src/app/services/notification/notification.service.ts

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 {Injectable} from '@angular/core';
import {BehaviorSubject} from 'rxjs/BehaviorSubject';

export enum NotificationType {
  MESSAGE, ALERT
}

export interface NotificationEvent {
  type: NotificationType;
  title?: string;
  message: string;
}

@Injectable()
export class NotificationService {

  private notificationSource = new BehaviorSubject<NotificationEvent>(null);

  notifications$ = this.notificationSource.asObservable();

  send(notification: NotificationEvent) {
    this.notificationSource.next(notification);
  }
}