92 lines
2.2 KiB
JavaScript
92 lines
2.2 KiB
JavaScript
/**
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* Copyright (c) 2015-present, 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 RCTRenderingPerf
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* @flow
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*/
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'use strict';
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var ReactDebugTool = require('ReactDebugTool');
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var ReactPerf = require('ReactPerf');
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var invariant = require('fbjs/lib/invariant');
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var performanceNow = require('fbjs/lib/performanceNow');
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type perfModule = {
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start: () => void,
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stop: () => void,
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}
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var perfModules = [];
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var enabled = false;
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var lastRenderStartTime = 0;
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var totalRenderDuration = 0;
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var RCTRenderingPerfDevtool = {
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onBeginLifeCycleTimer(debugID, timerType) {
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if (timerType === 'render') {
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lastRenderStartTime = performanceNow();
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}
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},
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onEndLifeCycleTimer(debugID, timerType) {
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if (timerType === 'render') {
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var lastRenderDuration = performanceNow() - lastRenderStartTime;
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totalRenderDuration += lastRenderDuration;
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}
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},
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};
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var RCTRenderingPerf = {
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// Once perf is enabled, it stays enabled
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toggle: function() {
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console.log('Render perfomance measurements enabled');
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enabled = true;
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},
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start: function() {
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if (!enabled) {
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return;
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}
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ReactPerf.start();
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ReactDebugTool.addHook(RCTRenderingPerfDevtool);
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perfModules.forEach((module) => module.start());
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},
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stop: function() {
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if (!enabled) {
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return;
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}
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ReactPerf.stop();
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ReactPerf.printInclusive();
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ReactPerf.printWasted();
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ReactDebugTool.removeHook(RCTRenderingPerfDevtool);
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console.log(`Total time spent in render(): ${totalRenderDuration.toFixed(2)} ms`);
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lastRenderStartTime = 0;
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totalRenderDuration = 0;
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perfModules.forEach((module) => module.stop());
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},
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register: function(module: perfModule) {
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invariant(
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typeof module.start === 'function',
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'Perf module should have start() function'
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);
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invariant(
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typeof module.stop === 'function',
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'Perf module should have stop() function'
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);
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perfModules.push(module);
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}
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};
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module.exports = RCTRenderingPerf;
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