Move `deltaExtensions` related methods up to `AbstractExtensionService`

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

@@ -506,7 +506,7 @@ export abstract class AbstractExtHostExtensionService extends Disposable impleme
 		const host: IExtensionActivationHost = {
 			folders: folders.map(folder => folder.uri),
 			forceUsingSearch: localWithRemote,
-			exists: (path) => this._hostUtils.exists(path),
+			exists: (uri) => this._hostUtils.exists(uri.fsPath),
 			checkExists: (folders, includes, token) => this._mainThreadWorkspaceProxy.$checkExists(folders, includes, token)
 		};
 

src/vs/workbench/api/common/shared/workspaceContains.ts

@@ -3,7 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import * as path from 'vs/base/common/path';
+import * as resources from 'vs/base/common/resources';
 import { URI, UriComponents } from 'vs/base/common/uri';
 import { CancellationTokenSource, CancellationToken } from 'vs/base/common/cancellation';
 import * as errors from 'vs/base/common/errors';
@@ -19,7 +19,7 @@ export interface IExtensionActivationHost {
 	readonly folders: readonly UriComponents[];
 	readonly forceUsingSearch: boolean;
 
-	exists(path: string): Promise<boolean>;
+	exists(uri: URI): Promise<boolean>;
 	checkExists(folders: readonly UriComponents[], includes: string[], token: CancellationToken): Promise<boolean>;
 }
 
@@ -69,7 +69,7 @@ export function checkActivateWorkspaceContainsExtension(host: IExtensionActivati
 async function _activateIfFileName(host: IExtensionActivationHost, fileName: string, activate: (activationEvent: string) => void): Promise<void> {
 	// find exact path
 	for (const uri of host.folders) {
-		if (await host.exists(path.join(URI.revive(uri).fsPath, fileName))) {
+		if (await host.exists(resources.joinPath(URI.revive(uri), fileName))) {
 			// the file was found
 			activate(`workspaceContains:${fileName}`);
 			return;

src/vs/workbench/services/extensions/browser/extensionService.ts

@@ -19,13 +19,15 @@ import { INotificationService, Severity } from 'vs/platform/notification/common/
 import { WebWorkerExtensionHost } from 'vs/workbench/services/extensions/browser/webWorkerExtensionHost';
 import { getExtensionKind } from 'vs/workbench/services/extensions/common/extensionsUtil';
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
-import { ExtensionIdentifier, IExtensionDescription, ExtensionKind } from 'vs/platform/extensions/common/extensions';
+import { ExtensionIdentifier, IExtensionDescription, ExtensionKind, IExtension } from 'vs/platform/extensions/common/extensions';
 import { FetchFileSystemProvider } from 'vs/workbench/services/extensions/browser/webWorkerFileSystemProvider';
 import { Schemas } from 'vs/base/common/network';
 import { DisposableStore } from 'vs/base/common/lifecycle';
 import { IRemoteAuthorityResolverService } from 'vs/platform/remote/common/remoteAuthorityResolver';
 import { ILifecycleService, LifecyclePhase } from 'vs/platform/lifecycle/common/lifecycle';
 import { IUserDataInitializationService } from 'vs/workbench/services/userData/browser/userDataInit';
+import { IExtensionManagementService } from 'vs/platform/extensionManagement/common/extensionManagement';
+import { IWorkspaceContextService } from 'vs/platform/workspace/common/workspace';
 
 export class ExtensionService extends AbstractExtensionService implements IExtensionService {
 
@@ -41,6 +43,8 @@ export class ExtensionService extends AbstractExtensionService implements IExten
 		@IWorkbenchExtensionEnablementService extensionEnablementService: IWorkbenchExtensionEnablementService,
 		@IFileService fileService: IFileService,
 		@IProductService productService: IProductService,
+		@IExtensionManagementService extensionManagementService: IExtensionManagementService,
+		@IWorkspaceContextService contextService: IWorkspaceContextService,
 		@IRemoteAuthorityResolverService private readonly _remoteAuthorityResolverService: IRemoteAuthorityResolverService,
 		@IRemoteAgentService private readonly _remoteAgentService: IRemoteAgentService,
 		@IConfigurationService private readonly _configService: IConfigurationService,
@@ -56,6 +60,8 @@ export class ExtensionService extends AbstractExtensionService implements IExten
 			extensionEnablementService,
 			fileService,
 			productService,
+			extensionManagementService,
+			contextService,
 		);
 
 		this._runningLocation = new Map<string, ExtensionRunningLocation>();
@@ -74,6 +80,13 @@ export class ExtensionService extends AbstractExtensionService implements IExten
 		super.dispose();
 	}
 
