Merge from vscode 8df646d3c5477b02737fc10343fa7cf0cc3f606b

src/vs/platform/userDataSync/common/storageKeys.ts

@@ -0,0 +1,63 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { Event, Emitter } from 'vs/base/common/event';
+import { values } from 'vs/base/common/map';
+import { Disposable, toDisposable } from 'vs/base/common/lifecycle';
+import { createDecorator } from 'vs/platform/instantiation/common/instantiation';
+
+export interface IStorageKey {
+
+	readonly key: string;
+	readonly version: number;
+
+}
+
+export const IStorageKeysSyncRegistryService = createDecorator<IStorageKeysSyncRegistryService>('IStorageKeysSyncRegistryService');
+
+export interface IStorageKeysSyncRegistryService {
+
+	_serviceBrand: any;
+
+	/**
+	 * All registered storage keys
+	 */
+	readonly storageKeys: ReadonlyArray<IStorageKey>;
+
+	/**
+	 * Event that is triggered when storage keys are changed
+	 */
+	readonly onDidChangeStorageKeys: Event<ReadonlyArray<IStorageKey>>;
+
+	/**
+	 * Register a storage key that has to be synchronized during sync.
+	 */
+	registerStorageKey(key: IStorageKey): void;
+
+}
+
+export class StorageKeysSyncRegistryService extends Disposable implements IStorageKeysSyncRegistryService {
+
+	_serviceBrand: any;
+
+	private readonly _storageKeys = new Map<string, IStorageKey>();
+	get storageKeys(): ReadonlyArray<IStorageKey> { return values(this._storageKeys); }
+
+	private readonly _onDidChangeStorageKeys: Emitter<ReadonlyArray<IStorageKey>> = this._register(new Emitter<ReadonlyArray<IStorageKey>>());
+	readonly onDidChangeStorageKeys = this._onDidChangeStorageKeys.event;
+
+	constructor() {
+		super();
+		this._register(toDisposable(() => this._storageKeys.clear()));
+	}
+
+	registerStorageKey(storageKey: IStorageKey): void {
+		if (!this._storageKeys.has(storageKey.key)) {
+			this._storageKeys.set(storageKey.key, storageKey);
+			this._onDidChangeStorageKeys.fire(this.storageKeys);
+		}
+	}
+
+}