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101 lines
2.5 KiB
101 lines
2.5 KiB
10 years ago
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/**
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* Copyright 2013-2015, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule ReactPerf
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* @typechecks static-only
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*/
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'use strict';
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/**
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* ReactPerf is a general AOP system designed to measure performance. This
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* module only has the hooks: see ReactDefaultPerf for the analysis tool.
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*/
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var ReactPerf = {
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/**
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* Boolean to enable/disable measurement. Set to false by default to prevent
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* accidental logging and perf loss.
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*/
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enableMeasure: false,
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/**
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* Holds onto the measure function in use. By default, don't measure
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* anything, but we'll override this if we inject a measure function.
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*/
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storedMeasure: _noMeasure,
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/**
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* @param {object} object
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* @param {string} objectName
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* @param {object<string>} methodNames
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*/
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measureMethods: function(object, objectName, methodNames) {
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if ("production" !== process.env.NODE_ENV) {
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for (var key in methodNames) {
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if (!methodNames.hasOwnProperty(key)) {
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continue;
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}
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object[key] = ReactPerf.measure(
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objectName,
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methodNames[key],
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object[key]
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);
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}
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}
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},
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/**
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* Use this to wrap methods you want to measure. Zero overhead in production.
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*
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* @param {string} objName
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* @param {string} fnName
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* @param {function} func
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* @return {function}
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*/
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measure: function(objName, fnName, func) {
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if ("production" !== process.env.NODE_ENV) {
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var measuredFunc = null;
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var wrapper = function() {
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if (ReactPerf.enableMeasure) {
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if (!measuredFunc) {
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measuredFunc = ReactPerf.storedMeasure(objName, fnName, func);
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}
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return measuredFunc.apply(this, arguments);
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}
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return func.apply(this, arguments);
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};
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wrapper.displayName = objName + '_' + fnName;
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return wrapper;
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}
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return func;
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},
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injection: {
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/**
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* @param {function} measure
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*/
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injectMeasure: function(measure) {
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ReactPerf.storedMeasure = measure;
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}
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}
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};
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/**
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* Simply passes through the measured function, without measuring it.
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*
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* @param {string} objName
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* @param {string} fnName
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* @param {function} func
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* @return {function}
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*/
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function _noMeasure(objName, fnName, func) {
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return func;
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}
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module.exports = ReactPerf;
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