+	protected async _scanSingleExtension(extension: IExtension): Promise<IExtensionDescription | null> {
+		return null;
+	}
+
+	protected async _updateExtensionsOnExtHosts(toAdd: IExtensionDescription[], toRemove: ExtensionIdentifier[]): Promise<void> {
+	}
+
 	private _initFetchFileSystem(): void {
 		const provider = new FetchFileSystemProvider();
 		this._disposables.add(this._fileService.registerProvider(Schemas.http, provider));

src/vs/workbench/services/extensions/common/abstractExtensionService.ts

@@ -3,6 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
+import * as nls from 'vs/nls';
 import { isNonEmptyArray } from 'vs/base/common/arrays';
 import { Barrier } from 'vs/base/common/async';
 import { Emitter, Event } from 'vs/base/common/event';
@@ -20,11 +21,14 @@ import { ExtensionMessageCollector, ExtensionPoint, ExtensionsRegistry, IExtensi
 import { ExtensionDescriptionRegistry } from 'vs/workbench/services/extensions/common/extensionDescriptionRegistry';
 import { ResponsiveState } from 'vs/workbench/services/extensions/common/rpcProtocol';
 import { ExtensionHostManager } from 'vs/workbench/services/extensions/common/extensionHostManager';
-import { ExtensionIdentifier, IExtensionDescription, ExtensionType, ITranslatedScannedExtension } from 'vs/platform/extensions/common/extensions';
+import { ExtensionIdentifier, IExtensionDescription, ExtensionType, ITranslatedScannedExtension, IExtension } from 'vs/platform/extensions/common/extensions';
 import { IFileService } from 'vs/platform/files/common/files';
 import { parseExtensionDevOptions } from 'vs/workbench/services/extensions/common/extensionDevOptions';
 import { IProductService } from 'vs/platform/product/common/productService';
 import { ExtensionActivationReason } from 'vs/workbench/api/common/extHostExtensionActivator';
+import { IExtensionManagementService } from 'vs/platform/extensionManagement/common/extensionManagement';
+import { IExtensionActivationHost as IWorkspaceContainsActivationHost, checkGlobFileExists, checkActivateWorkspaceContainsExtension } from 'vs/workbench/api/common/shared/workspaceContains';
+import { IWorkspaceContextService } from 'vs/platform/workspace/common/workspace';
 
 const hasOwnProperty = Object.hasOwnProperty;
 const NO_OP_VOID_PROMISE = Promise.resolve<void>(undefined);
@@ -39,6 +43,13 @@ export function parseScannedExtension(extension: ITranslatedScannedExtension): I
 	};
 }
 
+class DeltaExtensionsQueueItem {
+	constructor(
+		public readonly toAdd: IExtension[],
+		public readonly toRemove: string[]
+	) { }
+}
+
 export abstract class AbstractExtensionService extends Disposable implements IExtensionService {
 
 	public _serviceBrand: undefined;
@@ -66,6 +77,8 @@ export abstract class AbstractExtensionService extends Disposable implements IEx
 	private readonly _proposedApiController: ProposedApiController;
 	private readonly _isExtensionDevHost: boolean;
 	protected readonly _isExtensionDevTestFromCli: boolean;
+	private _deltaExtensionsQueue: DeltaExtensionsQueueItem[];
+	private _inHandleDeltaExtensions: boolean;
 
