@angular/core
Version:
Angular - the core framework
80 lines • 8.22 kB
JavaScript
/**
* @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 { __decorate, __metadata, __param } from "tslib";
import { isPromise } from '../src/util/lang';
import { Inject, Injectable, InjectionToken, Optional } from './di';
/**
* An injection token that allows you to provide one or more initialization functions.
* These function are injected at application startup and executed during
* app initialization. If any of these functions returns a Promise, initialization
* does not complete until the Promise is resolved.
*
* You can, for example, create a factory function that loads language data
* or an external configuration, and provide that function to the `APP_INITIALIZER` token.
* That way, the function is executed during the application bootstrap process,
* and the needed data is available on startup.
*
* @publicApi
*/
export var APP_INITIALIZER = new InjectionToken('Application Initializer');
/**
* A class that reflects the state of running {@link APP_INITIALIZER}s.
*
* @publicApi
*/
var ApplicationInitStatus = /** @class */ (function () {
function ApplicationInitStatus(appInits) {
var _this = this;
this.appInits = appInits;
this.initialized = false;
this.done = false;
this.donePromise = new Promise(function (res, rej) {
_this.resolve = res;
_this.reject = rej;
});
}
/** @internal */
ApplicationInitStatus.prototype.runInitializers = function () {
var _this = this;
if (this.initialized) {
return;
}
var asyncInitPromises = [];
var complete = function () {
_this.done = true;
_this.resolve();
};
if (this.appInits) {
for (var i = 0; i < this.appInits.length; i++) {
var initResult = this.appInits[i]();
if (isPromise(initResult)) {
asyncInitPromises.push(initResult);
}
}
}
Promise.all(asyncInitPromises)
.then(function () {
complete();
})
.catch(function (e) {
_this.reject(e);
});
if (asyncInitPromises.length === 0) {
complete();
}
this.initialized = true;
};
ApplicationInitStatus = __decorate([
Injectable(),
__param(0, Inject(APP_INITIALIZER)), __param(0, Optional()),
__metadata("design:paramtypes", [Array])
], ApplicationInitStatus);
return ApplicationInitStatus;
}());
export { ApplicationInitStatus };
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5pdFJlc3VsdCkpIHtcbiAgICAgICAgICBhc3luY0luaXRQcm9taXNlcy5wdXNoKGluaXRSZXN1bHQpO1xuICAgICAgICB9XG4gICAgICB9XG4gICAgfVxuXG4gICAgUHJvbWlzZS5hbGwoYXN5bmNJbml0UHJvbWlzZXMpXG4gICAgICAgIC50aGVuKCgpID0+IHtcbiAgICAgICAgICBjb21wbGV0ZSgpO1xuICAgICAgICB9KVxuICAgICAgICAuY2F0Y2goZSA9PiB7XG4gICAgICAgICAgdGhpcy5yZWplY3QoZSk7XG4gICAgICAgIH0pO1xuXG4gICAgaWYgKGFzeW5jSW5pdFByb21pc2VzLmxlbmd0aCA9PT0gMCkge1xuICAgICAgY29tcGxldGUoKTtcbiAgICB9XG4gICAgdGhpcy5pbml0aWFsaXplZCA9IHRydWU7XG4gIH1cbn1cbiJdfQ==