timing-provider/build/es2019/operators/demultiplex-messages.js

An implementation of the timing provider specification.

import { Observable, Subject, skip, take } from 'rxjs';
import { ultimately } from './ultimately';
export const demultiplexMessages = (getClientId, timer) => (source) => new Observable((observer) => {
    const subjects = new Map();
    const completeAll = () => {
        subjects.forEach(([subject, subscription]) => {
            if (subject === null) {
                subscription.unsubscribe();
            }
            else {
                subject.complete();
            }
        });
    };
    const isActive = (remoteClientId) => getClientId() < remoteClientId;
    return source.pipe(ultimately(() => completeAll())).subscribe({
        complete() {
            observer.complete();
        },
        error(err) {
            observer.error(err);
        },
        next(event) {
            var _a;
            const remoteClientId = event.client.id;
            const [subject, subscription] = (_a = subjects.get(remoteClientId)) !== null && _a !== void 0 ? _a : [null, null];
            if (event.type === 'termination') {
                if (subscription !== null) {
                    subscription.unsubscribe();
                }
                if (subject !== null) {
                    subject.complete();
                }
                subjects.set(remoteClientId, [
                    null,
                    timer.pipe(skip(isActive(remoteClientId) ? 1 : 0), take(1)).subscribe(() => subjects.delete(remoteClientId)) // tslint:disable-line:rxjs-no-nested-subscribe
                ]);
            }
            else if (subject === null && subscription === null) {
                const newSubject = new Subject();
                subjects.set(remoteClientId, [newSubject, null]);
                observer.next([remoteClientId, isActive(remoteClientId), newSubject.asObservable()]);
                newSubject.next(event);
            }
            else if (subscription === null) {
                subject.next(event);
            }
        }
    });
});
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