current username checked && refactor && remove players in channel when they are more than 2

src/Mine/SeekerBundle/Topic/AcmeTopic.php

@@ -43,12 +43,17 @@ class AcmeTopic implements TopicInterface
         $user = $this->clientManipulator->getClient($connection);
         $userName = is_string($user) ? $user : $user->getUsername();
 
-        $topic->broadcast([
-            'userTopicId' => $connection->resourceId,
-            'channel' => $topic->getId(),
-            'user' => $userName,
-            'userCnt' => $topic->count()
-        ]);
+        /** if more user wants to connect than 2 to one channel */
+        if ($topic->count() > 2) {
+            $topic->remove($connection);
+        } else {
+            $topic->broadcast([
+                'userTopicId' => $connection->resourceId,
+                'channel' => $topic->getId(),
+                'user' => $userName,
+                'userCnt' => $topic->count()
+            ]);
+        }
     }
 
     /**