50 lines
1.3 KiB
TypeScript
50 lines
1.3 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {isPromise} from '../src/util/lang';
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import {Inject, Injectable, OpaqueToken, Optional} from './di';
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/**
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* A function that will be executed when an application is initialized.
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* @experimental
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*/
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export const APP_INITIALIZER: any = new OpaqueToken('Application Initializer');
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/**
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* A class that reflects the state of running {@link APP_INITIALIZER}s.
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*
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* @experimental
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*/
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@Injectable()
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export class ApplicationInitStatus {
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private _donePromise: Promise<any>;
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private _done = false;
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constructor(@Inject(APP_INITIALIZER) @Optional() appInits: (() => any)[]) {
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const asyncInitPromises: Promise<any>[] = [];
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if (appInits) {
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for (let i = 0; i < appInits.length; i++) {
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const initResult = appInits[i]();
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if (isPromise(initResult)) {
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asyncInitPromises.push(initResult);
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}
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}
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}
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this._donePromise = Promise.all(asyncInitPromises).then(() => { this._done = true; });
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if (asyncInitPromises.length === 0) {
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this._done = true;
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}
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}
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get done(): boolean { return this._done; }
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get donePromise(): Promise<any> { return this._donePromise; }
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}
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