rxpoweredup/src/messenger/outbound-messenger/queue-tasks/task-with-response.js

A Typescript RxJS-based library for controlling LEGO Powered UP hubs & peripherals.

import { BehaviorSubject, EMPTY, Subject, filter, from, of, switchMap, take } from 'rxjs';
export class TaskWithResponse {
    message;
    responsesStream;
    result;
    completed = new BehaviorSubject(false);
    earlyResponseCaptureSubscription;
    constructor(message, responsesStream) {
        this.message = message;
        this.responsesStream = responsesStream;
        this.result = new Subject();
    }
    discard() {
        this.result.complete();
    }
    accept(visitor) {
        visitor.visitTaskWithResponse(this);
    }
    dispose() {
        this.earlyResponseCaptureSubscription?.unsubscribe();
    }
    emitError(error) {
        this.result.error(error);
        this.earlyResponseCaptureSubscription?.unsubscribe();
        this.completed.complete();
    }
    execute(channel) {
        this.earlyResponseCaptureSubscription?.unsubscribe();
        this.earlyResponseCaptureSubscription = this.responsesStream
            .pipe(take(1))
            .subscribe({
            next: (response) => {
                this.result.next(response);
                this.result.complete();
                this.completed.next(true);
            },
            error: (error) => {
                this.result.error(error);
                this.result.complete();
                this.completed.next(true);
            },
            complete: () => {
                this.result.complete();
                this.completed.next(true);
            },
        });
        if (this.completed.value) {
            return EMPTY;
        }
        else {
            return of(null).pipe(switchMap(() => from(channel.sendMessage(this.message))), switchMap(() => this.completed), filter((v) => v), take(1));
        }
    }
}