@node-pigpio/core/dist/utils/PromiseQueue.js

pigpiod client for node.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.PromiseQueue = void 0;
class PromiseQueue {
    constructor(maxPendingPromises = 1) {
        this.pendingPromises = 0;
        this.maxPendingPromises = 1;
        this.queue = [];
        this.maxPendingPromises = maxPendingPromises;
    }
    add(p) {
        return new Promise((resolve, reject) => {
            const pending = () => {
                p()
                    .then((v) => {
                    resolve(v);
                    this.pendingPromises -= 1;
                    this.dequeue();
                })
                    .catch((err) => {
                    reject(err);
                    this.pendingPromises -= 1;
                    this.dequeue();
                });
            };
            this.queue.push(pending);
            this.dequeue();
        });
    }
    dequeue() {
        if (this.pendingPromises >= this.maxPendingPromises) {
            return;
        }
        const item = this.queue.shift();
        if (!item) {
            return;
        }
        this.pendingPromises += 1;
        item();
    }
    getQueueLength() {
        return this.queue.length;
    }
    getPendingLength() {
        return this.pendingPromises;
    }
}
exports.PromiseQueue = PromiseQueue;
exports.default = { PromiseQueue };