@angular/core
Version:
Angular - the core framework
177 lines • 26.1 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 { createWatch } from '@angular/core/primitives/signals';
import { ChangeDetectorRef } from '../../change_detection';
import { assertInInjectionContext } from '../../di/contextual';
import { InjectionToken } from '../../di/injection_token';
import { Injector } from '../../di/injector';
import { inject } from '../../di/injector_compatibility';
import { ɵɵdefineInjectable } from '../../di/interface/defs';
import { ErrorHandler } from '../../error_handler';
import { DestroyRef } from '../../linker/destroy_ref';
import { FLAGS, EFFECTS_TO_SCHEDULE } from '../interfaces/view';
import { assertNotInReactiveContext } from './asserts';
import { performanceMarkFeature } from '../../util/performance';
import { PendingTasks } from '../../pending_tasks';
/**
* Not public API, which guarantees `EffectScheduler` only ever comes from the application root
* injector.
*/
export const APP_EFFECT_SCHEDULER = new InjectionToken('', {
providedIn: 'root',
factory: () => inject(EffectScheduler),
});
/**
* A scheduler which manages the execution of effects.
*/
export class EffectScheduler {
/** @nocollapse */
static { this.ɵprov = ɵɵdefineInjectable({
token: EffectScheduler,
providedIn: 'root',
factory: () => new ZoneAwareEffectScheduler(),
}); }
}
/**
* A wrapper around `ZoneAwareQueueingScheduler` that schedules flushing via the microtask queue
* when.
*/
export class ZoneAwareEffectScheduler {
constructor() {
this.queuedEffectCount = 0;
this.queues = new Map();
this.pendingTasks = inject(PendingTasks);
this.taskId = null;
}
scheduleEffect(handle) {
this.enqueue(handle);
if (this.taskId === null) {
const taskId = (this.taskId = this.pendingTasks.add());
queueMicrotask(() => {
this.flush();
this.pendingTasks.remove(taskId);
this.taskId = null;
});
}
}
enqueue(handle) {
const zone = handle.creationZone;
if (!this.queues.has(zone)) {
this.queues.set(zone, new Set());
}
const queue = this.queues.get(zone);
if (queue.has(handle)) {
return;
}
this.queuedEffectCount++;
queue.add(handle);
}
/**
* Run all scheduled effects.
*
* Execution order of effects within the same zone is guaranteed to be FIFO, but there is no
* ordering guarantee between effects scheduled in different zones.
*/
flush() {
while (this.queuedEffectCount > 0) {
for (const [zone, queue] of this.queues) {
// `zone` here must be defined.
if (zone === null) {
this.flushQueue(queue);
}
else {
zone.run(() => this.flushQueue(queue));
}
}
}
}
flushQueue(queue) {
for (const handle of queue) {
queue.delete(handle);
this.queuedEffectCount--;
// TODO: what happens if this throws an error?
handle.run();
}
}
}
/**
* Core reactive node for an Angular effect.
*
* `EffectHandle` combines the reactive graph's `Watch` base node for effects with the framework's
* scheduling abstraction (`EffectScheduler`) as well as automatic cleanup via `DestroyRef` if
* available/requested.
*/
class EffectHandle {
constructor(scheduler, effectFn, creationZone, destroyRef, injector, allowSignalWrites) {
this.scheduler = scheduler;
this.effectFn = effectFn;
this.creationZone = creationZone;
this.injector = injector;
this.watcher = createWatch((onCleanup) => this.runEffect(onCleanup), () => this.schedule(), allowSignalWrites);
this.unregisterOnDestroy = destroyRef?.onDestroy(() => this.destroy());
}
runEffect(onCleanup) {
try {
this.effectFn(onCleanup);
}
catch (err) {
// Inject the `ErrorHandler` here in order to avoid circular DI error
// if the effect is used inside of a custom `ErrorHandler`.
const errorHandler = this.injector.get(ErrorHandler, null, { optional: true });
errorHandler?.handleError(err);
}
}
run() {
this.watcher.run();
}
schedule() {
this.scheduler.scheduleEffect(this);
}
destroy() {
this.watcher.destroy();
this.unregisterOnDestroy?.();
// Note: if the effect is currently scheduled, it's not un-scheduled, and so the scheduler will
// retain a reference to it. Attempting to execute it will be a no-op.
