@push.rocks/lik
Version:
Provides a collection of lightweight helpers and utilities for Node.js projects.
58 lines • 4.04 kB
JavaScript
import * as plugins from './classes.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;
}
checkHasItems() {
return this.data.length > 0;
}
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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