Jetty websocket

import java.lang.String;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.servlet.http.HttpServletRequest;

import org.apache.wink.json4j.JSONObject;
import org.eclipse.jetty.websocket.WebSocket;
import org.eclipse.jetty.websocket.WebSocketHandler;


public class AlarmWebSocketHandler extends WebSocketHandler {

    public final Set<AlarmWebSocket> webSockets = new CopyOnWriteArraySet<AlarmWebSocket>();
    private String data;

    public AlarmWebSocketHandler() {
    }

    public WebSocket doWebSocketConnect(HttpServletRequest request,
            String protocol) {
        return new AlarmWebSocket();

    }

    public class AlarmWebSocket implements WebSocket.OnTextMessage {

        public Connection connection;

        public void onOpen(Connection connection) {
            // Client (Browser) WebSockets has opened a connection.
            // 1) Store the opened connection
            this.connection = connection;
            // 2) Add ChatWebSocket in the global list of ChatWebSocket
            // instances
            // instance.
            webSockets.add(this);
        }


        public void onMessage(String jsonRequest) {
            // Loop for each instance of ChatWebSocket to send message server to each client WebSockets.
            try {
                for (AlarmWebSocket webSocket : webSockets) {
            JSONObject response2 = DoSomethingWithJsonObj(jsonRequest);
                    if(response2!=null) {webSocket.connection.sendMessage(response2.toString());}
                        }
            } catch (Exception x) {
                x.printStackTrace();
                // Error was detected, close the ChatWebSocket client side
                //this.connection.disconnect();
            }

        }

        public void onClose(int closeCode, String message) {
            // Remove ChatWebSocket in the global list of ChatWebSocket
            // instance.
            webSockets.remove(this);
        }
    }
}

//This is an elaborated version of a method introduced in
//http://jansipke.nl/websocket-tutorial-with-java-server-jetty-and-javascript-client/