70 lines
1.7 KiB
TypeScript
70 lines
1.7 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, InjectionToken, 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 = new InjectionToken<Array<() => void>>('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 resolve: Function;
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private reject: Function;
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private initialized = false;
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public readonly donePromise: Promise<any>;
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public readonly done = false;
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constructor(@Inject(APP_INITIALIZER) @Optional() private appInits: (() => any)[]) {
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this.donePromise = new Promise((res, rej) => {
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this.resolve = res;
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this.reject = rej;
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});
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}
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/** @internal */
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runInitializers() {
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if (this.initialized) {
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return;
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}
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const asyncInitPromises: Promise<any>[] = [];
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const complete = () => {
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(this as{done: boolean}).done = true;
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this.resolve();
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};
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if (this.appInits) {
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for (let i = 0; i < this.appInits.length; i++) {
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const initResult = this.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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Promise.all(asyncInitPromises).then(() => { complete(); }).catch(e => { this.reject(e); });
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if (asyncInitPromises.length === 0) {
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complete();
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}
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this.initialized = true;
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}
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}
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