94 lines
2.9 KiB
JavaScript
94 lines
2.9 KiB
JavaScript
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import { AsyncAction } from './AsyncAction';
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import { AsyncScheduler } from './AsyncScheduler';
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export class VirtualTimeScheduler extends AsyncScheduler {
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constructor(SchedulerAction = VirtualAction, maxFrames = Number.POSITIVE_INFINITY) {
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super(SchedulerAction, () => this.frame);
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this.maxFrames = maxFrames;
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this.frame = 0;
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this.index = -1;
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}
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/**
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* Prompt the Scheduler to execute all of its queued actions, therefore
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* clearing its queue.
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* @return {void}
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*/
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flush() {
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const { actions, maxFrames } = this;
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let error, action;
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while ((action = actions.shift()) && (this.frame = action.delay) <= maxFrames) {
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if (error = action.execute(action.state, action.delay)) {
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break;
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}
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}
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if (error) {
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while (action = actions.shift()) {
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action.unsubscribe();
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}
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throw error;
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}
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}
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}
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VirtualTimeScheduler.frameTimeFactor = 10;
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @ignore
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* @extends {Ignored}
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*/
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export class VirtualAction extends AsyncAction {
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constructor(scheduler, work, index = scheduler.index += 1) {
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super(scheduler, work);
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this.scheduler = scheduler;
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this.work = work;
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this.index = index;
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this.active = true;
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this.index = scheduler.index = index;
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}
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schedule(state, delay = 0) {
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if (!this.id) {
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return super.schedule(state, delay);
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}
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this.active = false;
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// If an action is rescheduled, we save allocations by mutating its state,
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// pushing it to the end of the scheduler queue, and recycling the action.
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// But since the VirtualTimeScheduler is used for testing, VirtualActions
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// must be immutable so they can be inspected later.
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const action = new VirtualAction(this.scheduler, this.work);
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this.add(action);
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return action.schedule(state, delay);
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}
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requestAsyncId(scheduler, id, delay = 0) {
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this.delay = scheduler.frame + delay;
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const { actions } = scheduler;
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actions.push(this);
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actions.sort(VirtualAction.sortActions);
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return true;
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}
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recycleAsyncId(scheduler, id, delay = 0) {
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return undefined;
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}
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_execute(state, delay) {
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if (this.active === true) {
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return super._execute(state, delay);
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}
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}
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static sortActions(a, b) {
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if (a.delay === b.delay) {
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if (a.index === b.index) {
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return 0;
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}
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else if (a.index > b.index) {
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return 1;
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}
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else {
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return -1;
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}
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}
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else if (a.delay > b.delay) {
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return 1;
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}
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else {
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return -1;
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}
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}
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}
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//# sourceMappingURL=VirtualTimeScheduler.js.map
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