@angular/core
Version:
Angular - the core framework
279 lines • 39.7 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 { Subscription } from 'rxjs';
import { ApplicationRef } from '../../application/application_ref';
import { Injectable } from '../../di/injectable';
import { inject } from '../../di/injector_compatibility';
import { makeEnvironmentProviders } from '../../di/provider_collection';
import { RuntimeError, formatRuntimeError } from '../../errors';
import { PendingTasks } from '../../pending_tasks';
import { scheduleCallbackWithMicrotask, scheduleCallbackWithRafRace, } from '../../util/callback_scheduler';
import { performanceMarkFeature } from '../../util/performance';
import { NgZone, NoopNgZone } from '../../zone/ng_zone';
import { ChangeDetectionScheduler, ZONELESS_ENABLED, PROVIDED_ZONELESS, ZONELESS_SCHEDULER_DISABLED, } from './zoneless_scheduling';
import * as i0 from "../../r3_symbols";
const CONSECUTIVE_MICROTASK_NOTIFICATION_LIMIT = 100;
let consecutiveMicrotaskNotifications = 0;
let stackFromLastFewNotifications = [];
function trackMicrotaskNotificationForDebugging() {
consecutiveMicrotaskNotifications++;
if (CONSECUTIVE_MICROTASK_NOTIFICATION_LIMIT - consecutiveMicrotaskNotifications < 5) {
const stack = new Error().stack;
if (stack) {
stackFromLastFewNotifications.push(stack);
}
}
if (consecutiveMicrotaskNotifications === CONSECUTIVE_MICROTASK_NOTIFICATION_LIMIT) {
throw new RuntimeError(103 /* RuntimeErrorCode.INFINITE_CHANGE_DETECTION */, 'Angular could not stabilize because there were endless change notifications within the browser event loop. ' +
'The stack from the last several notifications: \n' +
stackFromLastFewNotifications.join('\n'));
}
}
export class ChangeDetectionSchedulerImpl {
constructor() {
this.appRef = inject(ApplicationRef);
this.taskService = inject(PendingTasks);
this.ngZone = inject(NgZone);
this.zonelessEnabled = inject(ZONELESS_ENABLED);
this.disableScheduling = inject(ZONELESS_SCHEDULER_DISABLED, { optional: true }) ?? false;
this.zoneIsDefined = typeof Zone !== 'undefined' && !!Zone.root.run;
this.schedulerTickApplyArgs = [{ data: { '__scheduler_tick__': true } }];
this.subscriptions = new Subscription();
this.cancelScheduledCallback = null;
this.shouldRefreshViews = false;
this.useMicrotaskScheduler = false;
this.runningTick = false;
this.pendingRenderTaskId = null;
this.subscriptions.add(this.appRef.afterTick.subscribe(() => {
// If the scheduler isn't running a tick but the application ticked, that means
// someone called ApplicationRef.tick manually. In this case, we should cancel
// any change detections that had been scheduled so we don't run an extra one.
if (!this.runningTick) {
this.cleanup();
}
}));
this.subscriptions.add(this.ngZone.onUnstable.subscribe(() => {
// If the zone becomes unstable when we're not running tick (this happens from the zone.run),
// we should cancel any scheduled change detection here because at this point we
// know that the zone will stabilize at some point and run change detection itself.
if (!this.runningTick) {
this.cleanup();
}
}));
// TODO(atscott): These conditions will need to change when zoneless is the default
// Instead, they should flip to checking if ZoneJS scheduling is provided
this.disableScheduling ||=
!this.zonelessEnabled &&
// NoopNgZone without enabling zoneless means no scheduling whatsoever
(this.ngZone instanceof NoopNgZone ||
// The same goes for the lack of Zone without enabling zoneless scheduling
!this.zoneIsDefined);
}
notify(source) {
if (!this.zonelessEnabled && source === 5 /* NotificationSource.Listener */) {
// When the notification comes from a listener, we skip the notification unless the
// application has enabled zoneless. Ideally, listeners wouldn't notify the scheduler at all
// automatically. We do not know that a developer made a change in the listener callback that
// requires an `ApplicationRef.tick` (synchronize templates / run render hooks). We do this
// only for an easier migration from OnPush components to zoneless. Because listeners are
// usually executed inside the Angular zone and listeners automatically call `markViewDirty`,
// developers never needed to manually use `ChangeDetectorRef.markForCheck` or some other API
// to make listener callbacks work correctly with `OnPush` components.
