mirror of
https://github.com/angular/angular
synced 2026-05-24 09:28:37 +00:00
d169c2434e
- Introduce `InjectionToken<T>` which is a parameterized and type-safe
version of `OpaqueToken`.
DEPRECATION:
- `OpaqueToken` is now deprecated, use `InjectionToken<T>` instead.
- `Injector.get(token: any, notFoundValue?: any): any` is now deprecated
use the same method which is now overloaded as
`Injector.get<T>(token: Type<T>|InjectionToken<T>, notFoundValue?: T): T;`.
Migration
- Replace `OpaqueToken` with `InjectionToken<?>` and parameterize it.
- Migrate your code to only use `Type<?>` or `InjectionToken<?>` as
injection tokens. Using other tokens will not be supported in the
future.
BREAKING CHANGE:
- Because `injector.get()` is now parameterize it is possible that code
which used to work no longer type checks. Example would be if one
injects `Foo` but configures it as `{provide: Foo, useClass: MockFoo}`.
The injection instance will be that of `MockFoo` but the type will be
`Foo` instead of `any` as in the past. This means that it was possible
to call a method on `MockFoo` in the past which now will fail type
check. See this example:
```
class Foo {}
class MockFoo extends Foo {
setupMock();
}
var PROVIDERS = [
{provide: Foo, useClass: MockFoo}
];
...
function myTest(injector: Injector) {
var foo = injector.get(Foo);
// This line used to work since `foo` used to be `any` before this
// change, it will now be `Foo`, and `Foo` does not have `setUpMock()`.
// The fix is to downcast: `injector.get(Foo) as MockFoo`.
foo.setUpMock();
}
```
PR Close #13785
63 lines
1.8 KiB
TypeScript
63 lines
1.8 KiB
TypeScript
/**
|
|
* @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 {InjectionToken, Injector} from '@angular/core';
|
|
|
|
import {Metric} from '../metric';
|
|
|
|
export class MultiMetric extends Metric {
|
|
static provideWith(childTokens: any[]): any[] {
|
|
return [
|
|
{
|
|
provide: _CHILDREN,
|
|
useFactory: (injector: Injector) => childTokens.map(token => injector.get(token)),
|
|
deps: [Injector]
|
|
},
|
|
{
|
|
provide: MultiMetric,
|
|
useFactory: (children: Metric[]) => new MultiMetric(children),
|
|
deps: [_CHILDREN]
|
|
}
|
|
];
|
|
}
|
|
|
|
constructor(private _metrics: Metric[]) { super(); }
|
|
|
|
/**
|
|
* Starts measuring
|
|
*/
|
|
beginMeasure(): Promise<any> {
|
|
return Promise.all(this._metrics.map(metric => metric.beginMeasure()));
|
|
}
|
|
|
|
/**
|
|
* Ends measuring and reports the data
|
|
* since the begin call.
|
|
* @param restart: Whether to restart right after this.
|
|
*/
|
|
endMeasure(restart: boolean): Promise<{[key: string]: any}> {
|
|
return Promise.all(this._metrics.map(metric => metric.endMeasure(restart)))
|
|
.then(values => mergeStringMaps(<any>values));
|
|
}
|
|
|
|
/**
|
|
* Describes the metrics provided by this metric implementation.
|
|
* (e.g. units, ...)
|
|
*/
|
|
describe(): {[key: string]: any} {
|
|
return mergeStringMaps(this._metrics.map((metric) => metric.describe()));
|
|
}
|
|
}
|
|
|
|
function mergeStringMaps(maps: {[key: string]: string}[]): {[key: string]: string} {
|
|
const result: {[key: string]: string} = {};
|
|
maps.forEach(map => { Object.keys(map).forEach(prop => { result[prop] = map[prop]; }); });
|
|
return result;
|
|
}
|
|
|
|
const _CHILDREN = new InjectionToken('MultiMetric.children');
|