A tracer object to Titanium Mobile to show elapsed time and memory usage

tracer.js

/**
 * Courtesy of Jeff Bonnes
 * http://www.titaniumdevelopment.com.au/blog/2011/09/12/debugging-ipad-performance-and-memory-usage/
 */

/**
 * Modified to a commonJS format by Stephen Feather
 * Usage: 
 * var Tracer = require('/lib/tracer'); 
 * tracer = Tracer.createTracer('sqlite');
 * tracer.info('Starting Database Run');
 * tracer.info('Finished Database Run');
 */

	exports.levels = {};
	exports.levels.DEBUG = 1;
	exports.levels.INFO = 2;
	exports.levels.WARN = 3;
	exports.levels.ERROR = 4;
	exports.levels.OFF = 5;
	exports.allTracers = [];

	exports.createTracer = function(name) {

		var t = {};
		t.name = name;

		t.startTimer = function(){
		  t.startTime = (new Date()).valueOf();
		};

		t.resetMemory = function(){
		 t.startMem = Ti.Platform.availableMemory;
		};

		t.startTimer();
	    t.resetMemory();

		function makeMsg( msg ){
	      var dateTemp = new Date();
          var elapsed = dateTemp.valueOf() - t.startTime;
          var currMem = Ti.Platform.availableMemory;
          var avilableMem = Math.round(currMem) + 'mb';
          var deltaMem = Math.round(t.startMem - currMem) + 'mb';
          return( t.name  + "\t" + elapsed + "\t" + avilableMem + "\t" + deltaMem + "\t" + msg );
		};

		t.level = exports.levels.INFO;

		t.setLevel = function(level) {
			t.level = level;
		};

		t.debug = function(msg) {
			if( t.level <= exports.levels.DEBUG ){
			  Ti.API.debug(makeMsg(msg));	
			}
		};

		t.info = function(msg) {
			if( t.level <= exports.levels.INFO ){
			  Ti.API.info(makeMsg(msg));	
			}
		};

		t.warn = function(msg) {
			if( t.level <= exports.levels.WARN ){
			  Ti.API.warn(makeMsg(msg));	
			}
		};

		t.error = function(msg) {
			if( t.level <= exports.levels.ERROR ){
			  Ti.API.error(makeMsg(msg));	
			}
		};

        exports.allTracers.push(t);
        
        return t;

	};

	exports.removeTracer = function( t ){
		var id = exports.allTracers.indexOf( t );
		if( id > -1 ){
			exports.allTracers.splice( id , 1 );
		}
	};