@angular/cdk
Version:
Angular Material Component Development Kit
82 lines • 13.3 kB
JavaScript
/**
* @license
* Copyright Google LLC 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 { BehaviorSubject } from 'rxjs';
/** Unique symbol that is used to patch a property to a proxy zone. */
const stateObservableSymbol = Symbol('ProxyZone_PATCHED#stateObservable');
/**
* Interceptor that can be set up in a `ProxyZone` instance. The interceptor
* will keep track of the task state and emit whenever the state changes.
*
* This serves as a workaround for https://github.com/angular/angular/issues/32896.
*/
export class TaskStateZoneInterceptor {
constructor(_lastState) {
this._lastState = _lastState;
/** Subject that can be used to emit a new state change. */
this._stateSubject = new BehaviorSubject(this._lastState ? this._getTaskStateFromInternalZoneState(this._lastState) : { stable: true });
/** Public observable that emits whenever the task state changes. */
this.state = this._stateSubject.asObservable();
}
/** This will be called whenever the task state changes in the intercepted zone. */
onHasTask(delegate, current, target, hasTaskState) {
if (current === target) {
this._stateSubject.next(this._getTaskStateFromInternalZoneState(hasTaskState));
}
}
/** Gets the task state from the internal ZoneJS task state. */
_getTaskStateFromInternalZoneState(state) {
return { stable: !state.macroTask && !state.microTask };
}
/**
* Sets up the custom task state Zone interceptor in the `ProxyZone`. Throws if
* no `ProxyZone` could be found.
* @returns an observable that emits whenever the task state changes.
*/
static setup() {
if (Zone === undefined) {
throw Error('Could not find ZoneJS. For test harnesses running in TestBed, ' +
'ZoneJS needs to be installed.');
}
// tslint:disable-next-line:variable-name
const ProxyZoneSpec = Zone['ProxyZoneSpec'];
// If there is no "ProxyZoneSpec" installed, we throw an error and recommend
// setting up the proxy zone by pulling in the testing bundle.
if (!ProxyZoneSpec) {
throw Error('ProxyZoneSpec is needed for the test harnesses but could not be found. ' +
'Please make sure that your environment includes zone.js/dist/zone-testing.js');
}
// Ensure that there is a proxy zone instance set up, and get
// a reference to the instance if present.
const zoneSpec = ProxyZoneSpec.assertPresent();
// If there already is a delegate registered in the proxy zone, and it
// is type of the custom task state interceptor, we just use that state
// observable. This allows us to only intercept Zone once per test
// (similar to how `fakeAsync` or `async` work).
if (zoneSpec[stateObservableSymbol]) {
return zoneSpec[stateObservableSymbol];
}
// Since we intercept on environment creation and the fixture has been
// created before, we might have missed tasks scheduled before. Fortunately
// the proxy zone keeps track of the previous task state, so we can just pass
// this as initial state to the task zone interceptor.
const interceptor = new TaskStateZoneInterceptor(zoneSpec.lastTaskState);
const zoneSpecOnHasTask = zoneSpec.onHasTask.bind(zoneSpec);
// We setup the task state interceptor in the `ProxyZone`. Note that we cannot register
// the interceptor as a new proxy zone delegate because it would mean that other zone
// delegates (e.g. `FakeAsyncTestZone` or `AsyncTestZone`) can accidentally overwrite/disable
// our interceptor. Since we just intend to monitor the task state of the proxy zone, it is
// sufficient to just patch the proxy zone. This also avoids that we interfere with the task
// queue scheduling logic.
