Merge from vscode 31e03b8ffbb218a87e3941f2b63a249f061fe0e4 (#4986)

src/vs/workbench/api/common/extHostHeapService.ts

@@ -0,0 +1,33 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { ExtHostHeapServiceShape } from './extHost.protocol';
+
+export class ExtHostHeapService implements ExtHostHeapServiceShape {
+
+	private static _idPool = 0;
+
+	private _data = new Map<number, any>();
+
+	keep(obj: any): number {
+		const id = ExtHostHeapService._idPool++;
+		this._data.set(id, obj);
+		return id;
+	}
+
+	delete(id: number): boolean {
+		return this._data.delete(id);
+	}
+
+	get<T>(id: number): T {
+		return this._data.get(id);
+	}
+
+	$onGarbageCollection(ids: number[]): void {
+		for (const id of ids) {
+			this.delete(id);
+		}
+	}
+}