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44 lines
1.6 KiB
44 lines
1.6 KiB
2 years ago
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/**
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* An execution context and a data structure to order tasks and schedule their
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* execution. Provides a notion of (potentially virtual) time, through the
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* `now()` getter method.
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*
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* Each unit of work in a Scheduler is called an {@link Action}.
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*
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* ```ts
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* class Scheduler {
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* now(): number;
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* schedule(work, delay?, state?): Subscription;
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* }
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* ```
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*
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* @class Scheduler
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*/
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export class Scheduler {
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constructor(SchedulerAction, now = Scheduler.now) {
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this.SchedulerAction = SchedulerAction;
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this.now = now;
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}
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/**
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* Schedules a function, `work`, for execution. May happen at some point in
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* the future, according to the `delay` parameter, if specified. May be passed
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* some context object, `state`, which will be passed to the `work` function.
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*
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* The given arguments will be processed an stored as an Action object in a
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* queue of actions.
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*
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* @param {function(state: ?T): ?Subscription} work A function representing a
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* task, or some unit of work to be executed by the Scheduler.
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* @param {number} [delay] Time to wait before executing the work, where the
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* time unit is implicit and defined by the Scheduler itself.
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* @param {T} [state] Some contextual data that the `work` function uses when
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* called by the Scheduler.
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* @return {Subscription} A subscription in order to be able to unsubscribe
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* the scheduled work.
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*/
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schedule(work, delay = 0, state) {
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return new this.SchedulerAction(this, work).schedule(state, delay);
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}
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}
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Scheduler.now = Date.now ? Date.now : () => +new Date();
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//# sourceMappingURL=Scheduler.js.map
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