MethodProfiler

MethodProfiler.js

var MethodProfiler = function(component) {
  this.component = component;
  this.timers = {};
  this.log = document.createElement("ul");
  var body = document.body;
  document.getElementById("result").appendChild(this.log);
  for(var key in this.component) {
    // Ensure that the property is a function.
    if(typeof this.component[key] !== 'function') {
      continue;
    }
    // Add the method.
    var that = this;
    (function(methodName) {
      that[methodName] = function() {
        that.startTimer(methodName);
        var returnValue = that.component[methodName].apply(that.component,arguments);
        that.displayTime(methodName, that.getElapsedTime(methodName));
        return returnValue;
      };
    })(key); }
};
MethodProfiler.prototype = {
  startTimer: function(methodName) {
    this.timers[methodName] = (new Date()).getTime();
  },
  getElapsedTime: function(methodName) {
    return (new Date()).getTime() - this.timers[methodName];
  },
  displayTime: function(methodName, time) {
  	var li = document.createElement("li");
	var text = document.createTextNode(methodName + ': ' + time + ' ms');
    li.appendChild(text);
	this.log.appendChild(li);
  }
};