@fbltd/async/dist/bin/dependency/dependency.stream.js

Miscellaneous async utils

import { PromiseConfiguration } from "../promise-configuration.js";
import { symAI } from "../constants.js";
export class DependencyStream {
    owner;
    abortPromise = new PromiseConfiguration();
    iterator;
    get isDisposed() {
        return this.iterator.isDisposed;
    }
    get done() {
        return this.owner.done || !this.abortPromise?.isPending;
    }
    constructor(owner) {
        this.owner = owner;
        this.abortPromise = new PromiseConfiguration();
        this.iterator = owner[symAI]();
    }
    [symAI]() {
        const done = { done: true };
        return {
            next: async () => {
                if (this.done) {
                    this.abort();
                    return done;
                }
                const nextRes = this.iterator.next();
                await Promise.race([
                    this.abortPromise.promise,
                    nextRes,
                ]);
                if (this.done) {
                    this.abort();
                    return done;
                }
                this.abortPromise = new PromiseConfiguration();
                return nextRes;
            }
        };
    }
    abort() {
        if (this.abortPromise?.isPending) {
            this.abortPromise.resolve();
            this.abortPromise = undefined;
        }
    }
    dispose() {
        if (this.done)
            return;
        this.abort();
    }
}