 	// --- Members used per extension host process
 	protected _extensionHostManagers: ExtensionHostManager[];
@@ -80,7 +93,9 @@ export abstract class AbstractExtensionService extends Disposable implements IEx
 		@ITelemetryService protected readonly _telemetryService: ITelemetryService,
 		@IWorkbenchExtensionEnablementService protected readonly _extensionEnablementService: IWorkbenchExtensionEnablementService,
 		@IFileService protected readonly _fileService: IFileService,
-		@IProductService protected readonly _productService: IProductService
+		@IProductService protected readonly _productService: IProductService,
+		@IExtensionManagementService protected readonly _extensionManagementService: IExtensionManagementService,
+		@IWorkspaceContextService private readonly _contextService: IWorkspaceContextService,
 	) {
 		super();
 
@@ -103,8 +118,225 @@ export abstract class AbstractExtensionService extends Disposable implements IEx
 		const devOpts = parseExtensionDevOptions(this._environmentService);
 		this._isExtensionDevHost = devOpts.isExtensionDevHost;
 		this._isExtensionDevTestFromCli = devOpts.isExtensionDevTestFromCli;
+
+		this._deltaExtensionsQueue = [];
+		this._inHandleDeltaExtensions = false;
+
+		this._register(this._extensionEnablementService.onEnablementChanged((extensions) => {
+			let toAdd: IExtension[] = [];
+			let toRemove: string[] = [];
+			for (const extension of extensions) {
+				if (this._extensionEnablementService.isEnabled(extension)) {
+					// an extension has been enabled
+					toAdd.push(extension);
+				} else {
+					// an extension has been disabled
+					toRemove.push(extension.identifier.id);
+				}
+			}
+			this._handleDeltaExtensions(new DeltaExtensionsQueueItem(toAdd, toRemove));
+		}));
+
+		this._register(this._extensionManagementService.onDidInstallExtension((event) => {
+			if (event.local) {
+				if (this._extensionEnablementService.isEnabled(event.local)) {
+					// an extension has been installed
+					this._handleDeltaExtensions(new DeltaExtensionsQueueItem([event.local], []));
+				}
+			}
+		}));
+
+		this._register(this._extensionManagementService.onDidUninstallExtension((event) => {
+			if (!event.error) {
+				// an extension has been uninstalled
+				this._handleDeltaExtensions(new DeltaExtensionsQueueItem([], [event.identifier.id]));
+			}
+		}));
+	}
+
+	//#region deltaExtensions
+
+	private async _handleDeltaExtensions(item: DeltaExtensionsQueueItem): Promise<void> {
+		this._deltaExtensionsQueue.push(item);
+		if (this._inHandleDeltaExtensions) {
+			// Let the current item finish, the new one will be picked up
+			return;
+		}
+
+		while (this._deltaExtensionsQueue.length > 0) {
+			const item = this._deltaExtensionsQueue.shift()!;
+			try {
+				this._inHandleDeltaExtensions = true;
+				await this._deltaExtensions(item.toAdd, item.toRemove);
+			} finally {
+				this._inHandleDeltaExtensions = false;
+			}
+		}
+	}
+
+	private async _deltaExtensions(_toAdd: IExtension[], _toRemove: string[]): Promise<void> {
+		if (this._environmentService.configuration.remoteAuthority) {
+			return;
+		}
+
+		let toAdd: IExtensionDescription[] = [];
+		for (let i = 0, len = _toAdd.length; i < len; i++) {
+			const extension = _toAdd[i];
+
+			if (!this._canAddExtension(extension)) {
+				continue;
+			}
+
+			const extensionDescription = await this._scanSingleExtension(extension);
+			if (!extensionDescription) {
+				// could not scan extension...
+				continue;
+			}
+
+			toAdd.push(extensionDescription);
+		}
+
+		let toRemove: IExtensionDescription[] = [];
+		for (let i = 0, len = _toRemove.length; i < len; i++) {
+			const extensionId = _toRemove[i];
+			const extensionDescription = this._registry.getExtensionDescription(extensionId);
+			if (!extensionDescription) {
+				// ignore disabling/uninstalling an extension which is not running
+				continue;
+			}
+
+			if (!this.canRemoveExtension(extensionDescription)) {
+				// uses non-dynamic extension point or is activated
+				continue;
+			}
+
+			toRemove.push(extensionDescription);
+		}
+
+		if (toAdd.length === 0 && toRemove.length === 0) {
+			return;
+		}
+
+		// Update the local registry
+		const result = this._registry.deltaExtensions(toAdd, toRemove.map(e => e.identifier));
+		this._onDidChangeExtensions.fire(undefined);
+
+		toRemove = toRemove.concat(result.removedDueToLooping);