return;
}
switch (source) {
case 3 /* NotificationSource.DebugApplyChanges */:
case 2 /* NotificationSource.DeferBlockStateUpdate */:
case 0 /* NotificationSource.MarkAncestorsForTraversal */:
case 4 /* NotificationSource.MarkForCheck */:
case 5 /* NotificationSource.Listener */:
case 1 /* NotificationSource.SetInput */: {
this.shouldRefreshViews = true;
break;
}
case 8 /* NotificationSource.ViewDetachedFromDOM */:
case 7 /* NotificationSource.ViewAttached */:
case 6 /* NotificationSource.NewRenderHook */:
case 9 /* NotificationSource.AsyncAnimationsLoaded */:
default: {
// These notifications only schedule a tick but do not change whether we should refresh
// views. Instead, we only need to run render hooks unless another notification from the
// other set is also received before `tick` happens.
}
}
if (!this.shouldScheduleTick()) {
return;
}
if (typeof ngDevMode === 'undefined' || ngDevMode) {
if (this.useMicrotaskScheduler) {
trackMicrotaskNotificationForDebugging();
}
else {
consecutiveMicrotaskNotifications = 0;
stackFromLastFewNotifications.length = 0;
}
}
const scheduleCallback = this.useMicrotaskScheduler
? scheduleCallbackWithMicrotask
: scheduleCallbackWithRafRace;
this.pendingRenderTaskId = this.taskService.add();
if (this.zoneIsDefined) {
Zone.root.run(() => {
this.cancelScheduledCallback = scheduleCallback(() => {
this.tick(this.shouldRefreshViews);
});
});
}
else {
this.cancelScheduledCallback = scheduleCallback(() => {
this.tick(this.shouldRefreshViews);
});
}
}
shouldScheduleTick() {
if (this.disableScheduling) {
return false;
}
// already scheduled or running
if (this.pendingRenderTaskId !== null || this.runningTick || this.appRef._runningTick) {
return false;
}
// If we're inside the zone don't bother with scheduler. Zone will stabilize
// eventually and run change detection.
if (!this.zonelessEnabled && this.zoneIsDefined && NgZone.isInAngularZone()) {
return false;
}
return true;
}
/**
* Calls ApplicationRef._tick inside the `NgZone`.
*
* Calling `tick` directly runs change detection and cancels any change detection that had been
* scheduled previously.
*
* @param shouldRefreshViews Passed directly to `ApplicationRef._tick` and skips straight to
* render hooks when `false`.
*/
tick(shouldRefreshViews) {
// When ngZone.run below exits, onMicrotaskEmpty may emit if the zone is
// stable. We want to prevent double ticking so we track whether the tick is
// already running and skip it if so.
if (this.runningTick || this.appRef.destroyed) {
return;
}
const task = this.taskService.add();
try {
this.ngZone.run(() => {
this.runningTick = true;
this.appRef._tick(shouldRefreshViews);
}, undefined, this.schedulerTickApplyArgs);
}
catch (e) {
this.taskService.remove(task);
throw e;
}
finally {
this.cleanup();
}
// If we're notified of a change within 1 microtask of running change
// detection, run another round in the same event loop. This allows code
// which uses Promise.resolve (see NgModel) to avoid
// ExpressionChanged...Error to still be reflected in a single browser
// paint, even if that spans multiple rounds of change detection.
this.useMicrotaskScheduler = true;
scheduleCallbackWithMicrotask(() => {
this.useMicrotaskScheduler = false;
this.taskService.remove(task);
});
}
ngOnDestroy() {
this.subscriptions.unsubscribe();
this.cleanup();
}
cleanup() {
this.shouldRefreshViews = false;
this.runningTick = false;
this.cancelScheduledCallback?.();
this.cancelScheduledCallback = null;
// If this is the last task, the service will synchronously emit a stable
// notification. If there is a subscriber that then acts in a way that
// tries to notify the scheduler again, we need to be able to respond to
// schedule a new change detection. Therefore, we should clear the task ID
// before removing it from the pending tasks (or the tasks service should
// not synchronously emit stable, similar to how Zone stableness only
// happens if it's still stable after a microtask).
