igir/dist/src/async/mappableSemaphore.js

🕹 A zero-setup ROM collection manager that sorts, filters, extracts or archives, patches, and reports on collections of any size on any OS.

import async from 'async';
import { Semaphore } from 'async-mutex';
/**
 * A wrapper for an `async-mutex` {@link Semaphore} that allows mapping over an array of values.
 */
export default class MappableSemaphore extends Semaphore {
    threads;
    constructor(threads) {
        super(threads);
        this.threads = threads;
    }
    /**
     * Run some {@link callback}. for every {@link values}.
     */
    async map(values, callback) {
        if (values.length === 0) {
            // Don't incur any semaphore overhead
            return [];
        }
        return async.mapLimit(values, Math.floor(this.threads * 1.5), async (value) => this.runExclusive(async () => callback(value)));
    }
}