+		if (result.removedDueToLooping.length > 0) {
+			this._logOrShowMessage(Severity.Error, nls.localize('looping', "The following extensions contain dependency loops and have been disabled: {0}", result.removedDueToLooping.map(e => `'${e.identifier.value}'`).join(', ')));
+		}
+
+		// enable or disable proposed API per extension
+		this._checkEnableProposedApi(toAdd);
+
+		// Update extension points
+		this._doHandleExtensionPoints((<IExtensionDescription[]>[]).concat(toAdd).concat(toRemove));
+
+		// Update the extension host
+		this._updateExtensionsOnExtHosts(toAdd, toRemove.map(e => e.identifier));
+
+		for (let i = 0; i < toAdd.length; i++) {
+			this._activateAddedExtensionIfNeeded(toAdd[i]);
+		}
+	}
+
+	public canAddExtension(extensionDescription: IExtensionDescription): boolean {
+		return this._canAddExtension(toExtension(extensionDescription));
+	}
+
+	protected _canAddExtension(extension: IExtension): boolean {
+		const extensionDescription = this._registry.getExtensionDescription(extension.identifier.id);
+		if (extensionDescription) {
+			// this extension is already running (most likely at a different version)
+			return false;
+		}
+
+		// Check if extension is renamed
+		if (extension.identifier.uuid && this._registry.getAllExtensionDescriptions().some(e => e.uuid === extension.identifier.uuid)) {
+			return false;
+		}
+
+		return true;
+	}
+
+	public canRemoveExtension(extension: IExtensionDescription): boolean {
+		const extensionDescription = this._registry.getExtensionDescription(extension.identifier);
+		if (!extensionDescription) {
+			// ignore removing an extension which is not running
+			return false;
+		}
+
+		if (this._extensionHostActiveExtensions.has(ExtensionIdentifier.toKey(extensionDescription.identifier))) {
+			// Extension is running, cannot remove it safely
+			return false;
+		}
+
+		return true;
+	}
+
+	private async _activateAddedExtensionIfNeeded(extensionDescription: IExtensionDescription): Promise<void> {
+		let shouldActivate = false;
+		let shouldActivateReason: string | null = null;
+		let hasWorkspaceContains = false;
+		if (Array.isArray(extensionDescription.activationEvents)) {
+			for (let activationEvent of extensionDescription.activationEvents) {
+				// TODO@joao: there's no easy way to contribute this
+				if (activationEvent === 'onUri') {
+					activationEvent = `onUri:${ExtensionIdentifier.toKey(extensionDescription.identifier)}`;
+				}
+
+				if (this._allRequestedActivateEvents.has(activationEvent)) {
+					// This activation event was fired before the extension was added
+					shouldActivate = true;
+					shouldActivateReason = activationEvent;
+					break;
+				}
+
+				if (activationEvent === '*') {
+					shouldActivate = true;
+					shouldActivateReason = activationEvent;
+					break;
+				}
+
+				if (/^workspaceContains/.test(activationEvent)) {
+					hasWorkspaceContains = true;
+				}
+
+				if (activationEvent === 'onStartupFinished') {
+					shouldActivate = true;
+					shouldActivateReason = activationEvent;
+					break;
+				}
+			}
+		}
+
+		if (shouldActivate) {
+			await Promise.all(
+				this._extensionHostManagers.map(extHostManager => extHostManager.activate(extensionDescription.identifier, { startup: false, extensionId: extensionDescription.identifier, activationEvent: shouldActivateReason! }))
+			).then(() => { });
+		} else if (hasWorkspaceContains) {
+			const workspace = await this._contextService.getCompleteWorkspace();
+			const forceUsingSearch = !!this._environmentService.configuration.remoteAuthority;
+			const host: IWorkspaceContainsActivationHost = {
+				folders: workspace.folders.map(folder => folder.uri),
+				forceUsingSearch: forceUsingSearch,
+				exists: (uri) => this._fileService.exists(uri),
+				checkExists: (folders, includes, token) => this._instantiationService.invokeFunction((accessor) => checkGlobFileExists(accessor, folders, includes, token))
+			};
+
+			const result = await checkActivateWorkspaceContainsExtension(host, extensionDescription);
+			if (!result) {
+				return;
+			}
+
+			await Promise.all(
+				this._extensionHostManagers.map(extHostManager => extHostManager.activate(extensionDescription.identifier, { startup: false, extensionId: extensionDescription.identifier, activationEvent: result.activationEvent }))
+			).then(() => { });
+		}
 	}
 
