this.interval = interval; this.transport = transport; retransmitter = new Retransmitter(null, this, sched);
retransmitter = new Retransmitter(null, this);
    public AckSenderWindow(RetransmitCommand com, long[] interval, Protocol transport, TimeScheduler sched) {        retransmit_command = com;        this.interval = interval;        this.transport = transport;        retransmitter = new Retransmitter(null, this, sched);        retransmitter.setRetransmitTimeouts(interval);    }