/*
Copyright (c) 2009, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 2.7.0
*/
YAHOO.namespace("tool");
/**
* The YUI JavaScript profiler.
* @module profiler
* @namespace YAHOO.tool
* @requires yahoo
*/
/**
* Profiles functions in JavaScript.
* @namespace YAHOO.tool
* @class Profiler
* @static
*/
YAHOO.tool.Profiler = {
//-------------------------------------------------------------------------
// Private Properties
//-------------------------------------------------------------------------
/**
* Container object on which to put the original unprofiled methods.
* @type Object
* @private
* @static
* @property _container
*/
_container : new Object(),
/**
* Call information for functions.
* @type Object
* @private
* @static
* @property _report
*/
_report : new Object(),
//-------------------------------------------------------------------------
// Private Methods
//-------------------------------------------------------------------------
/**
* Called when a method ends execution. Marks the start and end time of the
* method so it can calculate how long the function took to execute. Also
* updates min/max/avg calculations for the function.
* @param {String} name The name of the function to mark as stopped.
* @param {int} duration The number of milliseconds it took the function to
* execute.
* @return {Void}
* @private
* @static
*/
_saveData : function (name /*:String*/, duration /*:int*/){
//get the function data
var functionData /*:Object*/ = this._report[name];
//increment the calls
functionData.calls++;
functionData.points.push(duration);
//if it's already been called at least once, do more complex calculations
if (functionData.calls > 1) {
functionData.avg = ((functionData.avg*(functionData.calls-1))+duration)/functionData.calls;
functionData.min = Math.min(functionData.min, duration);
functionData.max = Math.max(functionData.max, duration);
} else {
functionData.avg = duration;
functionData.min = duration;
functionData.max = duration;
}
},
//-------------------------------------------------------------------------
// Reporting Methods
//-------------------------------------------------------------------------
/**
* Returns the average amount of time (in milliseconds) that the function
* with the given name takes to execute.
* @param {String} name The name of the function whose data should be returned.
* If an object type method, it should be 'constructor.prototype.methodName';
* a normal object method would just be 'object.methodName'.
* @return {float} The average time it takes the function to execute.
* @static
*/
getAverage : function (name /*:String*/) /*:float*/ {
return this._report[name].avg;
},
/**
* Returns the number of times that the given function has been called.
* @param {String} name The name of the function whose data should be returned.
* @return {int} The number of times the function was called.
* @static
*/
getCallCount : function (name /*:String*/) /*:int*/ {
return this._report[name].calls;
},
/**
* Returns the maximum amount of time (in milliseconds) that the function
* with the given name takes to execute.
* @param {String} name The name of the function whose data should be returned.
* If an object type method, it should be 'constructor.prototype.methodName';
* a normal object method would just be 'object.methodName'.
* @return {float} The maximum time it takes the function to execute.
*/
getMax : function (name /*:String*/) /*:int*/ {
return this._report[name].max;
},
/**
* Returns the minimum amount of time (in milliseconds) that the function
* with the given name takes to execute.
* @param {String} name The name of the function whose data should be returned.
* If an object type method, it should be 'constructor.prototype.methodName';
* a normal object method would just be 'object.methodName'.
* @return {float} The minimum time it takes the function to execute.
*/
getMin : function (name /*:String*/) /*:int*/ {
return this._report[name].min;
},
/**
* Returns an object containing profiling data for a single function.
* The object has an entry for min, max, avg, calls, and points).
* @return {Object} An object containing profile data for a given function.
* @static
*/
getFunctionReport : function (name /*:String*/) /*:Object*/ {
return this._report[name];
},
/**
* Returns an object containing profiling data for all of the functions
* that were profiled. The object has an entry for each function and
* returns all information (min, max, average, calls, etc.) for each
* function.
* @return {Object} An object containing all profile data.
* @static
*/
getFullReport : function (filter /*:Function*/) /*:Object*/ {
filter = filter || function(){return true;};
if (YAHOO.lang.isFunction(filter)) {
var report = {};
for (var name in this._report){
if (filter(this._report[name])){
report[name] = this._report[name];
}
}
return report;
}
},
//-------------------------------------------------------------------------
// Profiling Methods
//-------------------------------------------------------------------------
/**
* Sets up a constructor for profiling, including all properties and methods on the prototype.
* @param {string} name The fully-qualified name of the function including namespace information.
* @param {Object} owner (Optional) The object that owns the function (namespace or containing object).
* @return {Void}
* @static
*/
registerConstructor : function (name /*:String*/, owner /*:Object*/) /*:Void*/ {
this.registerFunction(name, owner, true);
},
/**
* Sets up a function for profiling. It essentially overwrites the function with one
* that has instrumentation data. This method also creates an entry for the function
* in the profile report. The original function is stored on the _container object.
* @param {String} name The full name of the function including namespacing. This
* is the name of the function that is stored in the report.
* @param {Object} owner (Optional) The object that owns the function. If the function
* isn't global then this argument is required. This could be the namespace that
* the function belongs to, such as YAHOO.util.Dom, or the object on which it's
* a method.
