ember-concurrency/dist/-private/external/scheduler/scheduler.js

Improved concurrency/async primitives for Ember.js

import Refresh from './refresh.js';
import StateTracker from './state-tracker/state-tracker.js';
import NullStateTracker from './state-tracker/null-state-tracker.js';

// Scheduler base class

// When a Task is performed, it creates an unstarted TaskInstance and
// passes it to the Scheduler to determine when it should run. The
// scheduler consults the schedulerPolicy (e.g. DropPolicy, RestartablePolicy, etc)
// to determine whether the task instance should start executing, be enqueued
// for later execution, or be immediately cancelled. As TaskInstances start
// and run to completion, the Scheduler's `refresh()` method is called to
// give it an opportunity to start (or cancel) previously enqueued task instances,
// as well as update the derived state on Tasks and TaskGroups.

// Every Task has its own Scheduler instance, unless it is part of a group,
// in which case all the Tasks in a group share a single Scheduler.

class Scheduler {
  constructor(schedulerPolicy, stateTrackingEnabled) {
    this.schedulerPolicy = schedulerPolicy;
    this.stateTrackingEnabled = stateTrackingEnabled;
    this.taskInstances = [];
  }
  cancelAll(guid, cancelRequest) {
    let cancelations = this.taskInstances.map(taskInstance => {
      if (taskInstance.task.guids[guid]) {
        taskInstance.executor.cancel(cancelRequest);
      }
    }).filter(cancelation => !!cancelation);
    return Promise.all(cancelations);
  }
  perform(taskInstance) {
    taskInstance.onFinalize(() => this.scheduleRefresh());
    this.taskInstances.push(taskInstance);
    this.refresh();
  }
  scheduleRefresh() {
    Promise.resolve().then(() => this.refresh());
  }
  refresh() {
    let stateTracker = this.stateTrackingEnabled ? new StateTracker() : new NullStateTracker();
    let refresh = new Refresh(this.schedulerPolicy, stateTracker, this.taskInstances);
    this.taskInstances = refresh.process();
  }
}

export { Scheduler as default };
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