Adding source code for article tracked under BAEL-4080. (#9552)

Co-authored-by: CHANDRAKANT Kumar <kumar.chandrakant@soprabanking.com>

reactive-systems/frontend/src/app/app.component.html

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+<app-orders></app-orders>

reactive-systems/frontend/src/app/app.component.spec.ts

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+import { TestBed, async } from '@angular/core/testing';
+import { AppComponent } from './app.component';
+
+describe('AppComponent', () => {
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [
+        AppComponent
+      ],
+    }).compileComponents();
+  }));
+
+  it('should create the app', () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.componentInstance;
+    expect(app).toBeTruthy();
+  });
+
+  it(`should have as title 'frontend'`, () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.componentInstance;
+    expect(app.title).toEqual('frontend');
+  });
+
+  it('should render title', () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    fixture.detectChanges();
+    const compiled = fixture.nativeElement;
+    expect(compiled.querySelector('.content span').textContent).toContain('frontend app is running!');
+  });
+});

reactive-systems/frontend/src/app/app.component.ts

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+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-root',
+  templateUrl: './app.component.html',
+  styleUrls: ['./app.component.css']
+})
+export class AppComponent {
+  title = 'frontend';
+}

reactive-systems/frontend/src/app/app.module.ts

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+import { BrowserModule } from '@angular/platform-browser';
+import { NgModule } from '@angular/core';
+
+import { AppComponent } from './app.component';
+import { OrdersComponent } from './orders/orders.component';
+
+import { ReactiveFormsModule } from '@angular/forms';
+import { HttpClientModule } from '@angular/common/http';
+
+import { OrdersBlockingService } from './orders/orders-blocking.service';
+import { OrdersReactiveService } from './orders/orders-reactive.service';
+
+@NgModule({
+  declarations: [
+    AppComponent,
+    OrdersComponent
+  ],
+  imports: [
+    BrowserModule,
+    ReactiveFormsModule,
+    HttpClientModule
+  ],
+  providers: [
+    OrdersBlockingService,
+    OrdersReactiveService
+  ],
+  bootstrap: [AppComponent]
+})
+export class AppModule { }

reactive-systems/frontend/src/app/orders/orders-blocking.service.ts

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+import { Injectable } from '@angular/core';
+import { HttpClient } from "@angular/common/http";
+import { Observable } from 'rxjs';
+
+@Injectable()
+export class OrdersBlockingService {
+
+  url: string = 'http://localhost:8080/api/orders'
+
+  constructor(private http: HttpClient) {}
+
+  getOrders() {
+    return this.http.get(this.url)
+  }
+
+}

reactive-systems/frontend/src/app/orders/orders-reactive.service.ts

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+import { Injectable, NgZone } from '@angular/core';
+import { Observable } from 'rxjs';
+const EventSource: any = window['EventSource'];
+
+@Injectable()
+export class OrdersReactiveService {
+
+  url: string = 'http://localhost:8080/api/orders'
+
+  orders: string[] = []
+
+  constructor(private _zone: NgZone) {}
+
+  getOrderStream() {
+    this.orders = []
+    return Observable.create((observer) => {
+      let eventSource = new EventSource(this.url)
+      eventSource.onmessage = (event) => {
+        console.log('Received event: ', event)
+        let json = JSON.parse(event.data)
+        this.orders.push(json);
+        this._zone.run(() => {
+          observer.next(this.orders)
+        })
+      }
+      eventSource.onerror = (error) => {
+        if(eventSource.readyState === 0) {
+          console.log('The stream has been closed by the server.')
+          eventSource.close()
+          this._zone.run(() => {
+            observer.complete()
+          })
+        } else {
+          this._zone.run(() => {
+            observer.error('EventSource error: ' + error)
+          })
+        }
+      }
+    })
+  }
+
+}

