Update folder structure

src/app/service/app.menu.service.ts

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+import { Injectable } from '@angular/core';
+import { Subject } from 'rxjs';
+
+@Injectable()
+export class MenuService {
+
+    private menuSource = new Subject<string>();
+    private resetSource = new Subject();
+
+    menuSource$ = this.menuSource.asObservable();
+    resetSource$ = this.resetSource.asObservable();
+
+    onMenuStateChange(key: string) {
+        this.menuSource.next(key);
+    }
+
+    reset() {
+    //    this.resetSource.next(true);
+    }
+}

src/app/service/countryservice.ts

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+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+
+@Injectable()
+export class CountryService {
+
+    constructor(private http: HttpClient) { }
+
+    getCountries() {
+    return this.http.get<any>('assets/demo/data/countries.json')
+      .toPromise()
+      .then(res => res.data as any[])
+      .then(data => data);
+    }
+}

src/app/service/customerservice.ts

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+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+import { Customer } from '../api/customer';
+
+@Injectable()
+export class CustomerService {
+
+    constructor(private http: HttpClient) { }
+
+    getCustomersSmall() {
+        return this.http.get<any>('assets/demo/data/customers-small.json')
+            .toPromise()
+            .then(res => res.data as Customer[])
+            .then(data => data);
+    }
+
+    getCustomersMedium() {
+        return this.http.get<any>('assets/demo/data/customers-medium.json')
+            .toPromise()
+            .then(res => res.data as Customer[])
+            .then(data => data);
+    }
+
+    getCustomersLarge() {
+        return this.http.get<any>('assets/demo/data/customers-large.json')
+            .toPromise()
+            .then(res => res.data as Customer[])
+            .then(data => data);
+    }
+
+}

src/app/service/eventservice.ts

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+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+
+@Injectable()
+export class EventService {
+
+    constructor(private http: HttpClient) { }
+
+    getEvents() {
+    return this.http.get<any>('assets/demo/data/scheduleevents.json')
+      .toPromise()
+      .then(res => res.data as any[])
+      .then(data => data);
+    }
+}

src/app/service/iconservice.ts

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+import { Injectable } from '@angular/core';
+import { HttpClient, HttpHeaders } from '@angular/common/http';
+import {map} from 'rxjs/operators';
+
+@Injectable()
+export class IconService {
+
+    constructor(private http: HttpClient) { }
+
+    icons: any[];
+
+    selectedIcon: any;
+
+    apiUrl = 'assets/demo/data/icons.json';
+
+    getIcons() {
+        return this.http.get(this.apiUrl).pipe(map((response: any) => {
+            this.icons = response.icons;
+            return this.icons;
+        }));
+    }
+}

src/app/service/nodeservice.ts

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+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+
+import { TreeNode } from 'primeng/api';
+
+@Injectable()
+export class NodeService {
+
+    constructor(private http: HttpClient) { }
+
+    getFiles() {
+    return this.http.get<any>('assets/demo/data/files.json')
+      .toPromise()
+      .then(res => res.data as TreeNode[]);
+    }
+
+    getLazyFiles() {
+    return this.http.get<any>('assets/demo/data/files-lazy.json')
+      .toPromise()
+      .then(res => res.data as TreeNode[]);
+    }
+
+    getFilesystem() {
+    return this.http.get<any>('assets/demo/data/filesystem.json')
+      .toPromise()
+      .then(res => res.data as TreeNode[]);
+    }
+
+    getLazyFilesystem() {
+    return this.http.get<any>('assets/demo/data/filesystem-lazy.json')
+      .toPromise()
+      .then(res => res.data as TreeNode[]);
+    }
+}

src/app/service/photoservice.ts

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+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+
+import { Image } from '../api/image';
+
+@Injectable()
+export class PhotoService {
+
+    constructor(private http: HttpClient) { }
+
+    getImages() {
+    return this.http.get<any>('assets/demo/data/photos.json')
+      .toPromise()
+      .then(res => res.data as Image[])
+      .then(data => data);
+    }
+}

src/app/service/productservice.ts

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+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+
+import { Product } from '../api/product';
+
+@Injectable()
+export class ProductService {
+
+    constructor(private http: HttpClient) { }
+
+    getProductsSmall() {
+        return this.http.get<any>('assets/demo/data/products-small.json')
+        .toPromise()
+        .then(res => res.data as Product[])
+        .then(data => data);
+    }
+
+    getProducts() {
+        return this.http.get<any>('assets/demo/data/products.json')
+        .toPromise()
+        .then(res => res.data as Product[])
+        .then(data => data);
+    }
+
+    getProductsMixed() {
+        return this.http.get<any>('assets/demo/data/products-mixed.json')
+        .toPromise()
+        .then(res => res.data as Product[])
+        .then(data => data);
+    }
+
+    getProductsWithOrdersSmall() {
+        return this.http.get<any>('assets/demo/data/products-orders-small.json')
+        .toPromise()
+        .then(res => res.data as Product[])
+        .then(data => data);
+    }
+}