106 lines
2.3 KiB
JavaScript
106 lines
2.3 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 PerformanceLogger
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*/
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'use strict';
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var performanceNow = require('performanceNow');
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var timespans = {};
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/**
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* This is meant to collect and log performance data in production, which means
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* it needs to have minimal overhead.
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*/
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var PerformanceLogger = {
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addTimespan(key, lengthInMs, description) {
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if (timespans[key]) {
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if (__DEV__) {
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console.log(
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'PerformanceLogger: Attempting to add a timespan that already exists ',
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key
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);
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}
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return;
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}
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timespans[key] = {
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description: description,
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totalTime: lengthInMs,
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};
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},
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startTimespan(key, description) {
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if (timespans[key]) {
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if (__DEV__) {
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console.log(
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'PerformanceLogger: Attempting to start a timespan that already exists ',
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key,
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);
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}
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return;
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}
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timespans[key] = {
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description: description,
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startTime: performanceNow(),
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};
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},
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stopTimespan(key) {
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if (!timespans[key] || !timespans[key].startTime) {
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if (__DEV__) {
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console.log(
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'PerformanceLogger: Attempting to end a timespan that has not started ',
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key,
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);
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}
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return;
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}
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timespans[key].endTime = performanceNow();
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timespans[key].totalTime =
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timespans[key].endTime - timespans[key].startTime;
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},
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clearTimespans() {
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timespans = {};
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},
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getTimespans() {
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return timespans;
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},
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hasTimespan(key) {
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return !!timespans[key];
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},
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logTimespans() {
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for (var key in timespans) {
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if (timespans[key].totalTime) {
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console.log(key + ': ' + timespans[key].totalTime + 'ms');
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}
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}
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},
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addTimespans(newTimespans, labels) {
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for (var i = 0, l = newTimespans.length; i < l; i += 2) {
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var label = labels[i / 2];
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PerformanceLogger.addTimespan(
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label,
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(newTimespans[i + 1] - newTimespans[i]),
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label
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);
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}
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}
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};
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module.exports = PerformanceLogger;
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