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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { getErrorMessage } from 'vs/base/common/errors';
import { Emitter } from 'vs/base/common/event';
import { Disposable, toDisposable } from 'vs/base/common/lifecycle';
export class BroadcastDataChannel<T> extends Disposable {
private broadcastChannel: BroadcastChannel | undefined;
private readonly _onDidReceiveData = this._register(new Emitter<T>());
readonly onDidReceiveData = this._onDidReceiveData.event;
constructor(private readonly channelName: string) {
super();
// Use BroadcastChannel
if ('BroadcastChannel' in window) {
try {
this.broadcastChannel = new BroadcastChannel(channelName);
const listener = (event: MessageEvent) => {
this._onDidReceiveData.fire(event.data);
};
this.broadcastChannel.addEventListener('message', listener);
this._register(toDisposable(() => {
if (this.broadcastChannel) {
this.broadcastChannel.removeEventListener('message', listener);
this.broadcastChannel.close();
}
}));
} catch (error) {
console.warn('Error while creating broadcast channel. Falling back to localStorage.', getErrorMessage(error));
}
}
// BroadcastChannel is not supported. Use storage.
if (!this.broadcastChannel) {
this.channelName = `BroadcastDataChannel.${channelName}`;
this.createBroadcastChannel();
}
}
private createBroadcastChannel(): void {
const listener = (event: StorageEvent) => {
if (event.key === this.channelName && event.newValue) {
this._onDidReceiveData.fire(JSON.parse(event.newValue));
}
};
window.addEventListener('storage', listener);
this._register(toDisposable(() => window.removeEventListener('storage', listener)));
}
/**
* Sends the data to other BroadcastChannel objects set up for this channel. Data can be structured objects, e.g. nested objects and arrays.
* @param data data to broadcast
*/
postData(data: T): void {
if (this.broadcastChannel) {
this.broadcastChannel.postMessage(data);
} else {
// remove previous changes so that event is triggered even if new changes are same as old changes
window.localStorage.removeItem(this.channelName);
window.localStorage.setItem(this.channelName, JSON.stringify(data));
}
}
}
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