return publish result: count of subscriber

VCommon.PubSub/Publisher.cs

@@ -8,10 +8,10 @@ namespace VCommon.PubSub
         {
         }
 
-        protected void Publish(string message)
+        protected long Publish(string message)
         {
             Logger.Trace($"{nameof(PubSub)}:{nameof(Publish)}", new { ChannelName, Content = message });
-            Conn.GetSubscriber().Publish(ChannelName, message);
+            return Conn.GetSubscriber().Publish(ChannelName, message);
         }
     }
 }