* @return {Void}
* @method registerFunction
*/
registerFunction : function(name /*:String*/, owner /*:Object*/, registerPrototype /*:Boolean*/) /*:Void*/{
//figure out the function name without namespacing
var funcName /*:String*/ = (name.indexOf(".") > -1 ? name.substring(name.lastIndexOf(".")+1) : name);
if (!YAHOO.lang.isObject(owner)){
owner = eval(name.substring(0, name.lastIndexOf(".")));
}
//get the method and prototype
var method /*:Function*/ = owner[funcName];
var prototype /*:Object*/ = method.prototype;
//see if the method has already been registered
if (YAHOO.lang.isFunction(method) && !method.__yuiProfiled){
//create a new slot for the original method
this._container[name] = method;
//replace the function with the profiling one
owner[funcName] = function () {
var start = new Date();
var retval = method.apply(this, arguments);
var stop = new Date();
YAHOO.tool.Profiler._saveData(name, stop-start);
return retval;
};
//copy the function properties over
YAHOO.lang.augmentObject(owner[funcName], method);
owner[funcName].__yuiProfiled = true;
owner[funcName].prototype = prototype;
this._container[name].__yuiOwner = owner;
this._container[name].__yuiFuncName = funcName;
//register prototype if necessary
if (registerPrototype) {
this.registerObject(name + ".prototype", prototype);
}
//store function information
this._report[name] = {
calls: 0,
max: 0,
min: 0,
avg: 0,
points: []
};
}
return method;
},
/**
* Sets up an object for profiling. It takes the object and looks for functions.
* When a function is found, registerMethod() is called on it. If set to recrusive
* mode, it will also setup objects found inside of this object for profiling,
* using the same methodology.
* @param {String} name The name of the object to profile (shows up in report).
* @param {Object} owner (Optional) The object represented by the name.
* @param {Boolean} recurse (Optional) Determines if subobject methods are also profiled.
* @return {Void}
* @static
*/
registerObject : function (name /*:String*/, object /*:Object*/, recurse /*:Boolean*/) /*:Void*/{
//get the object
object = (YAHOO.lang.isObject(object) ? object : eval(name));
//save the object
this._container[name] = object;
for (var prop in object) {
if (typeof object[prop] == "function"){
if (prop != "constructor" && prop != "superclass"){ //don't do constructor or superclass, it's recursive
this.registerFunction(name + "." + prop, object);
}
} else if (typeof object[prop] == "object" && recurse){
this.registerObject(name + "." + prop, object[prop], recurse);
}
}
},
/**
* Removes a constructor function from profiling. Reverses the registerConstructor() method.
* @param {String} name The full name of the function including namespacing. This
* is the name of the function that is stored in the report.
* @return {Void}
* @method unregisterFunction
*/
unregisterConstructor : function(name /*:String*/) /*:Void*/{
//see if the method has been registered
if (YAHOO.lang.isFunction(this._container[name])){
//get original data
//var owner /*:Object*/ = this._container[name].__yuiOwner;
//var funcName /*:String*/ = this._container[name].__yuiFuncName;
//delete this._container[name].__yuiOwner;
//delete this._container[name].__yuiFuncName;
//replace instrumented function
//owner[funcName] = this._container[name];
//delete this._container[name];
this.unregisterFunction(name, true);
}
},
/**
* Removes function from profiling. Reverses the registerFunction() method.
* @param {String} name The full name of the function including namespacing. This
* is the name of the function that is stored in the report.
* @return {Void}
* @method unregisterFunction
*/
unregisterFunction : function(name /*:String*/, unregisterPrototype /*:Boolean*/) /*:Void*/{
//see if the method has been registered
if (YAHOO.lang.isFunction(this._container[name])){
//check to see if you should unregister the prototype
if (unregisterPrototype){
this.unregisterObject(name + ".prototype", this._container[name].prototype);
}
//get original data
var owner /*:Object*/ = this._container[name].__yuiOwner;
var funcName /*:String*/ = this._container[name].__yuiFuncName;
delete this._container[name].__yuiOwner;
delete this._container[name].__yuiFuncName;
//replace instrumented function
owner[funcName] = this._container[name];
//delete supporting information
delete this._container[name];
delete this._report[name];
}
},
/**
* Unregisters an object for profiling. It takes the object and looks for functions.
* When a function is found, unregisterMethod() is called on it. If set to recrusive
* mode, it will also unregister objects found inside of this object,
* using the same methodology.
* @param {String} name The name of the object to unregister.
* @param {Boolean} recurse (Optional) Determines if subobject methods should also be
* unregistered.
* @return {Void}
* @static
*/
unregisterObject : function (name /*:String*/, recurse /*:Boolean*/) /*:Void*/{
//get the object
if (YAHOO.lang.isObject(this._container[name])){
var object = this._container[name];
for (var prop in object) {
if (typeof object[prop] == "function"){
this.unregisterFunction(name + "." + prop);
} else if (typeof object[prop] == "object" && recurse){
this.unregisterObject(name + "." + prop, recurse);
}
}
delete this._container[name];
}
}
};
YAHOO.register("profiler", YAHOO.tool.Profiler, {version: "2.7.0", build: "1799"});
Submit an article or tip