import { AsyncAction } from './AsyncAction';
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import { Subscription } from '../Subscription';
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import { AsyncScheduler } from './AsyncScheduler';
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import { SchedulerAction } from '../types';
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export class VirtualTimeScheduler extends AsyncScheduler {
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protected static frameTimeFactor: number = 10;
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public frame: number = 0;
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public index: number = -1;
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constructor(SchedulerAction: typeof AsyncAction = VirtualAction as any,
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public maxFrames: number = Number.POSITIVE_INFINITY) {
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super(SchedulerAction, () => this.frame);
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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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public flush(): void {
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const {actions, maxFrames} = this;
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let error: any, action: AsyncAction<any>;
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while ((action = actions[0]) && action.delay <= maxFrames) {
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actions.shift();
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this.frame = action.delay;
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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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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @nodoc
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*/
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export class VirtualAction<T> extends AsyncAction<T> {
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protected active: boolean = true;
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constructor(protected scheduler: VirtualTimeScheduler,
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protected work: (this: SchedulerAction<T>, state?: T) => void,
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protected index: number = scheduler.index += 1) {
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super(scheduler, work);
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this.index = scheduler.index = index;
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}
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public schedule(state?: T, delay: number = 0): Subscription {
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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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protected requestAsyncId(scheduler: VirtualTimeScheduler, id?: any, delay: number = 0): any {
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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 as Array<VirtualAction<T>>).sort(VirtualAction.sortActions);
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return true;
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}
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protected recycleAsyncId(scheduler: VirtualTimeScheduler, id?: any, delay: number = 0): any {
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return undefined;
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}
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protected _execute(state: T, delay: number): any {
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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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public static sortActions<T>(a: VirtualAction<T>, b: VirtualAction<T>) {
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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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} else if (a.index > b.index) {
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return 1;
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} else {
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return -1;
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}
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} else if (a.delay > b.delay) {
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return 1;
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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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