将允许的类型动态修改为效果

Question

我有一个通知模块（如下所示），根据来自其他模块的传入操作显示snackbar。例如'[Product] item added'，'[Product] item removed'等。这些actionTypes使用动作'AddTrigger'动态添加到NotificationState'触发器'。在Notification Effects下，我订阅了'触发'状态，并通过将更新的allowedTypes作为参数传递给'ofType'函数来动态修改'show $'效果。

代码

@Injectable()
export class NotificationEffect
{
    @Effect() public show$: Observable<Action>;

    constructor (
        private actions$: Actions,
        private store: Store<NotificationModuleState>,
        private matSnackBar: MatSnackBar
    )
    {
        this.store.select( state => state.notificationState.triggers )
            .subscribe( triggers =>
            {
                this.show$ = this.actions$.ofType( ...triggers )
                    .map( action => this.matSnackBar.open( 'Dynamic notification', 'Ok', { duration: 5000 } ) )
                    .switchMap( snackBar => snackBar.afterDismissed() )
                    .map( closed => new NotificationAction.Closed() );
            } )
    }

}