@angular/platform-browser
Version:
Angular - library for using Angular in a web browser
69 lines • 8.13 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { ApplicationRef } from '@angular/core';
import { window } from './browser';
export class ChangeDetectionPerfRecord {
constructor(msPerTick, numTicks) {
this.msPerTick = msPerTick;
this.numTicks = numTicks;
}
}
/**
* Entry point for all Angular profiling-related debug tools. This object
* corresponds to the `ng.profiler` in the dev console.
*/
export class AngularProfiler {
constructor(ref) {
this.appRef = ref.injector.get(ApplicationRef);
}
// tslint:disable:no-console
/**
* Exercises change detection in a loop and then prints the average amount of
* time in milliseconds how long a single round of change detection takes for
* the current state of the UI. It runs a minimum of 5 rounds for a minimum
* of 500 milliseconds.
*
* Optionally, a user may pass a `config` parameter containing a map of
* options. Supported options are:
*
* `record` (boolean) - causes the profiler to record a CPU profile while
* it exercises the change detector. Example:
*
* ```
* ng.profiler.timeChangeDetection({record: true})
* ```
*/
timeChangeDetection(config) {
const record = config && config['record'];
const profileName = 'Change Detection';
// Profiler is not available in Android browsers without dev tools opened
const isProfilerAvailable = window.console.profile != null;
if (record && isProfilerAvailable) {
window.console.profile(profileName);
}
const start = performanceNow();
let numTicks = 0;
while (numTicks < 5 || (performanceNow() - start) < 500) {
this.appRef.tick();
numTicks++;
}
const end = performanceNow();
if (record && isProfilerAvailable) {
window.console.profileEnd(profileName);
}
const msPerTick = (end - start) / numTicks;
window.console.log(`ran ${numTicks} change detection cycles`);
window.console.log(`${msPerTick.toFixed(2)} ms per check`);
return new ChangeDetectionPerfRecord(msPerTick, numTicks);
}
}
function performanceNow() {
return window.performance && window.performance.now ? window.performance.now() :
new Date().getTime();
}
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