@angular/core
Version:
Angular - the core framework
201 lines • 26.4 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 { ɵɵdefineInjectable } from '../di';
import { INJECTOR } from '../render3/interfaces/view';
import { arrayInsert2, arraySplice } from '../util/array_utils';
/**
* Returns a function that captures a provided delay.
* Invoking the returned function schedules a trigger.
*/
export function onTimer(delay) {
return (callback, lView) => scheduleTimerTrigger(delay, callback, lView);
}
/**
* Schedules a callback to be invoked after a given timeout.
*
* @param delay A number of ms to wait until firing a callback.
* @param callback A function to be invoked after a timeout.
* @param lView LView that hosts an instance of a defer block.
*/
export function scheduleTimerTrigger(delay, callback, lView) {
const injector = lView[INJECTOR];
const scheduler = injector.get(TimerScheduler);
const cleanupFn = () => scheduler.remove(callback);
scheduler.add(delay, callback);
return cleanupFn;
}
/**
* Helper service to schedule `setTimeout`s for batches of defer blocks,
* to avoid calling `setTimeout` for each defer block (e.g. if defer blocks
* are created inside a for loop).
*/
export class TimerScheduler {
constructor() {
// Indicates whether current callbacks are being invoked.
this.executingCallbacks = false;
// Currently scheduled `setTimeout` id.
this.timeoutId = null;
// When currently scheduled timer would fire.
this.invokeTimerAt = null;
// List of callbacks to be invoked.
// For each callback we also store a timestamp on when the callback
// should be invoked. We store timestamps and callback functions
// in a flat array to avoid creating new objects for each entry.
// [timestamp1, callback1, timestamp2, callback2, ...]
this.current = [];
// List of callbacks collected while invoking current set of callbacks.
// Those callbacks are added to the "current" queue at the end of
// the current callback invocation. The shape of this list is the same
// as the shape of the `current` list.
this.deferred = [];
}
add(delay, callback) {
const target = this.executingCallbacks ? this.deferred : this.current;
this.addToQueue(target, Date.now() + delay, callback);
this.scheduleTimer();
}
remove(callback) {
const { current, deferred } = this;
const callbackIndex = this.removeFromQueue(current, callback);
if (callbackIndex === -1) {
// Try cleaning up deferred queue only in case
// we didn't find a callback in the "current" queue.
this.removeFromQueue(deferred, callback);
}
// If the last callback was removed and there is a pending timeout - cancel it.
if (current.length === 0 && deferred.length === 0) {
this.clearTimeout();
}
}
addToQueue(target, invokeAt, callback) {
let insertAtIndex = target.length;
for (let i = 0; i < target.length; i += 2) {
const invokeQueuedCallbackAt = target[i];
if (invokeQueuedCallbackAt > invokeAt) {
// We've reached a first timer that is scheduled
// for a later time than what we are trying to insert.
// This is the location at which we need to insert,
// no need to iterate further.
insertAtIndex = i;
break;
}
}
arrayInsert2(target, insertAtIndex, invokeAt, callback);
}
removeFromQueue(target, callback) {
let index = -1;
for (let i = 0; i < target.length; i += 2) {
const queuedCallback = target[i + 1];
if (queuedCallback === callback) {
index = i;
break;
}
}
if (index > -1) {
// Remove 2 elements: a timestamp slot and
// the following slot with a callback function.
arraySplice(target, index, 2);
}
return index;
}
scheduleTimer() {
const callback = () => {
this.clearTimeout();
this.executingCallbacks = true;
// Clone the current state of the queue, since it might be altered
// as we invoke callbacks.
const current = [...this.current];
// Invoke callbacks that were scheduled to run before the current time.
const now = Date.now();
for (let i = 0; i < current.length; i += 2) {
const invokeAt = current[i];
const callback = current[i + 1];
if (invokeAt <= now) {
callback();
}
else {
// We've reached a timer that should not be invoked yet.
break;
}
}
// The state of the queue might've changed after callbacks invocation,
// run the cleanup logic based on the *current* state of the queue.
let lastCallbackIndex = -1;
for (let i = 0; i < this.current.length; i += 2) {
const invokeAt = this.current[i];
if (invokeAt <= now) {
// Add +1 to account for a callback function that
// goes after the timestamp in events array.
lastCallbackIndex = i + 1;
}
else {
// We've reached a timer that should not be invoked yet.
break;
}
}
if (lastCallbackIndex >= 0) {
arraySplice(this.current, 0, lastCallbackIndex + 1);
}
this.executingCallbacks = false;
// If there are any callbacks added during an invocation
// of the current ones - move them over to the "current"
// queue.
