@push.rocks/lik/dist_ts/backpressuredarray.js

Provides a collection of lightweight helpers and utilities for Node.js projects.

import * as plugins from './lik.plugins.js';
export class BackpressuredArray {
    constructor(highWaterMark = 16) {
        this.hasSpace = new plugins.smartrx.rxjs.Subject();
        this.itemsAvailable = new plugins.smartrx.rxjs.Subject();
        this.data = [];
        this.highWaterMark = highWaterMark;
    }
    push(item) {
        this.data.push(item);
        this.itemsAvailable.next('itemsAvailable');
        const spaceAvailable = this.checkSpaceAvailable();
        if (spaceAvailable) {
            this.hasSpace.next('hasSpace');
        }
        return spaceAvailable;
    }
    shift() {
        const item = this.data.shift();
        if (this.checkSpaceAvailable()) {
            this.hasSpace.next('hasSpace');
        }
        return item;
    }
    checkSpaceAvailable() {
        return this.data.length < this.highWaterMark;
    }
    waitForSpace() {
        return new Promise((resolve) => {
            if (this.checkSpaceAvailable()) {
                resolve();
            }
            else {
                const subscription = this.hasSpace.subscribe(() => {
                    subscription.unsubscribe();
                    resolve();
                });
            }
        });
    }
    waitForItems() {
        return new Promise((resolve) => {
            if (this.data.length > 0) {
                resolve();
            }
            else {
                const subscription = this.itemsAvailable.subscribe(() => {
                    subscription.unsubscribe();
                    resolve();
                });
            }
        });
    }
}
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