| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | import { ApplicationRef } from '@angular/core';
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| 9 | import { window } from './browser';
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| 10 | export class ChangeDetectionPerfRecord {
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| 11 | constructor(msPerTick, numTicks) {
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| 12 | this.msPerTick = msPerTick;
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| 13 | this.numTicks = numTicks;
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| 14 | }
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| 15 | }
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| 16 | /**
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| 17 | * Entry point for all Angular profiling-related debug tools. This object
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| 18 | * corresponds to the `ng.profiler` in the dev console.
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| 19 | */
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| 20 | export class AngularProfiler {
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| 21 | constructor(ref) {
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| 22 | this.appRef = ref.injector.get(ApplicationRef);
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| 23 | }
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| 24 | // tslint:disable:no-console
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| 25 | /**
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| 26 | * Exercises change detection in a loop and then prints the average amount of
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| 27 | * time in milliseconds how long a single round of change detection takes for
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| 28 | * the current state of the UI. It runs a minimum of 5 rounds for a minimum
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| 29 | * of 500 milliseconds.
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| 30 | *
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| 31 | * Optionally, a user may pass a `config` parameter containing a map of
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| 32 | * options. Supported options are:
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| 33 | *
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| 34 | * `record` (boolean) - causes the profiler to record a CPU profile while
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| 35 | * it exercises the change detector. Example:
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| 36 | *
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| 37 | * ```
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| 38 | * ng.profiler.timeChangeDetection({record: true})
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| 39 | * ```
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| 40 | */
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| 41 | timeChangeDetection(config) {
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| 42 | const record = config && config['record'];
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| 43 | const profileName = 'Change Detection';
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| 44 | // Profiler is not available in Android browsers without dev tools opened
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| 45 | const isProfilerAvailable = window.console.profile != null;
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| 46 | if (record && isProfilerAvailable) {
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| 47 | window.console.profile(profileName);
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| 48 | }
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| 49 | const start = performanceNow();
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| 50 | let numTicks = 0;
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| 51 | while (numTicks < 5 || (performanceNow() - start) < 500) {
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| 52 | this.appRef.tick();
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| 53 | numTicks++;
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| 54 | }
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| 55 | const end = performanceNow();
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| 56 | if (record && isProfilerAvailable) {
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| 57 | window.console.profileEnd(profileName);
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| 58 | }
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| 59 | const msPerTick = (end - start) / numTicks;
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| 60 | window.console.log(`ran ${numTicks} change detection cycles`);
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| 61 | window.console.log(`${msPerTick.toFixed(2)} ms per check`);
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| 62 | return new ChangeDetectionPerfRecord(msPerTick, numTicks);
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| 63 | }
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| 64 | }
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| 65 | function performanceNow() {
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| 66 | return window.performance && window.performance.now ? window.performance.now() :
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| 67 | new Date().getTime();
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| 68 | }
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| 69 | //# 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