no crash if double starting in HttpListener

phnx47 · phnx47 · commit 1b40036cdf0b · 2018-02-23T23:23:30.000+03:00
diff --git a/src/Prometheus.Client.MetricServer/MetricServer.HttpListener.cs b/src/Prometheus.Client.MetricServer/MetricServer.HttpListener.cs
@@ -68,6 +68,9 @@ public MetricServer(string hostname, int port, string url, IEnumerable<IOnDemand
         /// <inheritdoc />
         public void Start()
         {
+            if (IsRunning)
+                return;
+            
             var bgThread = new Thread(StartListen)
             {
                 IsBackground = true,

Original file line number	Diff line number	Diff line change
`@@ -68,6 +68,9 @@ public MetricServer(string hostname, int port, string url, IEnumerable<IOnDemand`
`68`	`68`	`/// <inheritdoc />`
`69`	`69`	`public void Start()`
`70`	`70`	`{`
	`71`	`+ if (IsRunning)`
	`72`	`+ return;`
	`73`	`+`
`71`	`74`	`var bgThread = new Thread(StartListen)`
`72`	`75`	`{`
`73`	`76`	`IsBackground = true,`