Move SQL 2019 extension's notebook code into Azure Data Studio (#4090)

extensions/notebook/src/common/appContext.ts

@@ -0,0 +1,28 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+import * as vscode from 'vscode';
+import { ApiWrapper } from './apiWrapper';
+
+/**
+ * Global context for the application
+ */
+export class AppContext {
+
+	private serviceMap: Map<string, any> = new Map();
+	constructor(public readonly extensionContext: vscode.ExtensionContext, public readonly apiWrapper: ApiWrapper) {
+		this.apiWrapper = apiWrapper || new ApiWrapper();
+	}
+
+	public getService<T>(serviceName: string): T {
+		return this.serviceMap.get(serviceName) as T;
+	}
+
+	public registerService<T>(serviceName: string, service: T): void {
+		this.serviceMap.set(serviceName, service);
+	}
+}