}
}
/**
* Create a global `Effect` for the given reactive function.
*
* @developerPreview
*/
export function effect(effectFn, options) {
performanceMarkFeature('NgSignals');
ngDevMode &&
assertNotInReactiveContext(effect, 'Call `effect` outside of a reactive context. For example, schedule the ' +
'effect inside the component constructor.');
!options?.injector && assertInInjectionContext(effect);
const injector = options?.injector ?? inject(Injector);
const destroyRef = options?.manualCleanup !== true ? injector.get(DestroyRef) : null;
const handle = new EffectHandle(injector.get(APP_EFFECT_SCHEDULER), effectFn, typeof Zone === 'undefined' ? null : Zone.current, destroyRef, injector, options?.allowSignalWrites ?? false);
// Effects need to be marked dirty manually to trigger their initial run. The timing of this
// marking matters, because the effects may read signals that track component inputs, which are
// only available after those components have had their first update pass.
//
// We inject `ChangeDetectorRef` optionally, to determine whether this effect is being created in
// the context of a component or not. If it is, then we check whether the component has already
// run its update pass, and defer the effect's initial scheduling until the update pass if it
// hasn't already run.
const cdr = injector.get(ChangeDetectorRef, null, { optional: true });
if (!cdr || !(cdr._lView[FLAGS] & 8 /* LViewFlags.FirstLViewPass */)) {
// This effect is either not running in a view injector, or the view has already
// undergone its first change detection pass, which is necessary for any required inputs to be
// set.
handle.watcher.notify();
}
else {
// Delay the initialization of the effect until the view is fully initialized.
(cdr._lView[EFFECTS_TO_SCHEDULE] ??= []).push(handle.watcher.notify);
}
return handle;
}
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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 {createWatch, Watch, WatchCleanupRegisterFn} from '@angular/core/primitives/signals';\n\nimport {ChangeDetectorRef} from '../../change_detection';\nimport {assertInInjectionContext} from '../../di/contextual';\nimport {InjectionToken} from '../../di/injection_token';\nimport {Injector} from '../../di/injector';\nimport {inject} from '../../di/injector_compatibility';\nimport {ɵɵdefineInjectable} from '../../di/interface/defs';\nimport {ErrorHandler} from '../../error_handler';\nimport type {ViewRef} from '../view_ref';\nimport {DestroyRef} from '../../linker/destroy_ref';\nimport {FLAGS, LViewFlags, EFFECTS_TO_SCHEDULE} from '../interfaces/view';\n\nimport {assertNotInReactiveContext} from './asserts';\nimport {performanceMarkFeature} from '../../util/performance';\nimport {PendingTasks} from '../../pending_tasks';\n\n/**\n * An effect can, optionally, register a cleanup function. If registered, the cleanup is executed\n * before the next effect run. The cleanup function makes it possible to \"cancel\" any work that the\n * previous effect run might have started.\n *\n * @developerPreview\n */\nexport type EffectCleanupFn = () => void;\n\n/**\n * A callback passed to the effect function that makes it possible to register cleanup logic.\n *\n * @developerPreview\n */\nexport type EffectCleanupRegisterFn = (cleanupFn: EffectCleanupFn) => void;\n\nexport interface SchedulableEffect {\n  run(): void;\n  creationZone: unknown;\n}\n\n/**\n * Not public API, which guarantees `EffectScheduler` only ever comes from the application root\n * injector.\n */\nexport const APP_EFFECT_SCHEDULER = new InjectionToken('', {\n  providedIn: 'root',\n  factory: () => inject(EffectScheduler),\n});\n\n/**\n * A scheduler which manages the execution of effects.