rc-js-util/bin/esm/eventing/broadcast-channel.js

A collection of TS and C++ utilities to help writing performant and correct applications, achieved through strict typing and (removable) invariant checking.

import { DirtyCheckedUniqueCollection } from "../collection/dirty-checked-unique-collection.js";
/**
 * @public
 * Strong reference implementation of {@link IBroadcastChannel}.
 */
export class BroadcastChannel {
    constructor(key) {
        this.key = key;
        this.listeners = new DirtyCheckedUniqueCollection();
    }
    addListener(maybeStore, listener) {
        if (listener == null) {
            // no store was supplied
            listener = maybeStore;
        }
        else {
            // we have both args
            maybeStore.registerCleanup(() => this.removeListener(listener));
        }
        this.listeners.add(listener);
    }
    addOneTimeListener(maybeStore, listener) {
        const hasStore = listener != null;
        if (listener == null) {
            // no store was supplied
            listener = maybeStore;
        }
        const temporaryListener = {
            [this.key]: (...args) => {
                this.removeListener(temporaryListener);
                return listener[this.key](...args);
            }
        };
        this.addListener(temporaryListener);
        if (hasStore) {
            maybeStore.registerCleanup(() => this.removeListener(temporaryListener));
        }
    }
    removeListener(listener) {
        this.listeners.delete(listener);
    }
    emit(...args) {
        const listeners = this.listeners.getArray();
        const key = this.key;
        for (let i = 0, iEnd = listeners.length; i < iEnd; i++) {
            listeners[i][key](...args);
        }
    }
    getTargets() {
        return this.listeners.getArray();
    }
}
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