Init

src/workerManager.ts

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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.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+import {LanguageServiceDefaultsImpl} from './monaco.contribution';
+import {CSSWorker} from './worker';
+
+import Promise = monaco.Promise;
+import IDisposable = monaco.IDisposable;
+import Uri = monaco.Uri;
+
+const STOP_WHEN_IDLE_FOR = 2 * 60 * 1000; // 2min
+
+export class WorkerManager {
+
+	private _defaults: LanguageServiceDefaultsImpl;
+	private _idleCheckInterval: number;
+	private _lastUsedTime: number;
+	private _configChangeListener: IDisposable;
+
+	private _worker: monaco.editor.MonacoWebWorker<CSSWorker>;
+	private _client: Promise<CSSWorker>;
+
+	constructor(defaults: LanguageServiceDefaultsImpl) {
+		this._defaults = defaults;
+		this._worker = null;
+		this._idleCheckInterval = setInterval(() => this._checkIfIdle(), 30 * 1000);
+		this._lastUsedTime = 0;
+		this._configChangeListener = this._defaults.onDidChange(() => this._stopWorker());
+	}
+
+	private _stopWorker(): void {
+		if (this._worker) {
+			this._worker.dispose();
+			this._worker = null;
+		}
+		this._client = null;
+	}
+
+	dispose(): void {
+		clearInterval(this._idleCheckInterval);
+		this._configChangeListener.dispose();
+		this._stopWorker();
+	}
+
+	private _checkIfIdle(): void {
+		if (!this._worker) {
+			return;
+		}
+		let timePassedSinceLastUsed = Date.now() - this._lastUsedTime;
+		if (timePassedSinceLastUsed > STOP_WHEN_IDLE_FOR) {
+			this._stopWorker();
+		}
+	}
+
+	private _getClient(): Promise<CSSWorker> {
+		this._lastUsedTime = Date.now();
+
+		if (!this._client) {
+			this._worker = monaco.editor.createWebWorker<CSSWorker>({
+
+				// module that exports the create() method and returns a `CSSWorker` instance
+				moduleId: 'vs/language/css/src/worker',
+
+				// passed in to the create() method
+				createData: {
+					languageSettings: this._defaults.diagnosticsOptions
+				}
+			});
+
+			this._client = this._worker.getProxy();
+		}
+
+		return this._client;
+	}
+
+	getLanguageServiceWorker(...resources: Uri[]): Promise<CSSWorker> {
+		let _client:CSSWorker;
+		return toShallowCancelPromise(
+			this._getClient().then((client) => {
+				_client = client
+			}).then(_ => {
+				return this._worker.withSyncedResources(resources)
+			}).then(_ => _client)
+		);
+	}
+}
+
+function toShallowCancelPromise<T>(p:Promise<T>): Promise<T> {
+	let completeCallback: (value:T)=>void;
+	let errorCallback: (err:any)=>void;
+
+	let r = new Promise<T>((c, e) => {
+		completeCallback = c;
+		errorCallback = e;
+	}, () => { });
+
+	p.then(completeCallback, errorCallback);
+
+	return r;
+}