if (this.pendingRenderTaskId !== null) {
const taskId = this.pendingRenderTaskId;
this.pendingRenderTaskId = null;
this.taskService.remove(taskId);
}
}
static { this.ɵfac = function ChangeDetectionSchedulerImpl_Factory(t) { return new (t || ChangeDetectionSchedulerImpl)(); }; }
static { this.ɵprov = /*@__PURE__*/ i0.ɵɵdefineInjectable({ token: ChangeDetectionSchedulerImpl, factory: ChangeDetectionSchedulerImpl.ɵfac, providedIn: 'root' }); }
}
(() => { (typeof ngDevMode === "undefined" || ngDevMode) && i0.setClassMetadata(ChangeDetectionSchedulerImpl, [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], () => [], null); })();
/**
* Provides change detection without ZoneJS for the application bootstrapped using
* `bootstrapApplication`.
*
* This function allows you to configure the application to not use the state/state changes of
* ZoneJS to schedule change detection in the application. This will work when ZoneJS is not present
* on the page at all or if it exists because something else is using it (either another Angular
* application which uses ZoneJS for scheduling or some other library that relies on ZoneJS).
*
* This can also be added to the `TestBed` providers to configure the test environment to more
* closely match production behavior. This will help give higher confidence that components are
* compatible with zoneless change detection.
*
* ZoneJS uses browser events to trigger change detection. When using this provider, Angular will
* instead use Angular APIs to schedule change detection. These APIs include:
*
* - `ChangeDetectorRef.markForCheck`
* - `ComponentRef.setInput`
* - updating a signal that is read in a template
* - when bound host or template listeners are triggered
* - attaching a view that was marked dirty by one of the above
* - removing a view
* - registering a render hook (templates are only refreshed if render hooks do one of the above)
*
* @usageNotes
* ```typescript
* bootstrapApplication(MyApp, {providers: [
* provideExperimentalZonelessChangeDetection(),
* ]});
* ```
*
* This API is experimental. Neither the shape, nor the underlying behavior is stable and can change
* in patch versions. There are known feature gaps and API ergonomic considerations. We will iterate
* on the exact API based on the feedback and our understanding of the problem and solution space.
*
* @publicApi
* @experimental
* @see [bootstrapApplication](/api/platform-browser/bootstrapApplication)
*/
export function provideExperimentalZonelessChangeDetection() {
performanceMarkFeature('NgZoneless');
if ((typeof ngDevMode === 'undefined' || ngDevMode) && typeof Zone !== 'undefined' && Zone) {
const message = formatRuntimeError(914 /* RuntimeErrorCode.UNEXPECTED_ZONEJS_PRESENT_IN_ZONELESS_MODE */, `The application is using zoneless change detection, but is still loading Zone.js. ` +
`Consider removing Zone.js to get the full benefits of zoneless. ` +
`In applications using the Angular CLI, Zone.js is typically included in the "polyfills" section of the angular.json file.`);
console.warn(message);
}
return makeEnvironmentProviders([
{ provide: ChangeDetectionScheduler, useExisting: ChangeDetectionSchedulerImpl },
{ provide: NgZone, useClass: NoopNgZone },
{ provide: ZONELESS_ENABLED, useValue: true },
typeof ngDevMode === 'undefined' || ngDevMode
? [{ provide: PROVIDED_ZONELESS, useValue: true }]
: [],
]);
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Subscription} from 'rxjs';\n\nimport {ApplicationRef} from '../../application/application_ref';\nimport {Injectable} from '../../di/injectable';\nimport {inject} from '../../di/injector_compatibility';\nimport {EnvironmentProviders} from '../../di/interface/provider';\nimport {makeEnvironmentProviders} from '../../di/provider_collection';\nimport {RuntimeError, RuntimeErrorCode, formatRuntimeError} from '../../errors';\nimport {PendingTasks} from '../../pending_tasks';\nimport {\n  scheduleCallbackWithMicrotask,\n  scheduleCallbackWithRafRace,\n} from '../../util/callback_scheduler';\nimport {performanceMarkFeature} from '../../util/performance';\nimport {NgZone, NoopNgZone} from '../../zone/ng_zone';\n\nimport {\n  ChangeDetectionScheduler,\n  NotificationSource,\n  ZONELESS_ENABLED,\n  PROVIDED_ZONELESS,\n  ZONELESS_SCHEDULER_DISABLED,\n} from './zoneless_scheduling';\n\nconst CONSECUTIVE_MICROTASK_NOTIFICATION_LIMIT = 100;\nlet consecutiveMicrotaskNotifications = 0;\nlet stackFromLastFewNotifications: string[] = [];\n\nfunction trackMicrotaskNotificationForDebugging() {\n  consecutiveMicrotaskNotifications++;\n  if (CONSECUTIVE_MICROTASK_NOTIFICATION_LIMIT - consecutiveMicrotaskNotifications < 5) {\n    const stack = new Error().stack;\n    if (stack) {\n      stackFromLastFewNotifications.push(stack);\n    }\n  }\n\n  if (consecutiveMicrotaskNotifications === CONSECUTIVE_MICROTASK_NOTIFICATION_LIMIT) {\n    throw new RuntimeError(\n      RuntimeErrorCode.INFINITE_CHANGE_DETECTION,\n      'Angular could not stabilize because there were endless change notifications within the browser event loop. ' +\n        'The stack from the last several notifications: \\n' +\n        stackFromLastFewNotifications.join('\\n'),\n    );\n  }\n}\n\n@Injectable({providedIn: 'root'})\nexport class ChangeDetectionSchedulerImpl implements ChangeDetectionScheduler {\n  private readonly appRef = inject(ApplicationRef);\n  private readonly taskService = inject(PendingTasks);\n  private readonly ngZone = inject(NgZone);\n  private readonly zonelessEnabled = inject(ZONELESS_ENABLED);\n  private readonly disableScheduling =\n    inject(ZONELESS_SCHEDULER_DISABLED, {optional: true}) ?? false;\n  private readonly zoneIsDefined = typeof Zone !== 'undefined' && !!Zone.root.run;\n  private readonly schedulerTickApplyArgs = [{data: {'__scheduler_tick__': true}}];\n  private readonly subscriptions = new Subscription();\n\n  private cancelScheduledCallback: null | (() => void) = null;\n  private shouldRefreshViews = false;\n  private useMicrotaskScheduler = false;\n  runningTick = false;\n  pendingRenderTaskId: number | null = null;\n\n  constructor() {\n    this.subscriptions.add(\n      this.appRef.afterTick.subscribe(() => {\n        // If the scheduler isn't running a tick but the application ticked, that means\n        // someone called ApplicationRef.tick manually. In this case, we should cancel\n        // any change detections that had been scheduled so we don't run an extra one.\n        if (!this.runningTick) {\n          this.cleanup();\n        }\n      }),\n    );\n    this.subscriptions.add(\n      this.ngZone.onUnstable.subscribe(() => {\n        // If the zone becomes unstable when we're not running tick (this happens from the zone.run),\n        // we should cancel any scheduled change detection here because at this point we\n        // know that the zone will stabilize at some point and run change detection itself.\n        if (!this.runningTick) {\n          this.cleanup();\n        }\n      }),\n    );\n\n    // TODO(atscott): These conditions will need to change when zoneless is the default\n    // Instead, they should flip to checking if ZoneJS scheduling is provided\n    this.disableScheduling ||=\n      !this.zonelessEnabled &&\n      // NoopNgZone without enabling zoneless means no scheduling whatsoever\n      (this.ngZone instanceof NoopNgZone ||\n        // The same goes for the lack of Zone without enabling zoneless scheduling\n        !this.zoneIsDefined);\n  }\n\n  notify(source: NotificationSource): void {\n    if (!this.zonelessEnabled && source === NotificationSource.Listener) {\n      // When the notification comes from a listener, we skip the notification unless the\n      // application has enabled zoneless. Ideally, listeners wouldn't notify the scheduler at all\n      // automatically. We do not know that a developer made a change in the listener callback that\n      // requires an `ApplicationRef.tick` (synchronize templates / run render hooks). We do this\n      // only for an easier migration from OnPush components to zoneless. Because listeners are\n      // usually executed inside the Angular zone and listeners automatically call `markViewDirty`,\n      // developers never needed to manually use `ChangeDetectorRef.markForCheck` or some other API\n      // to make listener callbacks work correctly with `OnPush` components.