\n */\nexport abstract class EffectScheduler {\n  /**\n   * Schedule the given effect to be executed at a later time.\n   *\n   * It is an error to attempt to execute any effects synchronously during a scheduling operation.\n   */\n  abstract scheduleEffect(e: SchedulableEffect): void;\n\n  /**\n   * Run any scheduled effects.\n   */\n  abstract flush(): void;\n\n  /** @nocollapse */\n  static ɵprov = /** @pureOrBreakMyCode */ ɵɵdefineInjectable({\n    token: EffectScheduler,\n    providedIn: 'root',\n    factory: () => new ZoneAwareEffectScheduler(),\n  });\n}\n\n/**\n * A wrapper around `ZoneAwareQueueingScheduler` that schedules flushing via the microtask queue\n * when.\n */\nexport class ZoneAwareEffectScheduler implements EffectScheduler {\n  private queuedEffectCount = 0;\n  private queues = new Map<Zone | null, Set<SchedulableEffect>>();\n  private readonly pendingTasks = inject(PendingTasks);\n  private taskId: number | null = null;\n\n  scheduleEffect(handle: SchedulableEffect): void {\n    this.enqueue(handle);\n\n    if (this.taskId === null) {\n      const taskId = (this.taskId = this.pendingTasks.add());\n      queueMicrotask(() => {\n        this.flush();\n        this.pendingTasks.remove(taskId);\n        this.taskId = null;\n      });\n    }\n  }\n\n  private enqueue(handle: SchedulableEffect): void {\n    const zone = handle.creationZone as Zone | null;\n    if (!this.queues.has(zone)) {\n      this.queues.set(zone, new Set());\n    }\n\n    const queue = this.queues.get(zone)!;\n    if (queue.has(handle)) {\n      return;\n    }\n    this.queuedEffectCount++;\n    queue.add(handle);\n  }\n\n  /**\n   * Run all scheduled effects.\n   *\n   * Execution order of effects within the same zone is guaranteed to be FIFO, but there is no\n   * ordering guarantee between effects scheduled in different zones.\n   */\n  flush(): void {\n    while (this.queuedEffectCount > 0) {\n      for (const [zone, queue] of this.queues) {\n        // `zone` here must be defined.\n        if (zone === null) {\n          this.flushQueue(queue);\n        } else {\n          zone.run(() => this.flushQueue(queue));\n        }\n      }\n    }\n  }\n\n  private flushQueue(queue: Set<SchedulableEffect>): void {\n    for (const handle of queue) {\n      queue.delete(handle);\n      this.queuedEffectCount--;\n\n      // TODO: what happens if this throws an error?\n      handle.run();\n    }\n  }\n}\n\n/**\n * Core reactive node for an Angular effect.\n *\n * `EffectHandle` combines the reactive graph's `Watch` base node for effects with the framework's\n * scheduling abstraction (`EffectScheduler`) as well as automatic cleanup via `DestroyRef` if\n * available/requested.\n */\nclass EffectHandle implements EffectRef, SchedulableEffect {\n  unregisterOnDestroy: (() => void) | undefined;\n  readonly watcher: Watch;\n\n  constructor(\n    private scheduler: EffectScheduler,\n    private effectFn: (onCleanup: EffectCleanupRegisterFn) => void,\n    public creationZone: Zone | null,\n    destroyRef: DestroyRef | null,\n    private injector: Injector,\n    allowSignalWrites: boolean,\n  ) {\n    this.watcher = createWatch(\n      (onCleanup) => this.runEffect(onCleanup),\n      () => this.schedule(),\n      allowSignalWrites,\n    );\n    this.unregisterOnDestroy = destroyRef?.onDestroy(() => this.destroy());\n  }\n\n  private runEffect(onCleanup: WatchCleanupRegisterFn): void {\n    try {\n      this.effectFn(onCleanup);\n    } catch (err) {\n      // Inject the `ErrorHandler` here in order to avoid circular DI error\n      // if the effect is used inside of a custom `ErrorHandler`.