41 lines
1.1 KiB
Plaintext
41 lines
1.1 KiB
Plaintext
import { Subscriber } from './types';
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export type Subscribers = {
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[url: string]: Set<Subscriber>,
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}
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const subscribers: Subscribers = {};
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const EMPTY_LIST: Subscriber[] = [];
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export const getSubscribers = (url: string): Subscriber[] => {
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if (hasSubscribers(url)) {
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return Array.from(subscribers[url]);
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}
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return EMPTY_LIST;
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};
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export const hasSubscribers = (url: string): boolean => {
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return subscribers[url]?.size > 0;
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};
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export const addSubscriber = (url: string, subscriber: Subscriber): void => {
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subscribers[url] = subscribers[url] || new Set<Subscriber>();
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subscribers[url].add(subscriber);
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};
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export const removeSubscriber = (url: string, subscriber: Subscriber): void => {
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subscribers[url].delete(subscriber);
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};
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export const resetSubscribers = (url?: string): void => {
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if (url && subscribers.hasOwnProperty(url)) {
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delete subscribers[url];
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} else {
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for (let url in subscribers){
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if (subscribers.hasOwnProperty(url)){
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delete subscribers[url];
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}
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}
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}
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}
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