\n      return;\n    }\n    switch (source) {\n      case NotificationSource.DebugApplyChanges:\n      case NotificationSource.DeferBlockStateUpdate:\n      case NotificationSource.MarkAncestorsForTraversal:\n      case NotificationSource.MarkForCheck:\n      case NotificationSource.Listener:\n      case NotificationSource.SetInput: {\n        this.shouldRefreshViews = true;\n        break;\n      }\n      case NotificationSource.ViewDetachedFromDOM:\n      case NotificationSource.ViewAttached:\n      case NotificationSource.NewRenderHook:\n      case NotificationSource.AsyncAnimationsLoaded:\n      default: {\n        // These notifications only schedule a tick but do not change whether we should refresh\n        // views. Instead, we only need to run render hooks unless another notification from the\n        // other set is also received before `tick` happens.\n      }\n    }\n\n    if (!this.shouldScheduleTick()) {\n      return;\n    }\n\n    if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      if (this.useMicrotaskScheduler) {\n        trackMicrotaskNotificationForDebugging();\n      } else {\n        consecutiveMicrotaskNotifications = 0;\n        stackFromLastFewNotifications.length = 0;\n      }\n    }\n\n    const scheduleCallback = this.useMicrotaskScheduler\n      ? scheduleCallbackWithMicrotask\n      : scheduleCallbackWithRafRace;\n    this.pendingRenderTaskId = this.taskService.add();\n    if (this.zoneIsDefined) {\n      Zone.root.run(() => {\n        this.cancelScheduledCallback = scheduleCallback(() => {\n          this.tick(this.shouldRefreshViews);\n        });\n      });\n    } else {\n      this.cancelScheduledCallback = scheduleCallback(() => {\n        this.tick(this.shouldRefreshViews);\n      });\n    }\n  }\n\n  private shouldScheduleTick(): boolean {\n    if (this.disableScheduling) {\n      return false;\n    }\n    // already scheduled or running\n    if (this.pendingRenderTaskId !== null || this.runningTick || this.appRef._runningTick) {\n      return false;\n    }\n    // If we're inside the zone don't bother with scheduler. Zone will stabilize\n    // eventually and run change detection.\n    if (!this.zonelessEnabled && this.zoneIsDefined && NgZone.isInAngularZone()) {\n      return false;\n    }\n\n    return true;\n  }\n\n  /**\n   * Calls ApplicationRef._tick inside the `NgZone`.\n   *\n   * Calling `tick` directly runs change detection and cancels any change detection that had been\n   * scheduled previously.\n   *\n   * @param shouldRefreshViews Passed directly to `ApplicationRef._tick` and skips straight to\n   *     render hooks when `false`.\n   */\n  private tick(shouldRefreshViews: boolean): void {\n    // When ngZone.run below exits, onMicrotaskEmpty may emit if the zone is\n    // stable. We want to prevent double ticking so we track whether the tick is\n    // already running and skip it if so.\n    if (this.runningTick || this.appRef.destroyed) {\n      return;\n    }\n\n    const task = this.taskService.add();\n    try {\n      this.ngZone.run(\n        () => {\n          this.runningTick = true;\n          this.appRef._tick(shouldRefreshViews);\n        },\n        undefined,\n        this.schedulerTickApplyArgs,\n      );\n    } catch (e: unknown) {\n      this.taskService.remove(task);\n      throw e;\n    } finally {\n      this.cleanup();\n    }\n    // If we're notified of a change within 1 microtask of running change\n    // detection, run another round in the same event loop. This allows code\n    // which uses Promise.resolve (see NgModel) to avoid\n    // ExpressionChanged...Error to still be reflected in a single browser\n    // paint, even if that spans multiple rounds of change detection.