class PacketBuffer {
    private Lock lock = new ReentrantLock();
    private Condition notFull = lock.newCondition();
    private Condition notEmpty = lock.newCondition();
    Queue<String> packets = new LinkedList<String>();
    public void insert(String guid) throws InterruptedException {
        //FIXME
        lock.lock();
        try {
            while(packets.size() == Define.bufferSize) {
                System.out.println("Warteschlange voll, kann "+guid+" nicht annehmen.");
                //FIXME
                packets
                if (++?? == ???) ??? = 0;
                ++count;
                notFull.await();
            }
            packets.add(guid);
            System.out.println(guid+" ist jetzt in der Warteschlange.");

            //FIXME
            notEmpty.signal();
        } finally {
             //FIXME
            lock.unlock();
        }
    }