Add profile scope, expose start and stop methods events service

projects/common/src/fm/services/event.service.ts

@@ -2,7 +2,7 @@ import { Injectable } from '@angular/core';
 import { IEventMessage } from '../models/event.message';
 import { Subject, timer } from 'rxjs';
 import { OAuthService } from 'angular-oauth2-oidc';
-import { HubConnection, HubConnectionBuilder, LogLevel ,HttpTransportType} from '@microsoft/signalr';
+import { HubConnection, HubConnectionBuilder, LogLevel ,HttpTransportType,HubConnectionState} from '@microsoft/signalr';
 import { AppConfig } from "../shared/app.config";
 
 
@@ -31,12 +31,17 @@ export class EventService {
     this._connection.onreconnected( event => {
       this.Authenticate();
     });
-    this._connection.start().then(() => {
-      this.Authenticate();
-    });  
+    this.Start();
   }
 
-  Authenticate() {
+  Start() {
+    if(this._connection&&!(this._connection.state === HubConnectionState.Connected || this._connection.state === HubConnectionState.Connecting))
+    this._connection.start().then(() => {
+      this.Authenticate();
+    }); 
+  }
+
+  private Authenticate() {
     var accessToken = this.oauthService.getAccessToken();
     if (accessToken) {
       this._connection.send('authenticate', this.oauthService.getAccessToken());
@@ -48,4 +53,10 @@ export class EventService {
        }, 800);
     }
   }
+
+  Stop() {
+    if(this._connection&&(this._connection.state === HubConnectionState.Connected || this._connection.state === HubConnectionState.Connecting)) {
+      this._connection.stop();
+    }
+  }
 }