@ampush/centaurus/queue.js

Centaurus, is an Ampush repository designed to house common UI components, JS classes, templates and API methods in a central place that can be imported and reused across other Ampush partner repositories as needed.

const Queue = () => {
    const queue = [];
    let workingOnPromise = false;
    const enqueue = (promise) => {
        return new Promise((resolve, reject) => {
            queue.push({
                promise,
                resolve,
                reject,
            });
        });
    };
    const dequeue = () => {
        if (workingOnPromise) {
            return false;
        }
        const item = queue.shift();
        if (!item) {
            return false;
        }
        try {
            workingOnPromise = true;
            item
                .promise()
                .then((value) => {
                workingOnPromise = false;
                item.resolve(value);
                dequeue();
            })
                .catch((err) => {
                workingOnPromise = false;
                item.reject(err);
                dequeue();
            });
        }
        catch (err) {
            workingOnPromise = false;
            item.reject(err);
            dequeue();
        }
        return true;
    };
    return {
        enqueue,
        dequeue,
    };
};

export default Queue;