@studiometa/js-toolkit/utils/Queue.js

A set of useful little bits of JavaScript to boost your project! 🚀

class Queue {
  /**
   * List of tasks.
   */
  tasks = [];
  /**
   * Number of tasks running in a single batch.
   */
  concurrency = 10;
  /**
   * A function to schedule the next batch.
   */
  waiter;
  /**
   * Is schedule running?
   */
  isScheduled = false;
  /**
   * Constructor.
   *
   * @param {number} concurrency Number of tasks running in a single batch.
   * @param {(cb: (...args:unknown[]) => unknown) => unknown} waiter Scheduler for the next batch execution.
   */
  constructor(concurrency, waiter = (cb) => cb()) {
    this.concurrency = concurrency;
    this.waiter = waiter;
  }
  /**
   * Add a task to the queue.
   */
  add(task) {
    const p = new Promise((resolve) => {
      this.tasks.push(() => resolve(task()));
    });
    this.scheduleFlush();
    return p;
  }
  /**
   * Schedule next flush.
   */
  scheduleFlush() {
    if (this.isScheduled) {
      return;
    }
    this.isScheduled = true;
    this.waiter(() => this.flush());
  }
  /**
   * Flush current batch.
   */
  flush() {
    this.run(this.tasks.splice(0, this.concurrency));
    this.isScheduled = false;
    if (this.tasks.length > 0) {
      this.scheduleFlush();
    }
  }
  /**
   * Run the queue.
   */
  run(tasks) {
    let task;
    while (task = tasks.shift()) {
      task();
    }
  }
}
export {
  Queue
};
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