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import { AsyncAction } from './AsyncAction';
import { Subscription } from '../Subscription';
import { AsyncScheduler } from './AsyncScheduler';
import { SchedulerAction } from '../types';
import { TimerHandle } from './timerHandle';
export class VirtualTimeScheduler extends AsyncScheduler {
/** @deprecated Not used in VirtualTimeScheduler directly. Will be removed in v8. */
static frameTimeFactor = 10;
/**
* The current frame for the state of the virtual scheduler instance. The difference
* between two "frames" is synonymous with the passage of "virtual time units". So if
* you record `scheduler.frame` to be `1`, then later, observe `scheduler.frame` to be at `11`,
* that means `10` virtual time units have passed.
*/
public frame: number = 0;
/**
* Used internally to examine the current virtual action index being processed.
* @deprecated Internal implementation detail, do not use directly. Will be made internal in v8.
*/
public index: number = -1;
/**
* This creates an instance of a `VirtualTimeScheduler`. Experts only. The signature of
* this constructor is likely to change in the long run.
*
* @param schedulerActionCtor The type of Action to initialize when initializing actions during scheduling.
* @param maxFrames The maximum number of frames to process before stopping. Used to prevent endless flush cycles.
*/
constructor(schedulerActionCtor: typeof AsyncAction = VirtualAction as any, public maxFrames: number = Infinity) {
super(schedulerActionCtor, () => this.frame);
}
/**
* Prompt the Scheduler to execute all of its queued actions, therefore
* clearing its queue.
*/
public flush(): void {
const { actions, maxFrames } = this;
let error: any;
let action: AsyncAction<any> | undefined;
while ((action = actions[0]) && action.delay <= maxFrames) {
actions.shift();
this.frame = action.delay;
if ((error = action.execute(action.state, action.delay))) {
break;
}
}
if (error) {
while ((action = actions.shift())) {
action.unsubscribe();
}
throw error;
}
}
}
export class VirtualAction<T> extends AsyncAction<T> {
protected active: boolean = true;
constructor(
protected scheduler: VirtualTimeScheduler,
protected work: (this: SchedulerAction<T>, state?: T) => void,
protected index: number = (scheduler.index += 1)
) {
super(scheduler, work);
this.index = scheduler.index = index;
}
public schedule(state?: T, delay: number = 0): Subscription {
if (Number.isFinite(delay)) {
if (!this.id) {
return super.schedule(state, delay);
}
this.active = false;
// If an action is rescheduled, we save allocations by mutating its state,
// pushing it to the end of the scheduler queue, and recycling the action.
// But since the VirtualTimeScheduler is used for testing, VirtualActions
// must be immutable so they can be inspected later.
const action = new VirtualAction(this.scheduler, this.work);
this.add(action);
return action.schedule(state, delay);
} else {
// If someone schedules something with Infinity, it'll never happen. So we
// don't even schedule it.
return Subscription.EMPTY;
}
}
protected requestAsyncId(scheduler: VirtualTimeScheduler, id?: any, delay: number = 0): TimerHandle {
this.delay = scheduler.frame + delay;
const { actions } = scheduler;
actions.push(this);
(actions as Array<VirtualAction<T>>).sort(VirtualAction.sortActions);
return 1;
}
protected recycleAsyncId(scheduler: VirtualTimeScheduler, id?: any, delay: number = 0): TimerHandle | undefined {
return undefined;
}
protected _execute(state: T, delay: number): any {
if (this.active === true) {
return super._execute(state, delay);
}
}
private static sortActions<T>(a: VirtualAction<T>, b: VirtualAction<T>) {
if (a.delay === b.delay) {
if (a.index === b.index) {
return 0;
} else if (a.index > b.index) {
return 1;
} else {
return -1;
}
} else if (a.delay > b.delay) {
return 1;
} else {
return -1;
}
}
}