public int hashCodeForPacket(Packet packet) {
        if (packet.getElemTo() != null) {
            return packet.getElemTo().hashCode();
        }
        // This should not happen, every packet must have a destination
        // address, but maybe our SPAM checker is used for checking
        // strange kind of packets too....
        if (packet.getElemFrom() != null) {
            return packet.getElemFrom().hashCode();
        }
        // If this really happens on your system you should look carefully
        // at packets arriving to your component and decide a better way
        // to calculate hashCode
        return 1;
    }