+	//#endregion
+
 	protected async _initialize(): Promise<void> {
 		perf.mark('willLoadExtensions');
 		this._startExtensionHosts(true, []);
@@ -169,14 +401,6 @@ export abstract class AbstractExtensionService extends Disposable implements IEx
 
 	//#region IExtensionService
 
-	public canAddExtension(extension: IExtensionDescription): boolean {
-		return false;
-	}
-
-	public canRemoveExtension(extension: IExtensionDescription): boolean {
-		return false;
-	}
-
 	public restartExtensionHost(): void {
 		this._stopExtensionHosts();
 		this._startExtensionHosts(false, Array.from(this._allRequestedActivateEvents.keys()));
@@ -463,6 +687,8 @@ export abstract class AbstractExtensionService extends Disposable implements IEx
 
 	protected abstract _createExtensionHosts(isInitialStart: boolean): IExtensionHost[];
 	protected abstract _scanAndHandleExtensions(): Promise<void>;
+	protected abstract _scanSingleExtension(extension: IExtension): Promise<IExtensionDescription | null>;
+	protected abstract _updateExtensionsOnExtHosts(toAdd: IExtensionDescription[], toRemove: ExtensionIdentifier[]): Promise<void>;
 	public abstract _onExtensionHostExit(code: number): void;
 }
 

src/vs/workbench/services/extensions/electron-browser/extensionService.ts

@@ -25,7 +25,6 @@ import { IHostService } from 'vs/workbench/services/host/browser/host';
 import { IExtensionService, toExtension, ExtensionHostKind, IExtensionHost, webWorkerExtHostConfig } from 'vs/workbench/services/extensions/common/extensions';
 import { ExtensionHostManager } from 'vs/workbench/services/extensions/common/extensionHostManager';
 import { ExtensionIdentifier, IExtension, ExtensionType, IExtensionDescription, ExtensionKind } from 'vs/platform/extensions/common/extensions';
-import { Schemas } from 'vs/base/common/network';
 import { IFileService } from 'vs/platform/files/common/files';
 import { PersistentConnectionEventType } from 'vs/platform/remote/common/remoteAgentConnection';
 import { IProductService } from 'vs/platform/product/common/productService';
@@ -37,18 +36,10 @@ import { Action2, registerAction2 } from 'vs/platform/actions/common/actions';
 import { getRemoteName } from 'vs/platform/remote/common/remoteHosts';
 import { IRemoteAgentEnvironment } from 'vs/platform/remote/common/remoteAgentEnvironment';
 import { WebWorkerExtensionHost } from 'vs/workbench/services/extensions/browser/webWorkerExtensionHost';
-import { IExtensionActivationHost as IWorkspaceContainsActivationHost, checkGlobFileExists, checkActivateWorkspaceContainsExtension } from 'vs/workbench/api/common/shared/workspaceContains';
 import { IWorkspaceContextService } from 'vs/platform/workspace/common/workspace';
-import { exists } from 'vs/base/node/pfs';
 import { ILogService } from 'vs/platform/log/common/log';
 import { CATEGORIES } from 'vs/workbench/common/actions';
-
-class DeltaExtensionsQueueItem {
-	constructor(
-		public readonly toAdd: IExtension[],
-		public readonly toRemove: string[]
-	) { }
-}
+import { Schemas } from 'vs/base/common/network';
 
 export class ExtensionService extends AbstractExtensionService implements IExtensionService {
 
