async loader

async-loader.ts

import { LoaderFactory } from '../services/loaderFactory.service';

/**
 * - Startet beim Aufruf der Methode die loading Animation.
 * - Stoppt die Animation, wenn der Promise erfüllt wird.
 */
export const asyncLoader = () => {
  return (target: any, propertyKey: string, descriptor: PropertyDescriptor) => {
    const originalMethod: Function = descriptor.value;
    descriptor.value = function (...args: any[]) {
      const result: Promise<any> = originalMethod.apply(this, args);
      LoaderFactory.getService().isLoading.next(true);
      result.finally(() => LoaderFactory.getService().isLoading.next(false));
      return result;
    };
    return descriptor;
  };
};