reactive-systems/frontend/src/app/orders/orders.component.html

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+<div class="container">
+  <h2>Please place a new Order!</h2>
+</div>
+<div class="container" *ngIf="response !== null">
+  <h3>Your order {{response.id}} was successfully placed, please check the status of order.</h3>
+</div>
+<div class="container" *ngIf="error !== null">
+  <h3>Your order could not be placed at the moment: {{error.message}}</h3>
+</div>
+<div class="container">
+  <form [formGroup]="form" *ngIf="this.form" (ngSubmit)="createOrder()">
+    <h3 class="container">Product Quantities:</h3>
+    <div class="container" formArrayName="lineItems"
+         *ngFor="let item of form.get('lineItems')['controls']; let i = index;">
+      <li class="form-group input-group-lg" [formGroupName]="i">
+        {{ form.controls.lineItems['controls'][i].controls.name.value }}: <input formControlName='quantity' placeholder='10'>
+        <p>Only {{ form.controls.lineItems['controls'][i].controls.stock.value }} left in the stock!</p>
+      </li>
+    </div>
+    &nbsp;
+    <div class="container">
+      <h3>Payment Mode:
+      <select class="form-group input-group-lg" formControlName="paymentMode">
+        <option *ngFor="let paymentMode of paymentModes">
+          {{paymentMode}}
+        </option>
+      </select>
+      </h3>
+    </div>
+    &nbsp;
+    <div class="container" formGroupName="shippingAddress">
+      <h3>Address:</h3>
+      <input class="form-control" placeholder="Name" formControlName="name">
+      <input class="form-control" placeholder="House" formControlName="house">
+      <input class="form-control" placeholder="Street" formControlName="street">
+      <input class="form-control" placeholder="City" formControlName="city">
+      <input class="form-control" placeholder="Zip" formControlName="zip">
+    </div>
+    &nbsp;
+    <div class="form-group">
+      <button class="btn btn-danger btn-block btn-lg">Place Order</button>
+    </div>
+  </form>
+</div>
+
+<div class="container">
+  <button class="btn btn-danger btn-block btn-lg" (click)="getOrders()">Get Previous Orders</button>
+</div>
+
+<div class="container">
+  <button class="btn btn-danger btn-block btn-lg" (click)="getOrderStream()">Get Previous Order Stream </button>
+</div>
+<div class="container" *ngIf="previousOrders !== null">
+  <h2>Your orders placed so far:</h2>
+  <ul>
+    <li *ngFor="let order of previousOrders | async">
+      <p>Order ID: {{ order.id }}, Order Status: {{order.orderStatus}}, Order Message: {{order.responseMessage}}</p>
+    </li>
+  </ul>
+</div>

reactive-systems/frontend/src/app/orders/orders.component.spec.ts

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+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { OrdersComponent } from './orders.component';
+
+describe('OrdersComponent', () => {
+  let component: OrdersComponent;
+  let fixture: ComponentFixture<OrdersComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ OrdersComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(OrdersComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

reactive-systems/frontend/src/app/orders/orders.component.ts

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+import { Component, OnInit } from '@angular/core';
+import { FormBuilder, FormGroup, FormControl, FormArray } from "@angular/forms";
+import { HttpClient, HttpHeaders } from '@angular/common/http';
+import { Observable } from 'rxjs';
+import { OrdersBlockingService } from './orders-blocking.service';
+import { OrdersReactiveService } from './orders-reactive.service';
+
+@Component({
+  selector: 'app-orders',
+  templateUrl: './orders.component.html',
+  styleUrls: ['./orders.component.css']
+})
+
+export class OrdersComponent implements OnInit {
+  form: FormGroup
+  response: any
+  error: any
+  previousOrders: Observable<Object>
+  itemList: any
+  paymentModes: any
+
+  constructor(public fb: FormBuilder, private http: HttpClient,
+    private ordersBlockingService: OrdersBlockingService,
+    private ordersReactiveService: OrdersReactiveService) {
+      this.paymentModes = this.fetchPaymentModes()
+      this.fetchProducts().then(data => this.form = this.createForm());
+  }
+
+  ngOnInit() {
+      this.response = null
+      this.error = null
+      this.previousOrders = null
+  }
+
+  createForm() {
+      let fb = this.fb
+      let form = fb.group({
+        userId: 'Bob Marley',
+        paymentMode: [this.paymentModes[0]],
+        lineItems: this.fb.array([]),
+        shippingAddress: this.fb.group({
+          name: ['Bob Marley'],
+          house: ['24'],
+          street: ['Ashford Av.'],
+          city: ['New York'],
+          zip: ['11001']
+        })
+      })
+      let items = this.itemList
+      items.forEach(function (value, index) {
+        (<FormArray>form.get('lineItems')).push(fb.group({
+          'productId':items[index].id,
+          'name': items[index].name,
+          'stock': items[index].stock,
+          'quantity': 10}
+        ))
+      });
+      return form
+  }
+
+  async fetchProducts() {
+      let products = [
+        {"id":"p001", "name": "Product A1", "stock": 101},
+        {"id":"p002", "name": "Product A2", "stock": 102}
+      ]
+      let data  = await this.http.get('http://localhost:8081/api/products').toPromise()
+      this.itemList = data
+  }
+
+  fetchPaymentModes() {
+      let paymentModes = ["Cash on Delivery", "Card on Delivery"]
+      return paymentModes
+  }
+
+  createOrder() {
+      let headers = new HttpHeaders({
+        'Content-Type': 'application/json'
+      });
+      let options = {
+        headers: headers
+      }
+      this.http.post('http://localhost:8080/api/orders', this.form.value, options).subscribe(
+        (response) => {
+          console.log(response)
+          this.error = null
+          this.response = response
+        },
+        (error) => {
+          console.log(error)
+          this.response = null
+          this.error = error
+        }
+      )
+  }
+
+  getOrders() {
+      this.previousOrders = this.ordersBlockingService.getOrders()
+  }
+
+  getOrderStream() {
+      this.previousOrders = this.ordersReactiveService.getOrderStream()
+  }
+
+}

