torrent-api-ts/dist/lib/Queue/PromiseThrottler.js

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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const QueuedPromise_1 = require("./QueuedPromise");
/**
 * Throttle the promise and only execute them one at a time
 */
class PromiseThrottler {
    /**
     *
     * @param {number} delayBetweenPromise in milliseconds
     */
    constructor(delayBetweenPromise) {
        this._queue = [];
        this._lastStart = 0;
        this._delayBetweenPromise = delayBetweenPromise;
    }
    /**
     * Delay between promises
     * @param {number} value
     */
    set delayBetweenPromise(value) {
        this._delayBetweenPromise = value;
    }
    /**
     * Add a promise to the queue
     * @param {PromiseFactory<T>} promiseFactory
     * @returns {Promise<T>}
     */
    add(promiseFactory) {
        return new Promise((resolve, reject) => {
            this._queue.push(new QueuedPromise_1.QueuedPromise(resolve, reject, promiseFactory));
            this._dequeue();
        });
    }
    _dequeue() {
        if (this._queue.length === 0) {
            return;
        }
        const elapsedTime = Date.now() - this._lastStart;
        if (elapsedTime < this._delayBetweenPromise) {
            setTimeout(() => this._dequeue(), this._delayBetweenPromise - elapsedTime);
            return;
        }
        this._execute();
    }
    _execute() {
        const selected = this._queue.shift();
        if (!selected) {
            return;
        }
        this._lastStart = Date.now();
        selected.execute();
    }
}
exports.PromiseThrottler = PromiseThrottler;
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