demarker.cc

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/*
 *                                                                     
 * Marker module for JoBS (and WTP).
 *                                                                     
 * Authors: Constantinos Dovrolis <dovrolis@mail.eecis.udel.edu>, 
 *          Nicolas Christin <nicolas@cs.virginia.edu>, 2000-2002       
 *                                    
 * $Id: demarker.cc,v 1.1 2003/02/02 22:18:22 xuanc Exp $
 */

#include <string.h>
#include <queue.h>
#include "demarker.h"
#include "tcp.h"

static class DemarkerClass : public TclClass {
public:
    DemarkerClass() : TclClass("Queue/Demarker") {}
    TclObject* create(int, const char*const*) {
        return (new Demarker);
    }
} class_demarker;

Demarker::Demarker() {
    q_ = new PacketQueue; 
  
    last_monitor_update_=0.0;
    monitoring_window_ = 0.1;
    
    for (int i=0; i<=NO_CLASSES; i++) {
        demarker_arrvs_[i]=0;
        arrived_Bits_[i] = 0;
    }
  // Binding arrays between cc and tcl still not supported by tclcl...
  if (NO_CLASSES != 4) {
    printf("Change Demarker's code!!!\n\n");
    abort();
  }
  bind("demarker_arrvs1_",    &(demarker_arrvs_[1]));
  bind("demarker_arrvs2_",    &(demarker_arrvs_[2]));
  bind("demarker_arrvs3_",    &(demarker_arrvs_[3]));
  bind("demarker_arrvs4_",    &(demarker_arrvs_[4]));
}



int Demarker::command(int argc, const char*const* argv) {
    if (argc == 3) {
        if (strcmp(argv[1], "trace-file") == 0) {
            file_name_ = new(char[500]);
            strcpy(file_name_,argv[2]);
            if (strcmp(file_name_,"null") != 0) {
                demarker_type_ = VERBOSE;
                for (int i=1; i<=NO_CLASSES; i++) {
                    char filename[500]; 
                    sprintf(filename,"%s.%d", file_name_,i);
                    if ((delay_tr_[i] = fopen(filename,"w"))==NULL) {
                        printf("Problem with opening the trace files\n");
                        abort();
                    }
                }
            } else {
                demarker_type_ = QUIET;
            }
            return (TCL_OK);
        } else if (strcmp(argv[1], "id") == 0) {
            link_id_ = (int)atof(argv[2]);
            return (TCL_OK);
        } 
    }
    return Queue::command(argc, argv);
}



void Demarker::enque(Packet* p) {
    q_->enque(p);
    if (q_->length() >= qlim_) {
        q_->remove(p);
        drop(p);
        printf("Packet drops in Demarker of type:%d\n", demarker_type_);
    }
}



Packet* Demarker::deque() {
  Packet* p= q_->deque();
  if (p==NULL) return p;
  
  hdr_ip*  iph = hdr_ip::access(p);
  hdr_cmn* cm_h = hdr_cmn::access(p);
  double  cur_time  = Scheduler::instance().clock();

  int cls = iph->prio_;
  if ((cls<1) || (cls>NO_CLASSES)) {
    printf("Wrong class type in Demarker-deque (S=%d, D=%d, FID=%d, Class=%d)\n",
       (int)(iph->src().addr_), (int)(iph->dst().addr_),
       iph->fid_, iph->prio_);
    
    fflush(stdout);
    abort();
  }
  demarker_arrvs_[cls] += 1.;

 
  if (demarker_type_ == VERBOSE) {
    // Write end-to-end delay of packet in per class trace file
    if (cur_time > START_STATISTICS) {
      double pack_del = cur_time - cm_h->ts_arr_;
      cm_h->ts_arr_=0;    // This stupid thing is required..
      // print arrival time and delay
      fprintf(delay_tr_[cls], "%.5f %.5f\n", 
          cur_time, pack_del);
    }    
 
    return p;
  }
  
  return p;
}

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