if (this.deferred.length > 0) {
for (let i = 0; i < this.deferred.length; i += 2) {
const invokeAt = this.deferred[i];
const callback = this.deferred[i + 1];
this.addToQueue(this.current, invokeAt, callback);
}
this.deferred.length = 0;
}
this.scheduleTimer();
};
// Avoid running timer callbacks more than once per
// average frame duration. This is needed for better
// batching and to avoid kicking off excessive change
// detection cycles.
const FRAME_DURATION_MS = 16; // 1000ms / 60fps
if (this.current.length > 0) {
const now = Date.now();
// First element in the queue points at the timestamp
// of the first (earliest) event.
const invokeAt = this.current[0];
if (this.timeoutId === null ||
// Reschedule a timer in case a queue contains an item with
// an earlier timestamp and the delta is more than an average
// frame duration.
(this.invokeTimerAt && this.invokeTimerAt - invokeAt > FRAME_DURATION_MS)) {
// There was a timeout already, but an earlier event was added
// into the queue. In this case we drop an old timer and setup
// a new one with an updated (smaller) timeout.
this.clearTimeout();
const timeout = Math.max(invokeAt - now, FRAME_DURATION_MS);
this.invokeTimerAt = invokeAt;
this.timeoutId = setTimeout(callback, timeout);
}
}
}
clearTimeout() {
if (this.timeoutId !== null) {
clearTimeout(this.timeoutId);
this.timeoutId = null;
}
}
ngOnDestroy() {
this.clearTimeout();
this.current.length = 0;
this.deferred.length = 0;
}
/** @nocollapse */
static { this.ɵprov = ɵɵdefineInjectable({
token: TimerScheduler,
providedIn: 'root',
factory: () => new TimerScheduler(),
}); }
}
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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 {ɵɵdefineInjectable} from '../di';\nimport {INJECTOR, LView} from '../render3/interfaces/view';\nimport {arrayInsert2, arraySplice} from '../util/array_utils';\n\n/**\n * Returns a function that captures a provided delay.\n * Invoking the returned function schedules a trigger.\n */\nexport function onTimer(delay: number) {\n  return (callback: VoidFunction, lView: LView) => scheduleTimerTrigger(delay, callback, lView);\n}\n\n/**\n * Schedules a callback to be invoked after a given timeout.\n *\n * @param delay A number of ms to wait until firing a callback.\n * @param callback A function to be invoked after a timeout.\n * @param lView LView that hosts an instance of a defer block.\n */\nexport function scheduleTimerTrigger(delay: number, callback: VoidFunction, lView: LView) {\n  const injector = lView[INJECTOR]!;\n  const scheduler = injector.get(TimerScheduler);\n  const cleanupFn = () => scheduler.remove(callback);\n  scheduler.add(delay, callback);\n  return cleanupFn;\n}\n\n/**\n * Helper service to schedule `setTimeout`s for batches of defer blocks,\n * to avoid calling `setTimeout` for each defer block (e.g. if defer blocks\n * are created inside a for loop).\n */\nexport class TimerScheduler {\n  // Indicates whether current callbacks are being invoked.\n  executingCallbacks = false;\n\n  // Currently scheduled `setTimeout` id.\n  timeoutId: number | null = null;\n\n  // When currently scheduled timer would fire.\n  invokeTimerAt: number | null = null;\n\n  // List of callbacks to be invoked.\n  // For each callback we also store a timestamp on when the callback\n  // should be invoked. We store timestamps and callback functions\n  // in a flat array to avoid creating new objects for each entry.\n  // [timestamp1, callback1, timestamp2, callback2, ...]\n  current: Array<number | VoidFunction> = [];\n\n  // List of callbacks collected while invoking current set of callbacks.\n  // Those callbacks are added to the \"current\" queue at the end of\n  // the current callback invocation. The shape of this list is the same\n  // as the shape of the `current` list.\n  deferred: Array<number | VoidFunction> = [];\n\n  add(delay: number, callback: VoidFunction) {\n    const target = this.executingCallbacks ? this.deferred : this.current;\n    this.addToQueue(target, Date.now() + delay, callback);\n    this.scheduleTimer();\n  }\n\n  remove(callback: VoidFunction) {\n    const {current, deferred} = this;\n    const callbackIndex = this.removeFromQueue(current, callback);\n    if (callbackIndex === -1) {\n      // Try cleaning up deferred queue only in case\n      // we didn't find a callback in the \"current\" queue.\n      this.removeFromQueue(deferred, callback);\n    }\n    // If the last callback was removed and there is a pending timeout - cancel it.