title: dont want to notify all members in play framework socket chat
body: <p>i am tottaly new in play framework web socket.
  i downloaded a application of chat from the <a href="https://github.com/playframework/playframework/tree/master/samples/scala/websocket-chat" rel="nofollow">https://github.com/playframework/playframework/tree/master/samples/scala/websocket-chat</a></p>
  
  <p>and i am learning it for the notifications in project. but the problem is that i am not understading the behaviour of the code. like in below code, i want to set the members whom twill recived the msg.<br>
  previusly <code>members</code> contatining all username of users that are in chat room, i modify it and set it to only one user "govind" but still all members are notifing,<br>
  simply i want to notify only some users</p>
  
  <pre><code>def notifyAll(kind: String, user: String, text: String) {
  members=Set.empty[String]+"govind"
  val msg = JsObject(
    Seq(
      "kind" -&gt; JsString(kind),
      "user" -&gt; JsString(user),
      "message" -&gt; JsString(text),
      "members" -&gt; JsArray(
        members.toList.map(JsString)
      )
    )  
  )
  chatChannel.push(msg)
  }
  </code></pre>
  
  <p>and what it does </p>
  
  <pre><code>sender ! Connected(chatEnumerator)
  self ! NotifyJoin(username)
  </code></pre>