typed-utilities/build/AsyncLock.js

Strongly typed general purpose utilities

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.AsyncLock = void 0;

var _Deferred = require("./Deferred");

class AsyncLock {
  _length = 0;

  constructor() {
    this.queue = Promise.resolve();
    this._length = 0;
  }

  use = async fn => {
    this._length++;

    const deferred = _Deferred.Deferred.defer();

    this.queue = this.queue.finally(async () => {
      try {
        deferred.resolve(await fn());
      } catch (error) {
        deferred.reject(error);
      } finally {
        this._length--;
      }
    });
    return deferred.await();
  };

  get length() {
    return this._length;
  }

}

exports.AsyncLock = AsyncLock;
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