\n    if (current.length === 0 && deferred.length === 0) {\n      this.clearTimeout();\n    }\n  }\n\n  private addToQueue(\n    target: Array<number | VoidFunction>,\n    invokeAt: number,\n    callback: VoidFunction,\n  ) {\n    let insertAtIndex = target.length;\n    for (let i = 0; i < target.length; i += 2) {\n      const invokeQueuedCallbackAt = target[i] as number;\n      if (invokeQueuedCallbackAt > invokeAt) {\n        // We've reached a first timer that is scheduled\n        // for a later time than what we are trying to insert.\n        // This is the location at which we need to insert,\n        // no need to iterate further.\n        insertAtIndex = i;\n        break;\n      }\n    }\n    arrayInsert2(target, insertAtIndex, invokeAt, callback);\n  }\n\n  private removeFromQueue(target: Array<number | VoidFunction>, callback: VoidFunction) {\n    let index = -1;\n    for (let i = 0; i < target.length; i += 2) {\n      const queuedCallback = target[i + 1];\n      if (queuedCallback === callback) {\n        index = i;\n        break;\n      }\n    }\n    if (index > -1) {\n      // Remove 2 elements: a timestamp slot and\n      // the following slot with a callback function.\n      arraySplice(target, index, 2);\n    }\n    return index;\n  }\n\n  private scheduleTimer() {\n    const callback = () => {\n      this.clearTimeout();\n\n      this.executingCallbacks = true;\n\n      // Clone the current state of the queue, since it might be altered\n      // as we invoke callbacks.\n      const current = [...this.current];\n\n      // Invoke callbacks that were scheduled to run before the current time.\n      const now = Date.now();\n      for (let i = 0; i < current.length; i += 2) {\n        const invokeAt = current[i] as number;\n        const callback = current[i + 1] as VoidFunction;\n        if (invokeAt <= now) {\n          callback();\n        } else {\n          // We've reached a timer that should not be invoked yet.\n          break;\n        }\n      }\n      // The state of the queue might've changed after callbacks invocation,\n      // run the cleanup logic based on the *current* state of the queue.\n      let lastCallbackIndex = -1;\n      for (let i = 0; i < this.current.length; i += 2) {\n        const invokeAt = this.current[i] as number;\n        if (invokeAt <= now) {\n          // Add +1 to account for a callback function that\n          // goes after the timestamp in events array.\n          lastCallbackIndex = i + 1;\n        } else {\n          // We've reached a timer that should not be invoked yet.\n          break;\n        }\n      }\n      if (lastCallbackIndex >= 0) {\n        arraySplice(this.current, 0, lastCallbackIndex + 1);\n      }\n\n      this.executingCallbacks = false;\n\n      // If there are any callbacks added during an invocation\n      // of the current ones - move them over to the \"current\"\n      // queue.\n      if (this.deferred.length > 0) {\n        for (let i = 0; i < this.deferred.length; i += 2) {\n          const invokeAt = this.deferred[i] as number;\n          const callback = this.deferred[i + 1] as VoidFunction;\n          this.addToQueue(this.current, invokeAt, callback);\n        }\n        this.deferred.length = 0;\n      }\n      this.scheduleTimer();\n    };\n\n    // Avoid running timer callbacks more than once per\n    // average frame duration. This is needed for better\n    // batching and to avoid kicking off excessive change\n    // detection cycles.\n    const FRAME_DURATION_MS = 16; // 1000ms / 60fps\n\n    if (this.current.length > 0) {\n      const now = Date.now();\n      // First element in the queue points at the timestamp\n      // of the first (earliest) event.\n      const invokeAt = this.current[0] as number;\n      if (\n        this.timeoutId === null ||\n        // Reschedule a timer in case a queue contains an item with\n        // an earlier timestamp and the delta is more than an average\n        // frame duration.\n        (this.invokeTimerAt && this.invokeTimerAt - invokeAt > FRAME_DURATION_MS)\n      ) {\n        // There was a timeout already, but an earlier event was added\n        // into the queue. In this case we drop an old timer and setup\n        // a new one with an updated (smaller) timeout.\n        this.clearTimeout();\n\n        const timeout = Math.max(invokeAt - now, FRAME_DURATION_MS);\n        this.invokeTimerAt = invokeAt;\n        this.timeoutId = setTimeout(callback, timeout) as unknown as number;\n      }\n    }\n  }\n\n  private clearTimeout() {\n    if (this.timeoutId !== null) {\n      clearTimeout(this.timeoutId);\n      this.timeoutId = null;\n    }\n  }\n\n  ngOnDestroy() {\n    this.clearTimeout();\n    this.current.length = 0;\n    this.deferred.length = 0;\n  }\n\n  /** @nocollapse */\n  static ɵprov = /** @pureOrBreakMyCode */ ɵɵdefineInjectable({\n    token: TimerScheduler,\n    providedIn: 'root',\n    factory: () => new TimerScheduler(),\n  });\n}\n"]}