Hello!

I'm wondering how to limit the TCP requests per client (per specific IP) in Java. For example, I would like to allow a maximum of X requests per Y seconds for each client IP. I thought of using static Timer/TimerTask in combination with a HashSet of temporary restricted IPs.

  private static final Set<InetAddress> restrictedIPs = Collections.synchronizedSet(new HashSet<InetAddress>());

private static final Timer restrictTimer = new Timer();

So when a user connects to the server, I add his IP to the restricted list, and start a task to unrestrict him in X seconds.

restrictedIPs.add(socket.getInetAddress());

restrictTimer.schedule(new TimerTask() { public void run() { restrictedIPs.remove(socket.getInetAddress()); }

}, MIN_REQUEST_INTERVAL);

My problem is that at the time the task will run, the socket object may be closed, and the remote IP address won't be accessible anymore...

Any ideas welcomed! Also, if someone knows a Java-framework-built-in way to achieve this, I'd really like to hear it.