/
application_init.ts
49 lines (41 loc) 路 1.32 KB
/
application_init.ts
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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {isPromise} from '../src/util/lang';
import {Inject, Injectable, InjectionToken, Optional} from './di';
/**
* A function that will be executed when an application is initialized.
* @experimental
*/
export const APP_INITIALIZER = new InjectionToken<Array<() => void>>('Application Initializer');
/**
* A class that reflects the state of running {@link APP_INITIALIZER}s.
*
* @experimental
*/
@Injectable()
export class ApplicationInitStatus {
private _donePromise: Promise<any>;
private _done = false;
constructor(@Inject(APP_INITIALIZER) @Optional() appInits: (() => any)[]) {
const asyncInitPromises: Promise<any>[] = [];
if (appInits) {
for (let i = 0; i < appInits.length; i++) {
const initResult = appInits[i]();
if (isPromise(initResult)) {
asyncInitPromises.push(initResult);
}
}
}
this._donePromise = Promise.all(asyncInitPromises).then(() => { this._done = true; });
if (asyncInitPromises.length === 0) {
this._done = true;
}
}
get done(): boolean { return this._done; }
get donePromise(): Promise<any> { return this._donePromise; }
}