@@ -56,7 +47,6 @@ export class ExtensionService extends AbstractExtensionService implements IExten
 	private readonly _remoteInitData: Map<string, IRemoteExtensionHostInitData>;
 	private _runningLocation: Map<string, ExtensionRunningLocation>;
 	private readonly _extensionScanner: CachedExtensionScanner;
-	private _deltaExtensionsQueue: DeltaExtensionsQueueItem[];
 
 	constructor(
 		@IInstantiationService instantiationService: IInstantiationService,
@@ -66,7 +56,8 @@ export class ExtensionService extends AbstractExtensionService implements IExten
 		@IWorkbenchExtensionEnablementService extensionEnablementService: IWorkbenchExtensionEnablementService,
 		@IFileService fileService: IFileService,
 		@IProductService productService: IProductService,
-		@IExtensionManagementService private readonly _extensionManagementService: IExtensionManagementService,
+		@IExtensionManagementService extensionManagementService: IExtensionManagementService,
+		@IWorkspaceContextService contextService: IWorkspaceContextService,
 		@IRemoteAgentService private readonly _remoteAgentService: IRemoteAgentService,
 		@IRemoteAuthorityResolverService private readonly _remoteAuthorityResolverService: IRemoteAuthorityResolverService,
 		@IConfigurationService private readonly _configurationService: IConfigurationService,
@@ -76,7 +67,6 @@ export class ExtensionService extends AbstractExtensionService implements IExten
 		@IHostService private readonly _hostService: IHostService,
 		@IRemoteExplorerService private readonly _remoteExplorerService: IRemoteExplorerService,
 		@IExtensionGalleryService private readonly _extensionGalleryService: IExtensionGalleryService,
-		@IWorkspaceContextService private readonly _contextService: IWorkspaceContextService,
 		@ILogService private readonly _logService: ILogService,
 	) {
 		super(
@@ -86,7 +76,9 @@ export class ExtensionService extends AbstractExtensionService implements IExten
 			telemetryService,
 			extensionEnablementService,
 			fileService,
-			productService
+			productService,
+			extensionManagementService,
+			contextService,
 		);
 
 		this._enableLocalWebWorker = this._configurationService.getValue<boolean>(webWorkerExtHostConfig);
@@ -95,38 +87,6 @@ export class ExtensionService extends AbstractExtensionService implements IExten
 		this._runningLocation = new Map<string, ExtensionRunningLocation>();
 
 		this._extensionScanner = instantiationService.createInstance(CachedExtensionScanner);
-		this._deltaExtensionsQueue = [];
-
-		this._register(this._extensionEnablementService.onEnablementChanged((extensions) => {
-			let toAdd: IExtension[] = [];
-			let toRemove: string[] = [];
-			for (const extension of extensions) {
-				if (this._extensionEnablementService.isEnabled(extension)) {
-					// an extension has been enabled
-					toAdd.push(extension);
-				} else {
-					// an extension has been disabled
-					toRemove.push(extension.identifier.id);
-				}
-			}
-			this._handleDeltaExtensions(new DeltaExtensionsQueueItem(toAdd, toRemove));
-		}));
-
-		this._register(this._extensionManagementService.onDidInstallExtension((event) => {
-			if (event.local) {
-				if (this._extensionEnablementService.isEnabled(event.local)) {
-					// an extension has been installed
-					this._handleDeltaExtensions(new DeltaExtensionsQueueItem([event.local], []));
-				}
-			}
-		}));
-
-		this._register(this._extensionManagementService.onDidUninstallExtension((event) => {
-			if (!event.error) {
-				// an extension has been uninstalled
-				this._handleDeltaExtensions(new DeltaExtensionsQueueItem([], [event.identifier.id]));
-			}
-		}));
 
 		// delay extension host creation and extension scanning
 		// until the workbench is running. we cannot defer the
@@ -163,101 +123,7 @@ export class ExtensionService extends AbstractExtensionService implements IExten
 		return null;
 	}
 
