  Only should be called
	 * when the app is booted.
	 */
	init: function() {
		Ti.Geolocation.addEventListener("location", APP.location);
		Ti.Gesture.addEventListener('orientationchange', APP.orientationObserverUpdate);
	},
	location: function(_event) {
		// etc.	
	},
	orientationchange: function(_event) {
		var type = (_event.source.isLandscape()) ? 'landscape' : 'portrait';

		// Handle registerd controllers that have an orientation method
		for(controller in APP.Controllers) {
			if(APP.Controllers[controller].orientationUpdate) {
				APP.Controllers[controller].orientationUpdate( type );
			}
		}
	}
};

module.exports = APP;

someController.js

$.orientationUpdate = function(_type) {
	// handle stuff here
};