@shutterstock/p-map-iterable/dist/src/iterable-queue.js

Set of classes used for async prefetching with backpressure (IterableMapper) and async flushing with backpressure (IterableQueueMapper, IterableQueueMapperSimple)

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.IterableQueue = void 0;
const blocking_queue_1 = require("./blocking-queue");
/**
 * Exposes an `AsyncIterable` interface for the `BlockingQueue`.
 *
 * @category Low-Level
 */
class IterableQueue extends blocking_queue_1.BlockingQueue {
    /**
     * Create a new `IterableQueue`
     * @param options IterableQueue options
     */
    constructor(options = {}) {
        super(options);
    }
    [Symbol.asyncIterator]() {
        return this;
    }
    /**
     * Used by the iterator returned from [Symbol.asyncIterator]
     * Called every time an item is needed
     *
     * @returns Iterator result
     */
    async next() {
        // Check if queue has an item
        const item = await this.dequeue();
        if (item === undefined) {
            // We finished - There were no more items
            return { value: undefined, done: true };
        }
        return { value: item, done: false };
    }
}
exports.IterableQueue = IterableQueue;
//# sourceMappingURL=iterable-queue.js.map