Angular components communication using service

exemplo1.component.ts

import { Component, OnInit } from '@angular/core';
import { NotificationService } from './notification.service';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class Exemplo1Component implements OnInit {

  ngOnInit() {
    NotificationService.get('evento_fake').subscribe( (eventData) => {
      const { comp, data} = eventData;
      console.log(`qual componente? ${comp} - data: ${data} `);
    });
  }

  operacaoFake() {
    NotificationService.emit('evento_fake', {
      comp: 'exemplo1',
      data: 'whatever you want send goes here'
    });
  }
}

exemplo2.component.ts

import { Component, OnInit } from '@angular/core';
import { NotificationService } from './notification.service';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class Exemplo2Component implements OnInit {

  ngOnInit() {
    NotificationService.get('evento_fake').subscribe( (eventData) => {
      const { comp, data} = eventData;
      console.log(`qual componente? ${comp} - data: ${data} `);
    });
  }

  operacaoFake() {
    NotificationService.emit('evento_fake', {
      comp: 'exemplo2',
      data: {
        test1: 'test1'
        val: 50;
      }
    });
  }
}

notification.service.ts

import { Injectable, EventEmitter } from '@angular/core';


/**
 * Notification service
 * Used to provide communication between components or services
 */
@Injectable()
export class NotificationService {

  /**
   * Declare and initializes the emitter object
   */
  private static emitters: { [eventName: string]: EventEmitter<any> } = {};

  /**
   * Gets notification service
   * @param eventName name of event to subscribe
   * @returns the event emitter
   */
  static get(eventName: string): EventEmitter<any> {
    if (!this.emitters[eventName]) {
      this.emitters[eventName] = new EventEmitter<any>();
    }
    return this.emitters[eventName];
  }

  /**
   * Emits notification service
   * @param eventName name of event to be fired
   * @param data event data content
   */
  static emit(eventName: string, data: any): void {
    NotificationService.get(eventName).emit(data);
  }