loss-monitor.cc

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 *  Engineering Group at Lawrence Berkeley Laboratory.
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#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/tools/loss-monitor.cc,v 1.18 2000/09/01 03:04:06 haoboy Exp $ (LBL)";
#endif

#include <tclcl.h>

#include "agent.h"
#include "config.h"
#include "packet.h"
#include "ip.h"
#include "rtp.h"
#include "loss-monitor.h"

static class LossMonitorClass : public TclClass {
public:
    LossMonitorClass() : TclClass("Agent/LossMonitor") {}
    TclObject* create(int, const char*const*) {
        return (new LossMonitor());
    }
} class_loss_mon;

LossMonitor::LossMonitor() : Agent(PT_NTYPE)
{
    bytes_ = 0;
    nlost_ = 0;
    npkts_ = 0;
    expected_ = -1;
    last_packet_time_ = 0.;
    seqno_ = 0;
    bind("nlost_", &nlost_);
    bind("npkts_", &npkts_);
    bind("bytes_", &bytes_);
    bind("lastPktTime_", &last_packet_time_);
    bind("expected_", &expected_);
}

void LossMonitor::recv(Packet* pkt, Handler*)
{
    hdr_rtp* p = hdr_rtp::access(pkt);
    seqno_ = p->seqno();
    bytes_ += hdr_cmn::access(pkt)->size();
    ++npkts_;
    /*
     * Check for lost packets
     */
    if (expected_ >= 0) {
        int loss = seqno_ - expected_;
        if (loss > 0) {
            nlost_ += loss;
            Tcl::instance().evalf("%s log-loss", name());
        }
    }
    last_packet_time_ = Scheduler::instance().clock();
    expected_ = seqno_ + 1;
    Packet::free(pkt);
}

/*
 * $proc interval $interval
 * $proc size $size
 */
int LossMonitor::command(int argc, const char*const* argv)
{
    if (argc == 2) {
        if (strcmp(argv[1], "clear") == 0) {
            expected_ = -1;
            return (TCL_OK);
        }
    }
    return (Agent::command(argc, argv));
}

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