Cache integrity computation

src/vs/platform/integrity/node/integrityServiceImpl.ts

@@ -66,6 +66,7 @@ export class IntegrityServiceImpl implements IIntegrityService {
 	private _messageService: IMessageService;
 	private _storage:IntegrityStorage;
 	private _loaderChecksums: ILoaderChecksums;
+	private _isPurePromise: TPromise<IntegrityTestResult>;
 
 	constructor(
 		@IMessageService messageService: IMessageService,
@@ -84,6 +85,8 @@ export class IntegrityServiceImpl implements IIntegrityService {
 			this._loaderChecksums[scriptUri.toString()] = loaderChecksums[scriptSrc];
 		});
 
+		this._isPurePromise = this._isPure();
+
 		this.isPure().then(r => {
 			if (r.isPure) {
 				// all is good
@@ -127,6 +130,10 @@ export class IntegrityServiceImpl implements IIntegrityService {
 	}
 
 	public isPure(): TPromise<IntegrityTestResult> {
+		return this._isPurePromise;
+	}
+
+	private _isPure(): TPromise<IntegrityTestResult> {
 		const expectedChecksums = product.checksums || {};
 		let syncResults: ChecksumPair[] = [];
 		let asyncResults: TPromise<ChecksumPair>[] = [];