react-native/Libraries/Utilities/BridgeProfiling.js

59 lines
1.6 KiB
JavaScript

/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule BridgeProfiling
* @flow
*/
'use strict';
var GLOBAL = GLOBAL || this;
var BridgeProfiling = {
profile(profileName?: any, args?: any) {
if (GLOBAL.__BridgeProfilingIsProfiling) {
if (args) {
try {
args = JSON.stringify(args);
} catch(err) {
args = err.message;
}
}
profileName = typeof profileName === 'function' ?
profileName() : profileName;
console.profile(profileName, args);
}
},
profileEnd(profileName?: string) {
if (GLOBAL.__BridgeProfilingIsProfiling) {
console.profileEnd(profileName);
}
},
swizzleReactPerf() {
var ReactPerf = require('ReactPerf');
var originalMeasure = ReactPerf.measure;
ReactPerf.measure = function (objName, fnName, func) {
func = originalMeasure.call(ReactPerf, objName, fnName, func);
return function (component) {
BridgeProfiling.profile();
var ret = func.apply(this, arguments);
if (GLOBAL.__BridgeProfilingIsProfiling) {
var name = this._instance && this._instance.constructor &&
(this._instance.constructor.displayName ||
this._instance.constructor.name);
BridgeProfiling.profileEnd(`${objName}.${fnName}(${name})`);
}
return ret;
};
};
},
};
module.exports = BridgeProfiling;