work.suroh.tk/node_modules/rxjs/_esm2015/Scheduler.js

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2019-12-02 12:22:45 +00:00
/**
* An execution context and a data structure to order tasks and schedule their
* execution. Provides a notion of (potentially virtual) time, through the
* `now()` getter method.
*
* Each unit of work in a Scheduler is called an {@link Action}.
*
* ```ts
* class Scheduler {
* now(): number;
* schedule(work, delay?, state?): Subscription;
* }
* ```
*
* @class Scheduler
*/
export class Scheduler {
constructor(SchedulerAction, now = Scheduler.now) {
this.SchedulerAction = SchedulerAction;
this.now = now;
}
/**
* Schedules a function, `work`, for execution. May happen at some point in
* the future, according to the `delay` parameter, if specified. May be passed
* some context object, `state`, which will be passed to the `work` function.
*
* The given arguments will be processed an stored as an Action object in a
* queue of actions.
*
* @param {function(state: ?T): ?Subscription} work A function representing a
* task, or some unit of work to be executed by the Scheduler.
* @param {number} [delay] Time to wait before executing the work, where the
* time unit is implicit and defined by the Scheduler itself.
* @param {T} [state] Some contextual data that the `work` function uses when
* called by the Scheduler.
* @return {Subscription} A subscription in order to be able to unsubscribe
* the scheduled work.
*/
schedule(work, delay = 0, state) {
return new this.SchedulerAction(this, work).schedule(state, delay);
}
}
Scheduler.now = Date.now ? Date.now : () => +new Date();
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