/*
 * 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 {Observable, Subscription} from "rxjs";
import {Message} from "@stomp/stompjs";
import {RxStompService} from "@stomp/ng2-stompjs";

@Injectable()
export class WebsocketService {

    subscription: Subscription;

    constructor(private rxStompService: RxStompService) {
    }

    connect(url, topic): Observable<any> {
        return new Observable<any>(observable => {
            this.subscription = this.rxStompService.watch("/topic/" +topic).subscribe((message: Message) => {
                observable.next(JSON.parse(message.body));
            });
        });
    }

}