title: jetty 9 websockets onFrame event
body: <p>On older versions of jetty (7 and 8) we had an onFrame (<a href="http://download.eclipse.org/jetty/stable-7/apidocs/org/eclipse/jetty/websocket/WebSocket.OnFrame.html" rel="nofollow">http://download.eclipse.org/jetty/stable-7/apidocs/org/eclipse/jetty/websocket/WebSocket.OnFrame.html</a>) event for websockets. Is there an equivalent in version 9? They have WebSocketListener (<a href="http://download.eclipse.org/jetty/stable-9/apidocs/org/eclipse/jetty/websocket/api/WebSocketListener.html" rel="nofollow">http://download.eclipse.org/jetty/stable-9/apidocs/org/eclipse/jetty/websocket/api/WebSocketListener.html</a>) interface but there is no onFrame method defined.</p>
  
  <p>Thanks</p>