dynamic-widget-component-factory.service.ts
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///
/// Copyright © 2016-2019 The Thingsboard Authors
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
/// http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
import {
Compiler,
Component,
ComponentFactory,
Injectable,
Injector,
NgModule,
NgModuleRef,
Type,
ViewEncapsulation
} from '@angular/core';
import {
DynamicWidgetComponent,
DynamicWidgetComponentModule
} from '@home/components/widget/dynamic-widget.component';
import { CommonModule } from '@angular/common';
import { SharedModule } from '@shared/shared.module';
import { Observable, ReplaySubject } from 'rxjs';
import { HomeComponentsModule } from '../home-components.module';
import { WidgetComponentsModule } from './widget-components.module';
interface DynamicWidgetComponentModuleData {
moduleRef: NgModuleRef<DynamicWidgetComponentModule>;
moduleType: Type<DynamicWidgetComponentModule>;
}
@Injectable()
export class DynamicWidgetComponentFactoryService {
private dynamicComponentModulesMap = new Map<ComponentFactory<DynamicWidgetComponent>, DynamicWidgetComponentModuleData>();
constructor(private compiler: Compiler,
private injector: Injector) {
}
public createDynamicWidgetComponentFactory(template: string): Observable<ComponentFactory<DynamicWidgetComponent>> {
const dymamicWidgetComponentFactorySubject = new ReplaySubject<ComponentFactory<DynamicWidgetComponent>>();
const comp = this.createDynamicWidgetComponent(template);
// noinspection AngularInvalidImportedOrDeclaredSymbol,AngularInvalidEntryComponent
@NgModule({
declarations: [comp],
entryComponents: [comp],
imports: [CommonModule, SharedModule, WidgetComponentsModule],
})
class DynamicWidgetComponentInstanceModule extends DynamicWidgetComponentModule {}
this.compiler.compileModuleAsync(DynamicWidgetComponentInstanceModule).then(
(module) => {
const moduleRef = module.create(this.injector);
const factory = moduleRef.componentFactoryResolver.resolveComponentFactory(comp);
this.dynamicComponentModulesMap.set(factory, {
moduleRef,
moduleType: module.moduleType
});
dymamicWidgetComponentFactorySubject.next(factory);
dymamicWidgetComponentFactorySubject.complete();
}
).catch(
(e) => {
dymamicWidgetComponentFactorySubject.error(`Failed to create dynamic widget component factory: ${e}`);
}
);
return dymamicWidgetComponentFactorySubject.asObservable();
}
public destroyDynamicWidgetComponentFactory(factory: ComponentFactory<DynamicWidgetComponent>) {
const moduleData = this.dynamicComponentModulesMap.get(factory);
if (moduleData) {
moduleData.moduleRef.destroy();
this.compiler.clearCacheFor(moduleData.moduleType);
this.dynamicComponentModulesMap.delete(factory);
}
}
private createDynamicWidgetComponent(template: string): Type<DynamicWidgetComponent> {
// noinspection AngularMissingOrInvalidDeclarationInModule
@Component({
template
})
class DynamicWidgetInstanceComponent extends DynamicWidgetComponent { }
return DynamicWidgetInstanceComponent;
}
}