\n    this.useMicrotaskScheduler = true;\n    scheduleCallbackWithMicrotask(() => {\n      this.useMicrotaskScheduler = false;\n      this.taskService.remove(task);\n    });\n  }\n\n  ngOnDestroy() {\n    this.subscriptions.unsubscribe();\n    this.cleanup();\n  }\n\n  private cleanup() {\n    this.shouldRefreshViews = false;\n    this.runningTick = false;\n    this.cancelScheduledCallback?.();\n    this.cancelScheduledCallback = null;\n    // If this is the last task, the service will synchronously emit a stable\n    // notification. If there is a subscriber that then acts in a way that\n    // tries to notify the scheduler again, we need to be able to respond to\n    // schedule a new change detection. Therefore, we should clear the task ID\n    // before removing it from the pending tasks (or the tasks service should\n    // not synchronously emit stable, similar to how Zone stableness only\n    // happens if it's still stable after a microtask).\n    if (this.pendingRenderTaskId !== null) {\n      const taskId = this.pendingRenderTaskId;\n      this.pendingRenderTaskId = null;\n      this.taskService.remove(taskId);\n    }\n  }\n}\n\n/**\n * Provides change detection without ZoneJS for the application bootstrapped using\n * `bootstrapApplication`.\n *\n * This function allows you to configure the application to not use the state/state changes of\n * ZoneJS to schedule change detection in the application. This will work when ZoneJS is not present\n * on the page at all or if it exists because something else is using it (either another Angular\n * application which uses ZoneJS for scheduling or some other library that relies on ZoneJS).\n *\n * This can also be added to the `TestBed` providers to configure the test environment to more\n * closely match production behavior. This will help give higher confidence that components are\n * compatible with zoneless change detection.\n *\n * ZoneJS uses browser events to trigger change detection. When using this provider, Angular will\n * instead use Angular APIs to schedule change detection. These APIs include:\n *\n * - `ChangeDetectorRef.markForCheck`\n * - `ComponentRef.setInput`\n * - updating a signal that is read in a template\n * - when bound host or template listeners are triggered\n * - attaching a view that was marked dirty by one of the above\n * - removing a view\n * - registering a render hook (templates are only refreshed if render hooks do one of the above)\n *\n * @usageNotes\n * ```typescript\n * bootstrapApplication(MyApp, {providers: [\n *   provideExperimentalZonelessChangeDetection(),\n * ]});\n * ```\n *\n * This API is experimental. Neither the shape, nor the underlying behavior is stable and can change\n * in patch versions. There are known feature gaps and API ergonomic considerations. We will iterate\n * on the exact API based on the feedback and our understanding of the problem and solution space.\n *\n * @publicApi\n * @experimental\n * @see [bootstrapApplication](/api/platform-browser/bootstrapApplication)\n */\nexport function provideExperimentalZonelessChangeDetection(): EnvironmentProviders {\n  performanceMarkFeature('NgZoneless');\n\n  if ((typeof ngDevMode === 'undefined' || ngDevMode) && typeof Zone !== 'undefined' && Zone) {\n    const message = formatRuntimeError(\n      RuntimeErrorCode.UNEXPECTED_ZONEJS_PRESENT_IN_ZONELESS_MODE,\n      `The application is using zoneless change detection, but is still loading Zone.js. ` +\n        `Consider removing Zone.js to get the full benefits of zoneless. ` +\n        `In applications using the Angular CLI, Zone.js is typically included in the \"polyfills\" section of the angular.json file.`,\n    );\n    console.warn(message);\n  }\n\n  return makeEnvironmentProviders([\n    {provide: ChangeDetectionScheduler, useExisting: ChangeDetectionSchedulerImpl},\n    {provide: NgZone, useClass: NoopNgZone},\n    {provide: ZONELESS_ENABLED, useValue: true},\n    typeof ngDevMode === 'undefined' || ngDevMode\n      ? [{provide: PROVIDED_ZONELESS, useValue: true}]\n      : [],\n  ]);\n}\n"]}