zoneSpec.onHasTask = function (...args) {
zoneSpecOnHasTask(...args);
interceptor.onHasTask(...args);
};
return zoneSpec[stateObservableSymbol] = interceptor.state;
}
}
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The interceptor\n * will keep track of the task state and emit whenever the state changes.\n *\n * This serves as a workaround for https://github.com/angular/angular/issues/32896.\n */\nexport class TaskStateZoneInterceptor {\n  /** Subject that can be used to emit a new state change. */\n  private _stateSubject: BehaviorSubject<TaskState> = new BehaviorSubject<TaskState>(\n      this._lastState ? this._getTaskStateFromInternalZoneState(this._lastState) : {stable: true});\n\n  /** Public observable that emits whenever the task state changes. */\n  readonly state: Observable<TaskState> = this._stateSubject.asObservable();\n\n  constructor(private _lastState: HasTaskState|null) {}\n\n  /** This will be called whenever the task state changes in the intercepted zone. */\n  onHasTask(delegate: ZoneDelegate, current: Zone, target: Zone, hasTaskState: HasTaskState) {\n    if (current === target) {\n      this._stateSubject.next(this._getTaskStateFromInternalZoneState(hasTaskState));\n    }\n  }\n\n  /** Gets the task state from the internal ZoneJS task state. */\n  private _getTaskStateFromInternalZoneState(state: HasTaskState): TaskState {\n    return {stable: !state.macroTask && !state.microTask};\n  }\n\n  /**\n   * Sets up the custom task state Zone interceptor in the  `ProxyZone`. Throws if\n   * no `ProxyZone` could be found.\n   * @returns an observable that emits whenever the task state changes.\n   */\n  static setup(): Observable<TaskState> {\n    if (Zone === undefined) {\n      throw Error('Could not find ZoneJS. For test harnesses running in TestBed, ' +\n        'ZoneJS needs to be installed.');\n    }\n\n    // tslint:disable-next-line:variable-name\n    const ProxyZoneSpec = (Zone as any)['ProxyZoneSpec'] as ProxyZoneStatic|undefined;\n\n    // If there is no \"ProxyZoneSpec\" installed, we throw an error and recommend\n    // setting up the proxy zone by pulling in the testing bundle.\n    if (!ProxyZoneSpec) {\n      throw Error(\n        'ProxyZoneSpec is needed for the test harnesses but could not be found. ' +\n        'Please make sure that your environment includes zone.js/dist/zone-testing.js');\n    }\n\n    // Ensure that there is a proxy zone instance set up, and get\n    // a reference to the instance if present.\n    const zoneSpec = ProxyZoneSpec.assertPresent() as PatchedProxyZone;\n\n    // If there already is a delegate registered in the proxy zone, and it\n    // is type of the custom task state interceptor, we just use that state\n    // observable. This allows us to only intercept Zone once per test\n    // (similar to how `fakeAsync` or `async` work).\n    if (zoneSpec[stateObservableSymbol]) {\n      return zoneSpec[stateObservableSymbol]!;\n    }\n\n    // Since we intercept on environment creation and the fixture has been\n    // created before, we might have missed tasks scheduled before. Fortunately\n    // the proxy zone keeps track of the previous task state, so we can just pass\n    // this as initial state to the task zone interceptor.\n    const interceptor = new TaskStateZoneInterceptor(zoneSpec.lastTaskState);\n    const zoneSpecOnHasTask = zoneSpec.onHasTask.bind(zoneSpec);\n\n    // We setup the task state interceptor in the `ProxyZone`. Note that we cannot register\n    // the interceptor as a new proxy zone delegate because it would mean that other zone\n    // delegates (e.g. `FakeAsyncTestZone` or `AsyncTestZone`) can accidentally overwrite/disable\n    // our interceptor. Since we just intend to monitor the task state of the proxy zone, it is\n    // sufficient to just patch the proxy zone. This also avoids that we interfere with the task\n    // queue scheduling logic.\n    zoneSpec.onHasTask = function(...args: [ZoneDelegate, Zone, Zone, HasTaskState]) {\n      zoneSpecOnHasTask(...args);\n      interceptor.onHasTask(...args);\n    };\n\n    return zoneSpec[stateObservableSymbol] = interceptor.state;\n  }\n}\n"]}