-	//#region deltaExtensions
-
-	private _inHandleDeltaExtensions = false;
-	private async _handleDeltaExtensions(item: DeltaExtensionsQueueItem): Promise<void> {
-		this._deltaExtensionsQueue.push(item);
-		if (this._inHandleDeltaExtensions) {
-			// Let the current item finish, the new one will be picked up
-			return;
-		}
-
-		while (this._deltaExtensionsQueue.length > 0) {
-			const item = this._deltaExtensionsQueue.shift()!;
-			try {
-				this._inHandleDeltaExtensions = true;
-				await this._deltaExtensions(item.toAdd, item.toRemove);
-			} finally {
-				this._inHandleDeltaExtensions = false;
-			}
-		}
-	}
-
-	private async _deltaExtensions(_toAdd: IExtension[], _toRemove: string[]): Promise<void> {
-		if (this._environmentService.configuration.remoteAuthority) {
-			return;
-		}
-
-		let toAdd: IExtensionDescription[] = [];
-		for (let i = 0, len = _toAdd.length; i < len; i++) {
-			const extension = _toAdd[i];
-
-			if (!this._canAddExtension(extension)) {
-				continue;
-			}
-
-			const extensionDescription = await this._extensionScanner.scanSingleExtension(extension.location.fsPath, extension.type === ExtensionType.System, this.createLogger());
-			if (!extensionDescription) {
-				// could not scan extension...
-				continue;
-			}
-
-			toAdd.push(extensionDescription);
-		}
-
-		let toRemove: IExtensionDescription[] = [];
-		for (let i = 0, len = _toRemove.length; i < len; i++) {
-			const extensionId = _toRemove[i];
-			const extensionDescription = this._registry.getExtensionDescription(extensionId);
-			if (!extensionDescription) {
-				// ignore disabling/uninstalling an extension which is not running
-				continue;
-			}
-
-			if (!this._canRemoveExtension(extensionDescription)) {
-				// uses non-dynamic extension point or is activated
-				continue;
-			}
-
-			toRemove.push(extensionDescription);
-		}
-
-		if (toAdd.length === 0 && toRemove.length === 0) {
-			return;
-		}
-
-		// Update the local registry
-		const result = this._registry.deltaExtensions(toAdd, toRemove.map(e => e.identifier));
-		this._onDidChangeExtensions.fire(undefined);
-
-		toRemove = toRemove.concat(result.removedDueToLooping);
-		if (result.removedDueToLooping.length > 0) {
-			this._logOrShowMessage(Severity.Error, nls.localize('looping', "The following extensions contain dependency loops and have been disabled: {0}", result.removedDueToLooping.map(e => `'${e.identifier.value}'`).join(', ')));
-		}
-
-		// enable or disable proposed API per extension
-		this._checkEnableProposedApi(toAdd);
-
-		// Update extension points
-		this._doHandleExtensionPoints((<IExtensionDescription[]>[]).concat(toAdd).concat(toRemove));
-
-		// Update the extension host
-		const localProcessExtensionHost = this._getExtensionHostManager(ExtensionHostKind.LocalProcess);
-		if (localProcessExtensionHost) {
-			await localProcessExtensionHost.deltaExtensions(toAdd, toRemove.map(e => e.identifier));
-		}
-
-		for (let i = 0; i < toAdd.length; i++) {
-			this._activateAddedExtensionIfNeeded(toAdd[i]);
-		}
-	}
-
-	public canAddExtension(extensionDescription: IExtensionDescription): boolean {
-		return this._canAddExtension(toExtension(extensionDescription));
-	}
-
-	private _canAddExtension(extension: IExtension): boolean {
+	protected _canAddExtension(extension: IExtension): boolean {
 		if (this._environmentService.configuration.remoteAuthority) {
 			return false;
 		}
@@ -266,18 +132,7 @@ export class ExtensionService extends AbstractExtensionService implements IExten
 			return false;
 		}
 
-		const extensionDescription = this._registry.getExtensionDescription(extension.identifier.id);
-		if (extensionDescription) {
-			// this extension is already running (most likely at a different version)
-			return false;
-		}
-
-		// Check if extension is renamed
-		if (extension.identifier.uuid && this._registry.getAllExtensionDescriptions().some(e => e.uuid === extension.identifier.uuid)) {
-			return false;
-		}
-
-		return true;
+		return super._canAddExtension(extension);
 	}
 
 	public canRemoveExtension(extension: IExtensionDescription): boolean {
@@ -289,88 +144,21 @@ export class ExtensionService extends AbstractExtensionService implements IExten
 			return false;
 		}
 
