hgpsrequesttable.cc

在Linux下做的QuadTree的程序

/* requesttable.h

   implement a table to keep track of the most current request
   number we've heard from a node in terms of that node's id

   Modified slightly from dmaltz' implementation of DSR

   $Id: hgpsrequesttable.cc,v 1.1.1.1 2000/08/28 18:40:22 jinyang Exp $
*/

#include "hgpsrequesttable.h"

HGPSRequestTable::HGPSRequestTable(int s): size(s)
{
  table = new HGPSEntry[size];
  size = size;
  ptr = 0;
}

HGPSRequestTable::~HGPSRequestTable()
{
  delete[] table;
}

int
HGPSRequestTable::find(nsaddr_t net_id) 
{
  for (int c = 0 ; c < size ; c++)
    if (table[c].id == net_id)
      return c;
  return size;
}

int
HGPSRequestTable::get(nsaddr_t id) 
{
  int existing_entry = find(id);

  if (existing_entry >= size)    
    {
      return 0;
    }
  return table[existing_entry].req_num;
}


HGPSEntry*
HGPSRequestTable::getHGPSEntry(nsaddr_t id)
{
  int existing_entry = find(id);

  if (existing_entry >= size)    
    {
      table[ptr].id = id;
      table[ptr].req_num = 0;
      table[ptr].rt_reqs_outstanding = 0;
      table[ptr].last_rt_req = -(RT_RQ_PERIOD + 1.0);
      existing_entry = ptr;
      ptr = (ptr+1)%size;
    }
  return &(table[existing_entry]);
}

void
HGPSRequestTable::insert(nsaddr_t net_id, int req_num)
{
  int existing_entry = find(net_id);

  if (existing_entry < size)
    {
      table[existing_entry].req_num = req_num;
      return;
    }

  // otherwise add it in
  table[ptr].id = net_id;
  table[ptr].req_num = req_num;
  table[ptr].rt_reqs_outstanding = 0;
  table[ptr].last_rt_req = -(RT_RQ_PERIOD + 1.0);
  ptr = (ptr+1)%size;
}