reactive-systems/frontend/src/environments/environment.prod.ts

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+export const environment = {
+  production: true
+};

reactive-systems/frontend/src/environments/environment.ts

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+// This file can be replaced during build by using the `fileReplacements` array.
+// `ng build --prod` replaces `environment.ts` with `environment.prod.ts`.
+// The list of file replacements can be found in `angular.json`.
+
+export const environment = {
+  production: false
+};
+
+/*
+ * For easier debugging in development mode, you can import the following file
+ * to ignore zone related error stack frames such as `zone.run`, `zoneDelegate.invokeTask`.
+ *
+ * This import should be commented out in production mode because it will have a negative impact
+ * on performance if an error is thrown.
+ */
+// import 'zone.js/dist/zone-error';  // Included with Angular CLI.

reactive-systems/frontend/src/index.html

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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <title>Frontend</title>
+  <base href="/">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="icon" type="image/x-icon" href="favicon.ico">
+</head>
+<body>
+  <app-root></app-root>
+</body>
+</html>

reactive-systems/frontend/src/main.ts

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+import { enableProdMode } from '@angular/core';
+import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
+
+import { AppModule } from './app/app.module';
+import { environment } from './environments/environment';
+
+if (environment.production) {
+  enableProdMode();
+}
+
+platformBrowserDynamic().bootstrapModule(AppModule)
+  .catch(err => console.error(err));

reactive-systems/frontend/src/polyfills.ts

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+/**
+ * This file includes polyfills needed by Angular and is loaded before the app.
+ * You can add your own extra polyfills to this file.
+ *
+ * This file is divided into 2 sections:
+ *   1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
+ *   2. Application imports. Files imported after ZoneJS that should be loaded before your main
+ *      file.
+ *
+ * The current setup is for so-called "evergreen" browsers; the last versions of browsers that
+ * automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),
+ * Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.
+ *
+ * Learn more in https://angular.io/guide/browser-support
+ */
+
+/***************************************************************************************************
+ * BROWSER POLYFILLS
+ */
+
+/** IE10 and IE11 requires the following for NgClass support on SVG elements */
+// import 'classlist.js';  // Run `npm install --save classlist.js`.
+
+/**
+ * Web Animations `@angular/platform-browser/animations`
+ * Only required if AnimationBuilder is used within the application and using IE/Edge or Safari.
+ * Standard animation support in Angular DOES NOT require any polyfills (as of Angular 6.0).
+ */
+// import 'web-animations-js';  // Run `npm install --save web-animations-js`.
+
+/**
+ * By default, zone.js will patch all possible macroTask and DomEvents
+ * user can disable parts of macroTask/DomEvents patch by setting following flags
+ * because those flags need to be set before `zone.js` being loaded, and webpack
+ * will put import in the top of bundle, so user need to create a separate file
+ * in this directory (for example: zone-flags.ts), and put the following flags
+ * into that file, and then add the following code before importing zone.js.
+ * import './zone-flags';
+ *
+ * The flags allowed in zone-flags.ts are listed here.
+ *
+ * The following flags will work for all browsers.
+ *
+ * (window as any).__Zone_disable_requestAnimationFrame = true; // disable patch requestAnimationFrame
+ * (window as any).__Zone_disable_on_property = true; // disable patch onProperty such as onclick
+ * (window as any).__zone_symbol__UNPATCHED_EVENTS = ['scroll', 'mousemove']; // disable patch specified eventNames
+ *
+ *  in IE/Edge developer tools, the addEventListener will also be wrapped by zone.js
+ *  with the following flag, it will bypass `zone.js` patch for IE/Edge
+ *
+ *  (window as any).__Zone_enable_cross_context_check = true;
+ *
+ */
+
+/***************************************************************************************************
+ * Zone JS is required by default for Angular itself.
+ */
+import 'zone.js/dist/zone';  // Included with Angular CLI.
+
+
+/***************************************************************************************************
+ * APPLICATION IMPORTS
+ */

reactive-systems/frontend/src/styles.css

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+/* You can add global styles to this file, and also import other style files */

reactive-systems/frontend/src/test.ts

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+// This file is required by karma.conf.js and loads recursively all the .spec and framework files
+
+import 'zone.js/dist/zone-testing';
+import { getTestBed } from '@angular/core/testing';
+import {
+  BrowserDynamicTestingModule,
+  platformBrowserDynamicTesting
+} from '@angular/platform-browser-dynamic/testing';
+
+declare const require: {
+  context(path: string, deep?: boolean, filter?: RegExp): {
+    keys(): string[];
+    <T>(id: string): T;
+  };
+};
+
+// First, initialize the Angular testing environment.
+getTestBed().initTestEnvironment(
+  BrowserDynamicTestingModule,
+  platformBrowserDynamicTesting()
+);
+// Then we find all the tests.
+const context = require.context('./', true, /\.spec\.ts$/);
+// And load the modules.
+context.keys().map(context);