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https://github.com/facebook/react.git
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Paul O’Shannessy
8a47813baa
grep -rl 'Copyright 2013 Facebook' static_upstream | xargs perl -pi -w -e s/Copyright 2013 Facebook/Copyright 2013-2014 Facebook/g;' Not going to check in a script to do this since it will just change every year. Closes #1006
86 lines
2.2 KiB
JavaScript
86 lines
2.2 KiB
JavaScript
/**
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* Copyright 2013-2014 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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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* 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 (__DEV__) {
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var measuredFunc = null;
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return 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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}
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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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