\n      const errorHandler = this.injector.get(ErrorHandler, null, {optional: true});\n      errorHandler?.handleError(err);\n    }\n  }\n\n  run(): void {\n    this.watcher.run();\n  }\n\n  private schedule(): void {\n    this.scheduler.scheduleEffect(this);\n  }\n\n  destroy(): void {\n    this.watcher.destroy();\n    this.unregisterOnDestroy?.();\n\n    // Note: if the effect is currently scheduled, it's not un-scheduled, and so the scheduler will\n    // retain a reference to it. Attempting to execute it will be a no-op.\n  }\n}\n\n/**\n * A global reactive effect, which can be manually destroyed.\n *\n * @developerPreview\n */\nexport interface EffectRef {\n  /**\n   * Shut down the effect, removing it from any upcoming scheduled executions.\n   */\n  destroy(): void;\n}\n\n/**\n * Options passed to the `effect` function.\n *\n * @developerPreview\n */\nexport interface CreateEffectOptions {\n  /**\n   * The `Injector` in which to create the effect.\n   *\n   * If this is not provided, the current [injection context](guide/di/dependency-injection-context)\n   * will be used instead (via `inject`).\n   */\n  injector?: Injector;\n\n  /**\n   * Whether the `effect` should require manual cleanup.\n   *\n   * If this is `false` (the default) the effect will automatically register itself to be cleaned up\n   * with the current `DestroyRef`.\n   */\n  manualCleanup?: boolean;\n\n  /**\n   * Whether the `effect` should allow writing to signals.\n   *\n   * Using effects to synchronize data by writing to signals can lead to confusing and potentially\n   * incorrect behavior, and should be enabled only when necessary.\n   */\n  allowSignalWrites?: boolean;\n}\n\n/**\n * Create a global `Effect` for the given reactive function.\n *\n * @developerPreview\n */\nexport function effect(\n  effectFn: (onCleanup: EffectCleanupRegisterFn) => void,\n  options?: CreateEffectOptions,\n): EffectRef {\n  performanceMarkFeature('NgSignals');\n  ngDevMode &&\n    assertNotInReactiveContext(\n      effect,\n      'Call `effect` outside of a reactive context. For example, schedule the ' +\n        'effect inside the component constructor.',\n    );\n\n  !options?.injector && assertInInjectionContext(effect);\n  const injector = options?.injector ?? inject(Injector);\n  const destroyRef = options?.manualCleanup !== true ? injector.get(DestroyRef) : null;\n\n  const handle = new EffectHandle(\n    injector.get(APP_EFFECT_SCHEDULER),\n    effectFn,\n    typeof Zone === 'undefined' ? null : Zone.current,\n    destroyRef,\n    injector,\n    options?.allowSignalWrites ?? false,\n  );\n\n  // Effects need to be marked dirty manually to trigger their initial run. The timing of this\n  // marking matters, because the effects may read signals that track component inputs, which are\n  // only available after those components have had their first update pass.\n  //\n  // We inject `ChangeDetectorRef` optionally, to determine whether this effect is being created in\n  // the context of a component or not. If it is, then we check whether the component has already\n  // run its update pass, and defer the effect's initial scheduling until the update pass if it\n  // hasn't already run.\n  const cdr = injector.get(ChangeDetectorRef, null, {optional: true}) as ViewRef<unknown> | null;\n  if (!cdr || !(cdr._lView[FLAGS] & LViewFlags.FirstLViewPass)) {\n    // This effect is either not running in a view injector, or the view has already\n    // undergone its first change detection pass, which is necessary for any required inputs to be\n    // set.\n    handle.watcher.notify();\n  } else {\n    // Delay the initialization of the effect until the view is fully initialized.\n    (cdr._lView[EFFECTS_TO_SCHEDULE] ??= []).push(handle.watcher.notify);\n  }\n\n  return handle;\n}\n"]}