-		const extensionDescription = this._registry.getExtensionDescription(extension.identifier);
-		if (!extensionDescription) {
-			// ignore removing an extension which is not running
-			return false;
-		}
-
-		return this._canRemoveExtension(extensionDescription);
+		return super.canRemoveExtension(extension);
 	}
 
-	private _canRemoveExtension(extension: IExtensionDescription): boolean {
-		if (this._extensionHostActiveExtensions.has(ExtensionIdentifier.toKey(extension.identifier))) {
-			// Extension is running, cannot remove it safely
-			return false;
-		}
 
-		return true;
+	protected _scanSingleExtension(extension: IExtension): Promise<IExtensionDescription | null> {
+		return this._extensionScanner.scanSingleExtension(extension.location.fsPath, extension.type === ExtensionType.System, this.createLogger());
 	}
 
-	private async _activateAddedExtensionIfNeeded(extensionDescription: IExtensionDescription): Promise<void> {
-
-		let shouldActivate = false;
-		let shouldActivateReason: string | null = null;
-		let hasWorkspaceContains = false;
-		if (Array.isArray(extensionDescription.activationEvents)) {
-			for (let activationEvent of extensionDescription.activationEvents) {
-				// TODO@joao: there's no easy way to contribute this
-				if (activationEvent === 'onUri') {
-					activationEvent = `onUri:${ExtensionIdentifier.toKey(extensionDescription.identifier)}`;
-				}
-
-				if (this._allRequestedActivateEvents.has(activationEvent)) {
-					// This activation event was fired before the extension was added
-					shouldActivate = true;
-					shouldActivateReason = activationEvent;
-					break;
-				}
-
-				if (activationEvent === '*') {
-					shouldActivate = true;
-					shouldActivateReason = activationEvent;
-					break;
-				}
-
-				if (/^workspaceContains/.test(activationEvent)) {
-					hasWorkspaceContains = true;
-				}
-
-				if (activationEvent === 'onStartupFinished') {
-					shouldActivate = true;
-					shouldActivateReason = activationEvent;
-					break;
-				}
-			}
-		}
-
-		if (shouldActivate) {
-			await Promise.all(
-				this._extensionHostManagers.map(extHostManager => extHostManager.activate(extensionDescription.identifier, { startup: false, extensionId: extensionDescription.identifier, activationEvent: shouldActivateReason! }))
-			).then(() => { });
-		} else if (hasWorkspaceContains) {
-			const workspace = await this._contextService.getCompleteWorkspace();
-			const forceUsingSearch = !!this._environmentService.configuration.remoteAuthority;
-			const host: IWorkspaceContainsActivationHost = {
-				folders: workspace.folders.map(folder => folder.uri),
-				forceUsingSearch: forceUsingSearch,
-				exists: (path) => exists(path),
-				checkExists: (folders, includes, token) => this._instantiationService.invokeFunction((accessor) => checkGlobFileExists(accessor, folders, includes, token))
-			};
-
-			const result = await checkActivateWorkspaceContainsExtension(host, extensionDescription);
-			if (!result) {
-				return;
-			}
-
-			await Promise.all(
-				this._extensionHostManagers.map(extHostManager => extHostManager.activate(extensionDescription.identifier, { startup: false, extensionId: extensionDescription.identifier, activationEvent: result.activationEvent }))
-			).then(() => { });
+	protected async _updateExtensionsOnExtHosts(toAdd: IExtensionDescription[], toRemove: ExtensionIdentifier[]): Promise<void> {
+		const localProcessExtensionHost = this._getExtensionHostManager(ExtensionHostKind.LocalProcess);
+		if (localProcessExtensionHost) {
+			await localProcessExtensionHost.deltaExtensions(toAdd, toRemove);
 		}
 	}
 
-	//#endregion
-
 	private async _scanAllLocalExtensions(): Promise<IExtensionDescription[]> {
 		return flatten(await Promise.all([
 			this._extensionScanner.scannedExtensions,