Banana-Coding.com - Java Knuddels Emulator

Quellcode

...

	private static final byte MAX_CONS_PER_MIN = 5;

	private HashMap<String, ArrayList<Long>> connections;

	public Server() {
		connections = new HashMap<String, ArrayList<Long>>();
	}

	private void listen() {
		ServerSocket listener;

		try {
			listener = new ServerSocket(port);
		} catch (IOException e) {
			e.printStackTrace();
			return;
		}

		System.out.println(String.format("Listening on port %d.", port));

		while (true) {
			Socket socket;

			try {
				socket = listener.accept();
			} catch (IOException e) {
				e.printStackTrace();
				continue;
			}

			String ip = socket.getInetAddress().getHostAddress();
			ArrayList<Long> cons = connections.get(ip);

			if (cons == null) {
				cons = new ArrayList<Long>();
			}

			long current = System.currentTimeMillis();
			cons.add(current);
			connections.put(ip, cons);

			if (cons.size() > MAX_CONS_PER_MIN) {
				int count = 0;

				for (long con : cons) {
					if (con > current - 60000) {
						count++;

						if (count > MAX_CONS_PER_MIN) {
							break;
						}
					}
				}

				if (count > MAX_CONS_PER_MIN) {
					try {
						socket.close();
					} catch (IOException e) {
						e.printStackTrace();
						continue;
					}
				}
			}

			Client client = new Client(socket);
			new Thread(client).start();
		}
	}

...